Abigail's 18th April 14, 2005...early evening in Victoria... Inside our two-story house on the East Side of Victoria, my sister and I were in the dining room along with Melissa and Chad Jr. sitting in his booster seat at the table with Brian and Brianna joining us there. At one end of the table, where I would normally sit at dinnertime, Abigail was seated with a birthday cake with 18 lit candles in front of her. Today was Abigail's 18th birthday, she was now officially an adult under Kapernian law. The celebration we had for her was private, just my sister and I, along with the son Mel-Mel and I produced and Abigail's siblings. A party was planned for that weekend that would include Abigail's friends, but that wouldn't be for a couple of days. Today was meant to be strictly a family affair. We did the traditional birthday celebration for Abigail, singing "Happy Birthday" and having her blow out the candles while making a wish. Then, it was time to have some cake and ice cream. Naturally, being a young pup, Chad Jr. was more than eager to have some cake and ice cream, though at least he was old enough to eat it now without getting it all over his face. Melissa and her littermates had gifts for Abigail, as did me and Charlene. Melissa got Abigail a Yin/Yang necklace in diamond and emerald, symbolizing the relationship they had as sisters. Brian and Brianna (being much like Charlene and I) went in together on their gift to Abigail and bought their younger sister her very own new car...a metallic blue one with a retractable roof. Charlene and I didn't go to the same extreme as Abigail's older siblings, but we got her something that we thought she'd like. Thanks to our connections with the Mason twins, we were able to procure an I.E. Evolution console for Abigail, as well as several launch titles for the console, several months before they were to be released for public sale. In addition to the gifts she received, as per Kapernian tradition upon becoming an adult, she was allowed to have one wish fulfilled (as long as it was something that was within reason and could easily be achieved). This led to Abigail having a conversation with Melissa after the celebrations were done. Brian and Brianna went into another part of the house, possibly to have a little bit of alone time together since they went into one of the spare bedrooms and locked the door from the inside. Meanwhile, I was busy getting my son cleaned up after he was finished eating. He may not have been as messy of an eater as he was when he was a toddler, but that didn't mean he didn't still get some cake and ice cream onto other parts of his nuzzle. Following this, I brought Chad Jr. to the living room and watched some cartoons with him in my lap, the kind of cartoons that I used to watch when I was a young pup. I stayed with him for about an hour until it was time for him to head off to bed, carrying my young son to his bedroom to lay him down for the night. Once he was tucked into bed, I gave him the plush raichu and plush vulpix Melissa and I gave to him on his last birthday, nuzzled my son gently, then made sure to turn on the night light, casting a soft blue glow in the room. Melissa came in soon after to kiss our son's nose and stay by his side until he was asleep, gently rubbing the top of his head a little to help relax our little pup. It took a few minutes, but Chad Jr. would soon fall asleep, clutching his raichu plushie in one arm and the vulpix in the other. Once Chad Jr. was asleep, Melissa came out of the bedroom and immediately went over to me. "By the way, I didn't want to tell you this while Chad Jr. was still awake, but my sister wants to talk to you and Charlene", Melissa told me softly, making me scratch my head a little. "Really? What about?", I asked softly, trying to keep my voice down so as not to disturb our son's rest. Melissa touched my nuzzle and rubbed it lightly. "It's best if you ask her for yourself. Anyway, she should be out in the backyard, that's where I last saw her", Melissa commented before placing a kiss on my cheek. "I'll be in our bedroom when you're done with Abigail", she mentioned before heading to our master bedroom to relax a bit. By now, Brian and Brianna had gone home, no doubt to do what Charlene and I often did together, which just left the four of us in the house. I found Charlene in the living room when I came downstairs, going over to the couch and placing a hand on her shoulder. "C'mon Sis, let's go see what Abigail wants", I told Charlene, getting a puzzled look from my sister. "What do you mean 'what Abigail wants'? No one told me anything about this", she replied as I shrugged. "To be honest, I don't know what Mel-Mel meant when she told me, but she did mention that Abigail wanted to see both of us. So, let's go find her", I told Charlene, eventually getting my sister to get up from the couch before we went out into the backyard. The backyard consisted of a brick patio with a table, chairs, and umbrella set up for outdoor eating, along with a gas-powered grill, with wood fencing around the perimeter of the backyard, painted white and standing about six feet high. Abigail was sitting at the table by herself, looking over at us once we came outside. "There you two are...I've been waiting for you!", she commented when Charlene and I stepped out onto the patio. Charlene and I walked together, hand-in-hand, going towards the table set-up and sat next to Abigail in two separate chairs. "Mel-Mel told us you were out here...she mentioned that there was something that you wanted to talk to us about", I commented in a soft tone as Abigail began to blush a little after I spoke. "Well...you know how I'm supposed to get one wish for my 18th birthday, right?", Abigail started to explain as Charlene and I curiously listened. Because Charlene and I were born and raised on Earth, we had no knowledge of the birthday wish first-hand, we had to learn of it through Melissa and her siblings. However, we knew what she was talking about. "Yes...what about it?", I asked, still holding Charlene's hand while she sat in the chair next to me. Abigail started to touch her fingers together while blushing, seeming a bit shy and nervous, but soon telling us what her wish was. "Well...I was kind of hoping that...umm...", she started to reply, her cheeks turning bright pink while she nervously looked at us, her green eyes seeming to glimmer a bit. Before she could say anything else, Charlene interrupted her train of thought. "I know what you want...you want us to have sex with you, am I right?", Charlene replied, catching Abigail by surprise. She blushed even more, but had a playful smile on her cute face. "Well, if it's OK with you two", she answered shyly, still seeming nervous about asking us for this. At first, I was surprised when Abigail brought this up, but I soon thought back to what happened a few years earlier and what I said that I would do if she didn't have a boyfriend by her 18th birthday. That being said, there were still some issues. Charlene seemed surprised that Abigail would mention wanting to have sex with her and replied before I could say anything. "Abigail, I didn't expect you to be interested in other females", she commented, causing the birthday mousette to blush some more. "I've been curious to try it for a few years now", Abigail replied while blushing, feeling slightly embarrassed about admitting it. "Ever since you and your brother moved in and I've seen you naked I couldn't help getting a little turned on", she added while talking to Charlene. Charlene knew first-hand what Abigail was going through. She experienced the same thing back in high school with Valerie. The only difference was that this time around, Charlene was the older and more experienced female, and much like how Valerie was to her, Charlene felt willing to fulfill Abigail's curiosity. "Mmm...well, if that's what you want, I'll be more than happy to indulge you", Charlene replied to Abigail in a playful tone. Abigail seemed excited, but soon turned her attention towards me, having a glimmer in those green eyes of hers. "What about you? Would you be interested in filling my mouse hole?", Abigail asked, feeling a bit more bold now as the thought of seeing my twin sister and Abigail having sex started to affect me sexually. I felt my foxhood start to come out of its sheath as I looked at my sister-in-law. "It certainly is tempting", I started to reply, thinking about how it might feel to do Abigail myself. "However, I don't know about this, it might seem awkward having sex with my wife's younger sister. Plus, what would happen if you ended up getting pregnant from me. How would Mel-Mel react to that?", I added as Abigail seemed determined to have sex with me, getting up from her chair and going over to me, sitting down in my lap. "Please? I really want to feel you in me. I don't mind at all letting you fill me up like you do to my sister", she replied, brushing a hand along my cheek. "Besides, you promised that you'd do this for me if I didn't have a boyfriend by the time I was 18, remember", she added a moment later, once again bringing up what I told her previously. "You're right...I did promise that", I replied, feeling as if I should fulfill the promise I made to Abigail about 3 years ago. "Still, I'm a bit worried about what might happen if I cum inside you", I told Abigail in a soft tone, feeling my foxhood growing more erect while she sat in my lap and brushed a hand along my cheek. Abigail sweetly chuckled, then kissed my lips. "Mmm...I wouldn't mind getting pregnant from you one bit", she answered happily as her words made me feel a bit more nervous...that is until she mentioned something else. "However, as much as I would love to have your pups, I know that you love Mel-Mel, so I'm not going to force breeding with me upon you. I've had my yiffberries and my tubes are capped, so it should be safe for you to fill me like you do with her", she added. Hearing that she was on contraception did relieve my worries and I felt my foxhood grow stiff more rapidly as Abigail started to move around a bit on my lap, her crotch touching my own with only our clothes separating us from our genitals touching one another. "You'll find someone of your own someday, Abigail. I'm sure there would be plenty of males who would like to be your boyfriend", I assured her in a soft tone, touching one of her cheeks. "In the meantime, you and I can have a siblings-with-benefits type of relationship. Just don't be coming to me for sex too much though, otherwise your sister might get jealous", I replied. Abigail chuckled again and touched her nose to mine. "Can you do what you do for Mel-Mel to me?", she asked curiously, referring to the many times Melissa and I have been stuck together in a copulatory tie...including one time where Abigail walked in on us during our union. "Since you're the birthday girl and it is your 18th, I suppose I could do that for you. However, don't expect me to do this every time we have sex, OK?", I answered, preferring to save the tie for Melissa and my sisters. "That seems fair enough", Abigail replied while she was still in my lap, letting her crotch rub against the bulge in my pants a little while doing so. Meanwhile, Charlene looked at the two of us and chuckled a bit. "Why don't I let you two have a little one-on-one time while I watch", Charlene suggested before turning her attention to Abigail. "Then when he's done filling you, I'll lick your pussy for a bit while I let my brother take me", Charlene added, seeming to want me inside her as well. "We can also have some time to ourselves later on after he's done with both of us", she told Abigail while brushing one of her soft mousette cheeks. "Mmm...OK...sounds good enough to me", Abigail replied before I felt my sister-in-law kiss me on the lips in a happy and playful manner, still rubbing her crotch along my bulge. "So, are you ready for me? Because I'm already good and wet on the inside and I'm eager to see what you give to my sister", she added in a playful tone, looking at me with a bit of a glimmer in those emerald-green eyes of hers. "Mmm...yeah...I think so", I replied, feeling my foxhood pulse inside my pants. "Should we head inside first, or do you feel like doing it in the yard?", I asked curiously, wondering what Abigail preferred. She brushed a hand along my cheek while her other hand went to my bulge, caressing it lightly. "Let's go inside...I don't really feel like doing it in the grass", Abigail replied before finally getting off my lap. "Should we go to the 'play room'?", I suggested a moment later, thinking that it would be best for us since it was down in the basement where we wouldn't disturb Chad Jr. Abigail nodded and soon reached her hand out for my own. "I just hope Mel-Mel isn't practicing her routine in there, otherwise it might get awkward", Abigail replied, knowing that Melissa sometimes used the 'play room' to practice her routines and new skills for her job at The Mouse Hole. "Yeah, that would be awkward", I answered, thinking about what might happen if Melissa were to see me putting my foxhood into her little sister while she was busy practicing her routine, especially since she normally practiced those moves with me. After this, I got up from the chair, followed by Charlene, with me taking hold of Abigail's hand. We walked back into the house together, going towards the basement stairwell, heading down into the lower level of the house. The basement was mostly nothing to write home about, containing the usual appliances (furnace, hot water heater) as well as our washer and dryer. There were two other rooms in the basement. One was a certified "safe room" with a heavy steel door to be used as a shelter in case of emergency. The other was the aforementioned 'play room'. The three of us went to the play room, which had a keypad lock on it, requiring a certain combination to get access to it. We went with the combination lock since we felt it was the safest way to keep Chad Jr. from discovering what his parents do in private. After putting the combination in, I opened the door and turned on the lights using the master light panel near the door. We had special lighting installed in the room that could be adjusted to fit any sort of mood. The "play room" had a soft carpeted floor with a decent amount of open space, which would make it easier for me to properly turn a tie in there. At one end of the room, there was a stripper pole and a small circular stage, with a comfortable couch directly in front of it. This is where Melissa would sometimes give me private performances...and often a bit more than that. The other end of the room had a full-sized bed in it, used for occasions where we wanted sex in bed. There was also a small bathroom connected to the play room, with a shower stall big enough for two inside, for cleaning up after we were finished. I had been in the room many times with Melissa and a few times with Charlene in the past, but this was the first time Abigail had been inside. She continued to hold my hand while Charlene made sure the door was firmly closed behind us, with the lock engaging a second or two later. "What setting should I put in for the lights?", Charlene asked curiously, standing over by the lighting control panel. "Hmm...how about a nice rose-colored setting. Oh, and have the disco ball come down for some added ambience", I suggested to my sister while she proceeded to program the lighting, causing the room to change color from a 'natural sunlight' to a more rosy hue. In addition, a small disco ball came down from the ceiling, with lights reflecting off the mirrors on the ball, adding a "glittery" touch to the room. Once Charlene was finished with the lighting, she came over to me and kissed my lips. "I'll go over to the bed and watch you two for a while. Just make sure you don't spend too much energy on Abigail...I want some too!", Charlene replied before starting to take off her clothing so she could get in bed and enjoy our show. This is when I turned my attention to my sister-in-law and touched her tush with one of my hands. "So, is the birthday girl ready to get her wish?", I asked curiously, my foxhood still fully erect inside my pants, throbbing as it seemed to want to come out. Abigail playfully chuckled and rubbed the bulge with her hand. "Mmm...yeah...I'm more than ready to have you inside me", she replied eagerly before we let each other go long enough so we could each take off our clothing. It felt good to remove my pants and boxers, allowing my maleness to freely throb as it stood erect with precum already appearing at the tip. Abigail saw this while she was removing her clothing, having her bra and panties still on. "Oooh, very nice...I can see why my sister likes you!", she playfully commented, making me blush a little at her remark. Soon after this, Abigail began to remove her lingerie, beginning with her top while facing towards me. I was impressed with Abigail's bosom, being about the same size as her sister's rack with nice pink and puffy nipples to go along with them. The sight only helped to make my member throb and twitch for her. "Do you like them?", she asked sweetly, squishing her breasts together in a playful manner. "Mmm...why yes, they are rather nice", I replied as I couldn't help wondering how it might feel to have my foxhood squished in between Abigail's breasts at some point. After all, Mel-Mel had already done so for me in the past. However, Abigail was only beginning to show off, she soon started to lower her panties, exposing her vaginal folds for me to see. They already seemed to have a bit of a glaze on them from her vaginal sauce, showing that she was ready and willing to have my foxhood inside her. Meanwhile, Charlene was relaxing on the nearby bed, naked and starting to finger herself a little. She likely thought that Abigail was as sexy as I did. After she undressed, Abigail walked over to me and placed her arms around my back, bringing her pussy to meet with my foxhood. I started to feel it rub along the underside of it, with her folds feeling warm to the touch and her vaginal sauce beginning onto my length. Her touch only helped to make me throb even more, with a spurt of precum launching from my tip, hitting Abigail's belly. She chuckled playfully and touched one of my cheeks, with me looking down a bit at her. "I take it this means that you like how I feel down there", she playfully commented, still rubbing her folds along the underside of my pole in a slow manner. Another spurt of precum left my tip, hitting Abigail's lower belly as she rubbed against me. "Mmm...yeah", I replied, trying not to seem too eager to mate with her, wanting to let Abigail decide when she was ready to take me inside her. There was something that I thought of during this time, however. "Abigail...I hope you don't mind me asking, but is this your first time with a male?", I asked curiously. Abigail chuckled and touched my cheek some more. "Mmm...it's my first time with a male who means something to me", she replied, suggesting that she had sex previously. "Obviously I would prefer to think of you as something more than my brother-in-law, but I don't think Mel-Mel would appreciate it too much", she added. I promptly replied to Abigail as she grinded against my maleness, touching her cheek with my hand. "It's best for us to keep our relationship as 'siblings-with-benefits', Abigail", I commented softly as her touch made my foxhood twitch right before a stronger spurt of precum left my tip, reaching Abigail's bellybutton. She felt my member move and the warmth of my precum touch her body, making her grow even more aroused as her pussy lips became more moist and warmer to the touch. "Oooh...it looks like my 'big brother' is eager to play with his 'little sister'!", she cheerfully replied before I felt Abigail kiss me on the side of my nuzzle, then move away from me. She only did this so she could get down on the floor in front of me, getting on her hands and knees while raising her backside towards me, presenting herself. "Come play with me, 'big brother'!", she mentioned while shaking her butt at me, showing off her eagerness to accept my foxhood in her mouse hole. "Mmm...of course!", I replied, dropping down to my knees before coming up behind Abigail, using one of my hands to guide my length to her vaginal folds. I let my tip touch the space between her outer lips, positioning it so that it met with her opening, feeling the warmth radiate from her reproductive tract. Meanwhile, my sister was watching all this, still touching herself some while murring with delight. "Make sure to give her a healthy filling now", Charlene mentioned, likely wanting me to creampie Abigail so she could eat out the mixture of my seed and her sauce while I gave her a filling later on. With the way that I felt at that moment, it seemed likely that I would be able to give Abigail plenty of cum to satisfy her desires. With that in mind, I started to push inward, feeling my tip sliding through Abigail's mouse hole as my hands went to her hips, grabbing onto them. She seemed tighter than Melissa, likely because she wasn't as experienced with sex as Mel-Mel was, plus the fact that Melissa already had Chad Jr. That being said, Melissa's mouse hole seemed warmer to the touch than Abigail's, though Abigail's passage was still quite warm to me. I moved in slowly, wanting Abigail to feel every inch of my member as it entered her, already spitting precum against her cervix. This made her pussy spasm inward around my length, giving it a squeeze as I tightened my grip around her hips a little. "Ahh...don't get me too wound up now, Abigail. You don't want me to cum before I even have a chance to knot you", I replied in a somewhat joking manner. Abigail chuckled a little as my knot kissed against her vaginal lips while my member pulsed against her insides, making her feel happy and excited. "Mmm...I guess I'm just happy to have you in me", she replied while my hands held her hips, gripping them firmly as I began to move, going slowly to start. "Mmm...you have a nice mouse hole, Abigail", I replied while humping her, moving at a modest pace as her vaginal walls began to massage my length, her canal providing plenty of moisture to make it easy for me to move inside. Charlene continued to touch herself while watching us, placing a couple of her fingers into her vixen hole. "Mmm...you always seemed to have a thing for mouse girls...even before you and Melissa met", Charlene commented. "Mmm...well, you know how much I like cute things, Sis", I replied while enjoying Abigail's tight passage, feeling her walls quiver and spasm around my foxhood while it moved through her. "Mmm, and not just mousettes either", I added in thought, thinking back to my feelings about cute bunny girls. However, I soon put those feelings off to the side and focused on Abigail, continuing to deliver my member to her pussy while covering her like I would her sister. As I did this, I increased my speed a little, letting my bulb kiss against Abigail's outer folds with each inward motion while a soft squishing sound could be heard. Abigail moaned with pleasure and leaned back towards my member a little, acting in a manner similar to how Charlene or Melissa would when I was in this position. "So, how are you feeling, birthday girl? Are you enjoying my 'present'?", I asked her in a playful manner, sensing her pussy tighten around my length, giving it a squeeze and making me yip briefly. "Oooh, it's just what I wanted!", she answered in an equally playful tone, causing me to blush a little at her remark. "You feel so warm and thick inside me...it's no wonder why my sister loves you!", Abigail added, causing me to blush some more. "Mmm...I'm sure Mel-Mel loves me for more than my foxhood, Abigail", I replied before I decided to give the back of her neck a slow and warm lick with my tongue. She gasped when I did this, but soon moaned with delight, tightening her grip on me a bit more while I felt a fresh gush of her juices wash over my shaft. "Ahh...lick me some more! I love how warm your tongue feels against my neck!", she replied. "Mmm...alright, but just because it's your birthday", I answered promptly, going back to licking her neck slowly while delivering my member to her mouse hole, starting to move from side-to-side a bit to grind my knot against her vaginal lips in preparation to insert it. From her position, Charlene continued to watch me hump Abigail, seeing me move faster as I became more aroused, causing my twin sister to lick her chops and murr excitedly. I could tell that she was getting eager for a filling of her own, but she would still have to wait a bit before she got her turn. In the meantime, I kept plunging my eager foxhood into the barely legal mousette, feeling Abigail's tight folds massage my length rather nicely while becoming warmer to the touch from the rubbing. My knot continued to press against her outer lips with each inward motion, pushing a bit harder against them as I got closer to knotting her, feeling a healthy dose of my seed building inside my balls. Abigail's passage lacked the subtle electric charge that Melissa's pussy had when we had sex...even when she was in her normal form, but the tightness of the mouse hole was enough to arouse me. "Mmm...how are you doing now, birthday girl? Do you feel ready for your cream filling?", I asked her curiously, sensing my climax growing near. She leaned back towards me, helping to press my knot against her outer lips while her tail started to coil around one of mine. "Ahh! Yes! Fill me! Give me what you give to my sister!", she exclaimed as I felt her insides suddenly spasm around my member, giving it a hard squeeze right before a gush of her feminine goo rushed through her passage, soaking every part of my foxhood. "Well, since you put it that way...", I playfully answered my sister-in-law, giving one more inward push to send my knot into her mouse hole. After this, I let out a bit of a growling murr while clinging tightly to Abigail's hips and let my seed fly. My load left my foxhood in a steady stream, flowing deep into the mousette and starting to pool in her uterus, warming it from the inside. As this happened, my knot began to grow while she tightened around it, beginning to lock us together. "Ahh...yes! No wonder why my sister is in love with you!", Abigail exclaimed while I filled her, causing me to blush at her remark. "This is just a sample of what I can do, Abigail. Remember, I can change into other forms...some of them are even bigger and more productive than my current form", I told her while I passed my seed onto my sister-in-law, now feeling my knot firmly stuck inside her vaginal canal. She chuckled and started to give my swollen knot a bit of a tug. "Can you show me?", she asked curiously, wanting to see more. I blushed some as the stream of cum inside Abigail's passage slowed to periodic spurts in preparation for the tie. "I think I'd rather save those for your sister, Abigail", I replied, about ready to dismount her to complete our union. "Mmm...what about me?", Charlene mentioned from her position on the bed, still watching us have sex. I rolled my eyes a bit at my sister's remark, surprised she'd even say something like that. "You know exactly what I meant about that, Sis!", I answered, feeling slightly annoyed but getting a playful chuckle out of Charlene to my response. "Mmm...anyway, I suppose I should finish what I've started", I soon mentioned, turning my attention to Abigail once more, releasing my grip on her hips and soon turning the tie with my sister-in-law. She gasped while I turned the tie, doing her best to tug on my swollen bulb to keep it from coming out, while also helping to milk more of my cum from my balls as I enjoyed the gentle tugging sensation. Then, after a few moments, Abigail and I were joined in the same manner as I often was to Charlene or Melissa, leisurely pumping her mouse hole with more of my seed. "Mmm...now you know what it feels like when I do this with your sister", I commented to Abigail, looking back at her while she looked back at me, blushing and smiling. "Ohhh...this is the best feeling I've had in my life!", Abigail replied as I gradually filled her mouse hole with my seed, still feeling her insides holding and tugging at my swollen bulb. "Makes me wish that I could have you as my boyfriend even more!", she added, causing me to blush at her remark. "I know you want me, Abigail. However, you're still young and have your whole life ahead of you", I replied. "You'll find someone of your own soon enough, but until then I'll help you out a little", I added as I suddenly felt a tug on my knot, causing me to yip. "That said, it feels awfully good to be joined with you like this", I commented, getting Abigail to chuckle a little. "Mmm...stay inside me as long as you'd like. Fill me with your warm and tingly cream, just like you do with Mel-Mel", Abigail replied in a loving tone. "Mmm...no problem, birthday girl", I answered back, slowly passing more of my seed onto Abigail, still feeling her tightness milk my balls rather effectively, all while my sister watched us do it. The union between Abigail and I kept going for about a half-hour, with my sexual urges slowly diminishing over that time and the churning in my balls coming to a stop. Then, once I had finished planting my load in my sister-in-law, my knot deflated and I was able to pull free, leaving everything I pumped into her behind. I felt warm and relaxed after pulling out, my shaft covered in a glaze of her sauce and my cum mixed together, all while Abigail's pussy started to ooze with some of my leftover cum. I knew Charlene would want her turn next, but it would take me a little while to get aroused again. After I pulled out of her, Abigail turned over so she was on her back, keeping her legs spread open and showing off the creamy filling that oozed from her vaginal entrance. She started to touch herself a little, massaging her clitoris a bit while she had her pussy facing me as I went to sit down for a bit. "I feel so warm and tingly inside!", she commented while touching herself, making me blush as I watched her masturbate and continue to drip with my leftover seed. Meanwhile, Charlene decided that she was becoming sick and tired of watching and wanted to get involved. She got off the bed and moved towards where Abigail was, having something else in mind for her. "Well, allow me to show you what I can do", she mentioned playfully before getting down on all fours and starting to go down on Abigail, all while I watched. Charlene's warm and moist vixen tongue started to lap at Abigail's outer lips, beginning to gather the creamy filling that bubbled from the well-filled mouse hole, allowing my sister to savor the blend of my cream mixed in with a bit of the birthday girl's vaginal nectar. As my sister was busy going down on Abigail, I watched her present her own rear end to me, her tails draped off to one side, proudly displaying her pink pussy lips to me. My sister looked aroused, with a bit of her own sauce glazing those outer folds of hers, with Charlene taking things further by moving one of her hands down to her lips, spreading them apart so she could show off what was between them. I saw Charlene's vagina twitch as it stared back at me, convulsing inward briefly before relaxing, doing so several times. This was her way of telling me that she was eager to have me do what I did to Abigail to her. Soon, my thoughts started to focus more on Charlene, thinking back to everything we've done together and how it felt when I was joined with her in a copulatory tie. It was enough to help me get back in the mood for sex as I felt my foxhood grow erect once more and the churning begin to return to my balls. "Mmm...yes...don't stop now, Sis. I'm just getting warmed up!", I commented while growing horny for her, still watching Charlene lapping at Abigail's cum-filled mouse hole. Meanwhile, Abigail moaned and squirmed from my sister's licking, feeling her outer folds and clitoris being tickled by my sister's tongue. Charlene was doing her best to lap up the creampie that continued to ooze from Abigail's opening without dipping her tongue into the mousette's flower. She seemed to be saving that for when she felt me inside her own pussy. The display before me continued to trigger my sex drive, my maleness soon reaching full arousal once more and start to drip with precum. I didn't feel like waiting any longer to get involved, so I quickly went over to my sister from behind, covered her and placed the tip of my member at her vaginal lips. She briefly stopped licking at Abigail's pussy when I did this. "Oh! Looks like someone's ready to play with his sister!", she mentioned in a playful tone, just as I started to let my foxhood slide into her hot and moist vixen folds, moaning with pleasure along with Charlene as it happened. Charlene's passage was about as tight as Abigail's, but her vaginal walls squeezed my member a lot more and her canal felt a lot warmer. As such, I felt a spurt of precum leave my tip, hitting Charlene's cervix and getting my sister to chuckle. "Mmm...don't get too excited now", she playfully commented as I stopped pushing in when my knot kissed her outer lips and gave Charlene a playful lick along the back of her neck. Then, I started to hump my twin sister, moving at a moderate pace as her tightness began to massage my pulsing length and my knot kissed against her folds every time I moved inward. Now that she had me inside her, I watched as Charlene went back down on Abigail, being a bit more 'aggressive' with our sister-in-law, lapping her tongue more readily against Abigail's folds. The birthday mousette began to blush and moan with pleasure, squirming some more as she felt my sister's tongue tickle against her sensitive outer folds. I did my best to focus my attention on Charlene, feeling how she spasmed around my foxhood and sensing her warmth and moisture surrounding me, adding to the glaze that already covered my length from mating with Abigail a little earlier. I enjoyed my sister's tight and hot vixen hole, moving in and out of it at an excited pace, already starting to let my knot bump and grind against her while shifting my weight from side-to-side. I felt my foxhood throb against Charlene's passage, spitting more precum far into her canal, glazing her cervix and making it begin to quiver. Meanwhile, Charlene was trying her best not to become too excited while both receiving my length and giving Abigail oral sex, letting her tongue go deeper into Abigail's mouse hole, gathering the mixture of cum and vaginal sauce that was contained within. She let out an excited murr, clearly enjoying being in the middle of a threesome, lapping at Abigail's "flower" like a hummingbird gathering nectar. Abigail panted and moaned constantly, her toes curled and her ears standing up straight, feeling the ripples of warmth and pleasure down around her folds. The inside of her canal spasmed regularly, pushing out a bit more of the goo that I injected her with a bit earlier while mixing in her own sauce along with it, much to Charlene's delight. As for me, I kept my focus on Charlene's pussy, feeling the desire to plant another load in my twin sister growing rapidly as my balls felt heavy with seed. My knot kept bumping and grinding against Charlene's folds each time I pushed inward, now humping her at full speed while I held her hips firmly. Charlene's vixen hole dampened and became hotter to the touch as her arousal increased, making it a lot easier for me to hump her vigorously, especially with her starting to lean back towards my knot a little. With the desire to cum for Charlene growing, I closed my eyes and thought about our future, sensing the growing heat around my pole, making me wonder how it would feel to put pups inside her womb. We both wanted them, but we weren't quite ready to give it a try. Still, with the way I felt my sister grabbing at my member as I moved through her vixen hole, it would seem as if she was thinking the same thing I was. As my climax neared, Charlene pulled Abigail in closer to her mouth and became more 'aggressive' with eating her out, pushing her tongue far into the birthday mousette's canal, reaching her more sensitive parts. This caused Abigail to squeal with excitement as her insides convulsed around my sister's tongue, bringing about a powerful climax, just as my bulb passed through Charlene's entrance. My sister let out a playful growl, sensing the wave of Abigail's nectar rush through the mousette's passage, getting onto and into her mouth. If that wasn't enough, I clutched Charlene as tight as I could and let my own climax hit, sending a strong gush of my seed deep into her, splashing against her cervix and pooling in her uterus, all while I felt my knot growing large in her vaginal passage. Naturally, her vaginal walls tightly hugged my bulb as it grew, making sure that it would stay in place as we engaged in yet another "dress rehearsal" for creating our own family. While I waited for my bulb to grow, I leaned over my sister's shoulder and watched as she pulled away from Abigail's moist pussy, her mouth covered in a glaze of Abigail's sauce. "I take it that you enjoy being in the middle like this", I commented, still spurting seed into Charlene's passage. Her vaginal walls suddenly clamped my knot tighter, making me yip briefly. "What would make you think that?", she playfully answered before I gave Charlene a lick along her cheek just as I was about to turn the tie with her. Seconds later, Charlene and I were joined in the traditional vulpine way, with me slowly planting more of my cream into her reproductive tract, and her tugging on my swollen knot to help milk it out of me. Abigail, after climaxing for Charlene, rested on the floor, her pussy glazed with a thick layer of her juices and her vaginal opening quivering a little from the afterglow of her orgasm. Charlene noticed this as I was tied to her and put a finger inside the birthday mousette's hole. "Looks like the birthday girl wants some more!", she commented while touching Abigail, making our sister-in-law squirm and moan a little. "I don't think I can go another round after this, Sis. Not for a while, anyway", I replied, feeling Charlene milking my balls rather effectively, making it seem like it would be hours before I'd be interested in sex again after I pulled out. Charlene chuckled a little, then made her vixen hole tug on my swollen knot again, making me yip. "You don't have to worry, I can take care of her. Just concentrate on filling me with as much of your warm and tingly seed as you can", Charlene mentioned. We stayed like this for about a half-hour, with Charlene holding and tugging my bulb as I filled her while she was busy playing with Abigail a bit more, fingering and touching the birthday mousette. Slowly, my sex drive waned and I started to relax, my knot beginning to shrink back to normal as the last of my fresh seed left the tip of my foxhood. I felt a bit tired after doing this twice in a relatively short amount of time, but also rather warm and satisfied, my member coated in another thick glaze of vaginal sauce with a bit of my cream mixed in. A few minutes later, I was able to pull free from Charlene, leaving my payload behind in her vixen hole. Most of my load stayed in her pussy, but a little did trickle back out after a few moments. She stayed on all fours after I pulled out, her tails still off to one side, as if she were deliberately showing off what I had done to her. Meanwhile, I felt my foxhood relax some more, now semi-soft as it got ready to go back into my sheath as I moved away from Charlene and had a seat on the floor not far from where the two females were. "Maybe I'll just watch the two of you for a little while", I commented, wanting to relax after mating with my sister. To be continued, in a future bonus scene...