“Hey Mom, you’re really good at baking, do you think you could ever be in one of these baking competitions?” I asked looking up at my mom. My head was in her lap, we were on the couch doing what we love on a wednesday night: being lazy on the couch and watching baking shows. 
   “I don’t know, my baking is more of a hobby, I don’t think I could have what it takes to compete like that.” She ran her fingers through my hair. “Maybe we can get some of the mothers together and we can have a competition like that one day.” 
   My tail started to wag, “I think that would be pretty cool.” As we laid there, watching a sheep woman make a tiramisu that I wish I could reach through the tv and eat, my mom went from running her fingers through my hair to putting her hand down my shorts and started to feel up the front of my diaper. I blushed a little as her hand massaged the front of my diaper. “Mom. Come on. I told you only between the commercials.” I said as I squirmed on the couch. Her hand was bigger than most adult women. She was able to easily cover the front of my diaper as she rubbed it. 
   I know, but since it’s just you and me tonight. I figured why wait.” It was just mom and I tonight. Dad, Billy and Mike were on a camping trip with one of dad's friends. Sally and Kerry were in her room all night. They usually don’t like being disturbed unless it was for a diaper change. Mom and I like having these kinds of nights. We get to mess around. She always takes charge on nights like this. It turns me on like crazy. 
   “Mom, should we do this in the living room?” I asked as she slipped my shorts off. 
   “I don’t see why not. It’s just us here.” She said slipping off my shirt. “Besides, it’s always a little more fun when it’s not in a bedroom.” She went back to feeling up the front of my diaper. “How's that little pup? Does it feel good?” She knows I love getting the front of my diaper rubbed almost as much as I love doing it to someone else. 
   “Oh mommy,” yes. I started calling her mommy in moments like this. We had a bond like that. “Oh mommy, it feels amazing.” Billy didn’t like our parents' hard scales sometimes. He said they hurt when they rubbed against his fur and down to his skin. It didn’t bother me. I don’t know why,but I kind of liked it. 
   As mom continued to rub the front of my diaper I started to feel my sheath start to swell and my dick start to emerge from it. She could feel it through the padding and focused on that as she rubbed. “Cum for me little pup.” she whispered in my ear.
   I let out a moan as my dick was rubbed with my wet padding. I didn’t know how long I was going to last but I knew this was going to be a good orgasm. I thrust my hips a little into her rubbing, just as I was feeling an orgasm start to build up, we got interrupted.
   “Mom” we both heard Sally call out. Mom stopped and we both looked over to the entrance of the living room near the stairs. “Mom, I know you and Jay are having some alone time but Kerry and I need a diaper change.” She said, stepping into the living room. 
   Mom gave a sigh and set me back onto the couch. “Okay, go get Kerry, bring some diapers and I’ll change you in here.” She said as she started to get off the couch. 
   “Actually mom, Kerry and I were wondering if Jay could change us, up in my room.” 
   Mom sat back down and thought for a second. She turned on a light by the couch and looked over at me. “Okay, he’ll be up there in a moment to change you and Kerry.” Sally perked up a little and thanked mom before running back up the stairs.
   “Mom, do I have to?” I whined a little. 
   “Honey, I’ve been around for a long time, and your father and I have fostered a lot of children. I know when a girl wants a diaper change and when they want a little more.” She said turning over to me. “Now I don’t know if that’s what they want, but remember one very important thing. Whatever happens in that room tonight. If one of the girls says no, you respect that. Understand? She said in a more stern voice. 
   At first I didn’t know what she was talking about. It hit me when she reminded me that no means no. “Yes mom, I understand.” I said as I picked up my shirt. 
   “Oh sweetie, you’re not going to need that.” She said getting up from the couch. “You go be with the girls, I’m gonna get a vibrator.” She said ruffling my hair and walking off.


   When I got up stairs, I knocked on the door, a second later it flung open. Kerry was the one who greeted me. She and Sally were wearing long nightgowns, both were pink. “Hey Jason.” She said, looking me up and down. The only thing I was wearing was a wet diaper. “Come on in.” She said stepping out of the way for me to come in. 
   “Okay, so who do I change first?” 
   “Why don’t you change your little sister first? Over here on the bed.” She motioned me over to Sally’s bed.  
   I smelled the air. If it was a diaper change with something more than at least I didn’t have to change any poopy diapers. I looked over at Sally, from the way she was looking at me and fidgeting with her legs a little I could tell she was ready for some sexual touching. 
   “Okay, I know I wasn’t called up here to do a diaper change. What do you two really want?”
   Kerry came up behind me and put her hands on my butt. “Well we were fooling around a little up here, I asked Kerry if she had been penetrated yet and she told me no. I asked if she would ever want to be, and she said only if her big brother Jason could do it.” 
    I looked over to Sally who was now sitting on the bed with her legs open. The front of the nightgown was covering her crotch but I could tell she was ready for something. “Why me?” Don’t get me wrong I was flattered, I wish I could have chosen my first. 
   “Well it was the first night mom and dad showed me what sex was like. Your dick didn’t go inside me, and since you were the first to touch me there when it wasn’t a diaper change. I want you to be my first.” 
   I started to get hard again. Sure there was the time where I rubbed my erection along her pussy and the times I rubbed her till she orgasmed, but to get to take her virginity and her giving it to me, was something I hadn’t done. 
   I walked up to her and pulled her up from the bed and started to kiss her. Billy and I had taught her how to french kiss. I loved how she masturbated to us kissing. I pulled her nightgown up and pulled it off of her. When it was off I went back to kissing her and let my hands go down to her diaper. I pulled the tapes and let it fall to the floor. When the diaper was off I moved her to bed. She scooted back and laid back with her legs open. Her pussy was wet, and not just from the wet diaper she had on. 
   I got down on my knees between her legs and went to lick her little pussy. I could almost taste the arousal in her fluids. I held onto her hips as she writhed on her bed. Mixed in with her moans I could hear crinkling. It wasn’t my diaper, so it had to be Kerry masturbating to what I was doing to Sally. 
   After a few seconds of eating my little sister out, her legs clamped together on my head. A little explosion of juices came from her pussy and gushed onto my muzzle. I licked up what I could and from my mouth but left her juices coated on her pussy.  
   Since I knew a girl's first time could hurt without some preparation, I gently slid my finger into her pussy. I heard her moan again as it slid in and met some resistance. “It’s okay Sally, just relax.” I said rubbing her inner thigh. As I felt her walls get used to my finger I gently slipped in a second. Again she moaned from the pleasure I was giving her but met resistance with her vagina. 
   When I felt she was ready, I stood up and pulled the tapes on my diaper and let it fall on the floor next to Sally’s. I crawled over to Sally on her bed and got into position. I told her to hold her legs under her knees and hold them apart for me. I lined up my cock and pressed the tip of it to her entrance and put my hands on her waist. 
   I looked down at her expecting to see a scared little girl looking up at me. Instead I saw my little sister, looking back up at me with expectant pleasure and a look in her eye that was willingly asking for it. “Are you ready Sally?” Sally put her hand on my chest and nodded. 
  Gently I pushed my hips forward. My tip easily slid in, as it widened I felt resistance again. I continued to gently ease my cock in. with one good thrust I felt a small pop and my dick slid down to my forming knot. Sally cried out in pain as she was penetrated for the first time. I rubbed her chest as she came down from the sudden shock of being penetrated. 
   “It’s okay big brother keep going.” She said through some light gasps. 
   I nodded and gently rocked my hips. Thanks to her orgasm a few seconds ago, she was nice and wet. I was gliding in and out of her with ease. 
   I picked up the pace a little. The rubbing mom was giving me earlier along with eating Sally out  had me edged out, I was very close to cumming. Back and forth my dick slid in her no longer virgin pussy. She was tight, she felt amazing. Each thrust forward I could feel my knot growing and slapping her little pussy lips. The wet sounds of the slapping were driving me crazy. 
   “Big brother, I’m…. I’m gonna….” She came again, this time her pussy walls clamping down around my cock. With the pressure around my dick I thrust forward again and pushed my knot past her lips and into her pussy. She screamed out in pain and I cried out in pleasure. 
   Rope after rope of cum shot from my cock and painted the walls of my sister's pussy. Quickly the pain from my sudden knotting subsided in my sister as she felt her big brother cum flood her pussy. 
   As I rode out my orgasm I leaned forward to my sister and kissed her. “I hope that was everything you wanted, little sister.” Sally didn’t respond. Her face showed everything, she was riding out one hell of an orgasm. 
   Looking down to our connected crotches, I knew my knot would not be free for a while. I held Sally close and rolled onto my back. She laid on my stomach and hugged me. I looked over to the other side of the room. Kerr was on the other side of the room laying on a pile Sally’s plushies.  
   Sally lifted her head off my chest and gave me a kiss. “That was, amazing big brother.” she laid her head back down and tightened her hug. “Thank you.” she said, nuzzling her head into my chest. 
   “I’m glad I could be your first kiddo.” I said, hugging her back.