Ada’s First Heat
	Isaac flicked through the channels on the tv trying to find something to watch. It was the middle of the day, so nothing interesting was playing on any of the usual channels. He didn’t want to put in the effort to get his game system running just yet, but it was looking like that may be his only real option. He stood up with a stretch while looking around the room.
	Thanks to his mom’s job, they had a pretty big house. Just the living room was huge, with space for a full-sized couch, flatscreen, and two armchairs. The walls around him were lined with bookshelves, mostly for complicated engineering things, but a few were reserved for comics and novels. Wherever there was space between shelves, there were pictures of Isaac and his twin sister, Ada. Isaac’s gaze rested on one of these photos, taken at the beach.
	The photo showed Isaac and Ada standing together, the former drenched while the latter laughed at him. The twins clearly took after their mother and father to different degrees. Isaac had a human face and torso, but his arms and legs were covered in black fur, with his fingers and toes a distinctive silver. He had a fox’s tail and ears, inherited from his father, as well as streaks of brown hair amongst the red inherited from his mother. Ada, meanwhile, only seemed to inherit her father’s ears and tail, which had a red tip.
	Speaking of his sister, Isaac blushed as he recalled the events of that morning. He had been walking past her room when he suddenly smelled something irresistible. He had no idea what the smell had been, as it had been his first time smelling it, but it had an immediate and unexpected effect on his body, causing something in his stomach to flutter pleasantly.
	He had decided to ask his twin what the smell was. Upon opening the door, however, he was overwhelmed with the power of the scent. His sister was sitting on her bed, naked for some reason, in some kind of daze. If that wasn’t embarrassing enough, his pants had grown extremely tight as soon as he saw her. With a quickly mumbled, “Sorry,” he closed her door and ran down the stairs, which brought him to where he was now.
	Isaac sighed and gazed across the room towards the unexpected guest he’d found after arriving downstairs. Sarana was an older girl from the neighborhood that their mom hired occasionally to watch them. She didn’t think we really needed it, but figured it was only the responsible thing to do. 
	The young feline had been lounging on the couch and looking at her phone. Upon seeing the young hybrid, she’d explained that their mother was going on a trip and wouldn’t be back for a while, so Sarana was going to be staying with them for a little bit.
	Isaac watched as the girl’s ears perked up and her nose twitched as if she’d just smelled something interesting. A second later, Isaac smelled it too, followed by his sister coming down the stairs. “G’morning,” Ada mumbled as she made her way towards the kitchen.
	“Mornin’ sleepyhead. How ya feelin’?” Sarana’s tail swished back and forth, a slight grin on her face as she questioned the younger girl. Ada didn’t respond, simply continuing on her way to get herself some breakfast. Isaac, meanwhile, sat right back down, trying really hard not to let Sarana see his boner.
	Ada’s mind had been fuzzy all morning, and her body felt weirdly hot and tingly. She had been feeling so warm when she woke up, that the first thing she’d done was take her clothes off, which felt nice but didn’t really help as much as she had hoped. It was about this time that she felt a slight breeze as the door opened. She didn’t quite register that the door was open until she heard her brother’s mumbled apology and the sound of the door closing. 
	She shook her head, trying to clear some of the fog, then got up and gathered her things for the shower. She tried a cold shower to clear things up, which was much more effective. Feeling more awake now, she went back to her room and dressed in a skirt and tank top.
	Her head was already starting to fuzz up again as she made her way downstairs. She was with it enough to mumble a quick “g’morning”, but she barely registered her babysitter’s greeting. Or her existence, for that matter. She poured herself a bowl of cereal and sat down at the table to eat. As she ate, she felt oddly aware of her brother’s presence in the other room. She wasn’t really sure why, but his scent seemed to stir something in her belly.
	Upon finishing her bowl, she rinsed it out and walked back to the living room. The first thing she noticed was Isaac sitting on the couch with a pillow in his lap. He seemed to be looking at anything in the room but her. The second thing she noticed was Sarana sitting in one of the armchairs with a smirk on her face.
	“Where’s mom?” Ada asked, as Sarana’s presence typically meant that their mother was busy doing something else. 
	“She’s gonna be out for a while. She said she might be gone for as long as a week, so I’ll be staying around until she gets back.” The older feline stood up and made her way to the kitchen. “You should start up the PlayStation. Isaac seems preoccupied, and nothing’s on tv. I’ll kick your butt in Street Fighter after I get a drink.”
	Ada nodded, walking to the tv and grabbing a few controllers, turning the system on before taking her seat beside her twin. The entire time, she felt an odd sensation growing between her legs, a sensation which just grew more intense as her knee brushed against Isaac’s. With a slight blush, she handed a controller to her brother. 
	Isaac silently took it, still attempting to avoid her eyes. Ada didn’t say anything, not exactly comfortable facing the boy directly either. Shortly after they got the game set up, Sarana returned and took a seat on Ada’s other side. For some reason, the older girl scooted really close, causing Ada to have to press even closer to her brother, causing both of them to let out a slight gasp.	
	Isaac wasn’t sure what was happening. He heard Sarana giggling to herself as she forced the two siblings to practically sit on top of each other. Every part of his body that touched his sister’s felt like it was burning up, and he wasn’t sure if that was because she was hot, or if it was something else. While he contemplated this, Sarana started talking again.
	“So how about we add a little something to this, hm?” Sarana’s grin grew wider as she explained the rules. “We’ll do party rules. Whoever wins keeps playing, loser hands off the controller. Loser also has to take off an article of clothing~”
	Both twins looked at Sarana with confused expressions. “Why would taking clothes off make it more fun?” Ada asked, Isaac nodding in agreement.
	“Just trust me on this one, it will be very fun.” Sarana hid her smirk behind a hand, her feline nose having long since picked up on what the young twins hadn’t yet. With that, she took the controller from Ada and picked her character. “You’re against me first, hehe.”
	Within the first half hour, the twins were both in their underpants, while Sarana had so far only had to remove her shirt due to an unfortunate mistake on her first round. Between Sarana’s experience with the game and the twins’ inability to focus, they never stood a chance.
	And with one more win under her belt, Sarana gave Ada a gentle poke on the shoulder. “Hehehe, time to take em off, little one~ Rules is rules!” Sarana had noticed how the young girl had started crossing her legs, clearly trying to hide something. With her loss, Ada stood and let the others see exactly what she’d been hiding.
	A large wet spot had formed on the girl’s panties, a similar spot on the couch where she had sat. Isaac’s eyes were glued to his sister’s crotch as she slowly, nervously began to remove the soaked garment. Strings of moisture connected the panties to Ada’s puffy little slit.
	Sarana let out a low whistle before motioning for Ada to come sit with her. “Dang, girl, it must be hitting you hard!” Ada was about to ask what the older feline meant when she felt a finger press against her crotch. Sarana began gently fondling the young girl’s pussy, pulling a few adorable moans from Ada’s lips. “I’m a little surprised your parents haven’t told you about this yet. Your mom doesn’t have to worry about it cuz she’s human, but since you have some fox in you, you have to worry about going into heat.”
	As Sarana explained why Ada felt like she did, Isaac watched on incredulously, wondering if he’d been forgotten. He’d already been hard when his twin was undressing, but watching her get played with by the older girl, hearing her moans, and smelling the pheromone-laced air brought him to a point of painful rigidity. Sarana heard a pained noise from beside her and looked over to see Isaac wincing at his painfully hard erection. She grinned and reached over with her free hand, surprising Isaac.
	“Now, the other problem with heat comes with the effect it has on boys around you. Look at your poor brother over here, at how hard he’s become. Maybe you should help with that, hehe.” With that, Sarana removed her fingers from Ada’s pussy and guided her towards Isaac’s cock. At Sarana’s direction, Ada kneeled down in front of her brother, finally looking into his eyes.
	There, she saw something she’d never seen before, an emotion she wasn’t familiar with, but she assumed must be “lust”. Following the teen’s instructions, Ada wrapped her fingers around Isaac’s cock, feeling its heat as his member throbbed between her fingers. She began slowly moving her hand up and down its tapered length, watching Isaac’s face as he fought against the pleasure that felt like it was going to overtake him.
	Mostly unnoticed by the twins, being preoccupied as they were, Sarana had stripped down and was watching the scene unfold before her with more than a little lust. Her fingers worked away at her own honeypot as she directed Ada to put her mouth on Isaac’s rocket. The look on Isaac’s face made it clear how much he enjoyed it, his hips starting to move slowly in order to hump at his sister’s face.
	Isaac felt something building up inside, but he wasn’t sure what it was, just that he had a pressure growing in his loins that grew with each movement of Ada’s tongue. Without warning, the pressure suddenly released, causing Isaac to cry out as he unloaded inside his sister’s mouth. She was clearly rather surprised, as she reared back as soon as she felt the salty liquid touch her tongue, and thus receiving a generous coating of the stuff over her face and chest.
	Despite her initial surprise at the gooey white stuff, Ada didn’t mind the taste that much. It wasn’t pleasant, per se, but it made her feel even hotter, which she didn’t mind. She was about to scoop some off one nipple when Sarana stopped her, picking Ada up and setting her in Isaac’s lap just behind his cock. She looked into the young girl’s eyes as she leaned in and licked Isaac’s semen off her chest, causing the sensitive girl to moan even more.
	Isaac, for his part, was recovering from his very first orgasm, and decided to copy Sarana’s moves from earlier. He reached around his sister, pressing his fingers against her dripping sex. He rubbed around the outside for a few seconds before he found something shaped a little like a button near the top of her pussy. When he rubbed it, her moaning seemed to grow even louder, so he decided to focus most of his efforts on the little bean.
	Sarana noticed Isaac’s movements and giggled, “Your brother must be a natural with how fast he found your clit!” Ada wanted to ask what a clit was, but she was too focused on the sensations threatening to overwhelm her. Now it was her turn to feel something building, a pressure in her loins and a fuzziness in her head. When the pressure finally burst, she arched her back, dug her fingers into Isaac’s thighs, and shuddered as her mind went blank.
	Isaac winced when he felt Ada dig into his flesh, but even without necessarily knowing what an orgasm was, he could tell she’d just experienced something similar to what he had. As Ada was beginning to come down, he ran his hands up and down her body, feeling closer to his siter than ever before. When she fell back against him, her energy spent, he turned her head and gave her a kiss on the lips, Ada returning the kiss in kind.
	“You two are too damn cute, I’ll have you know that. However, we’re not exactly done yet. There’s still something we’ll have to do if you really want to help that heat go away~” Sarana pressed up against Ada, settling down onto the other side of Isaac’s cock. She reached forward, gripping Ada’s thighs and pulling her toward herself.
	Both Ada and Isaac held their breath, watching as Sarana held Ada’s pussy over Isaac’s cock. “You ready?” The older girl asked, wanting to make sure the siblings were prepared. Both nodded vigorously, anxious to take that next step. With their consent, Sarana lowered Ada’s hips, gently spearing the young girl on her twin’s cock.
	Ada winced slightly, feeling a sharp pain momentarily when her brother’s cock made it about halfway, but the pain was quickly replaced by pleasure as Sarana leaned in and started to kiss her. After holding Ada in place for a moment, letting her get used to her brother’s member, Sarana continued lowering her until Ada’s pussy kissed Isaac’s knot. 
	Both of the twins seemed to be reaching their limit again, still sensitive from their previous orgasms. “Take a deep breath for me, Ada, as this might be a tad uncomfortable.” Unsure what the older girl intended, Ada took a deep breath, letting it out quite rapidly as Sarana pushed her onto Isaac’s knot. Tears came to Ada’s eyes as Isaac filled her completely, his knot swelling and holding them together. With the pressure on his knot, Isaac went over the edge, his cock starting to pump his sister full of baby batter.
	“And there we go. Assuming Isaac here is like some of the other boys I’ve been with, you’ll probably be stuck like that awhile. If you wanna make him feel even better, you can always bounce up and down gently, or even squeeze down on him with your pussy muscles~” Sarana started walking away as she gave this last advice, walking back for another drink from the kitchen.
	Isaac panted gently in his sister’s ear, giving her a kiss on the neck. “S-so, uh, that was pretty… intense.” Ada giggled, leaning back against her twin-turned-lover, sighing into his embrace. “Intense, yes, but so fun.”
	Upon her return, Sarana passed the twins each a drink and threw a blanket over them. “Just so we’re clear, I want a piece of that next time. We’ve got plenty of time until your mom gets back, so no rush right now.” The twins blushed a little, nodding towards the older girl. With that, Sarana turned the tv to Netflix, making some joke to herself that the twins couldn’t hear while they waited for Isaac’s knot to shrink.
	Ada was the first to notice, feeling the pressure start to subside as a trickle of moisture rolled down her leg. “Ah, it’s shrinking,” She said, mainly for Sarana’s benefit. Sarana rushed over quickly, moving the blanket so she could get a look. When she spotted the telltale leakage, she started lapping up the milky liquid, causing both of the kids to make sounds of pleasure.
	When she was sure she’d gotten most of it, she leaned back and wiped her face. “I think we’ll have a hard enough time cleaning up without having to worry about cum stains. You two go clean up in the bathroom while I see what I can do here.”
	The twins followed her orders, walking hand in hand to the bathroom where they washed off the sweat and fluids from the last hour. While in the shower, Ada got a mischievous idea. “Hey Isaac, could you do me a quick favor?”
	Isaac raised an eyebrow as he nodded, not sure where this was going. “Yeah, I guess? Do you want me to wash your back or something?” Ada’s grin grew wider as she put a hand on his shoulder, gently pressing down.
	“Something like that~ You made a pretty big mess earlier, and I think it’s only fair you clean it up, no?” With Isaac now on his knees, Ada thrust her crotch out at him. It took him a second to get what she was asking, but when he did, he blushed and leaned in, tentatively burying his face in his sister’s cum-glazed pussy, tasting himself with every lick. Ada made small, pleasured noises as she watched her brother, thinking about all the new things she could get him to do going forward.