Genine crept along the hallway of the family house, her feline pawpads making no noise on the carpet. She was the younger of two cat siblings at 11, a cute little white kitten. Her brother, a soft gray of about 20, still lived at home. He paid rent, so the parents didn't bother him much. Genine's room was right next to his on the second story of the house. This meant she could usually hear whatever dumb game or loud music he was playing, and she would yell at him, but he would just turn it up instead. About a year ago though, she'd been hearing something else.
	Aaron was a lot of things; dumb, smelly, stupid, annoying... but he was also athletic, and good looking. Not that she would know, boys were gross. But it seemed like he had a different girl every month, and they were always really into him. In the past, he would leave for the night and not come back till morning, but a few weeks ago she started hearing strange noises coming from his room. Repetitive rustling, a girl moaning every now and then. At first she thought it was an intruder, and she was scared to go out of her room, but as she listened she didn't think an intruder would be in there so long or make such weird sounds. The next night, she heard the same commotion, so she went to investigate. 
	Aaron's door had a problem. It didn't latch right, and the resting position was slightly ajar, making it incredibly easy to peek into. Aaron usually kept his TV on low as background noise when he wasn't gaming, so Genine would see the beam of light through the crack of the doorway on her way to the bathroom late at night. When she peered through the crack this time, however, it wasn't the television that caught her attention.
	Both Aaron and his girlfriendat-the-time Trish were naked. Trish was a petite little calico, and had been dating Aaron for a week now. Aaron was lying on his back, and Trish was sitting on top of him, bouncing up and down while making those strange noises. She had been told that boys were different than girls, but no one had ever told her how... and now she knew. Aaron's boy parts were big and swolen and looked like a banana, and it was going inside of the girl, who was apparently loving it. She would tell him yes a few times, or more, or harder, or that it was "so good." She had watched out of curiosity with some very confused feelings, all the way until they had finished, and the girl rolled off of Aaron and laid by his side. After that it was just boring cuddling, so she had run back to her room. She didn't know what exactly had just happened, just that it was weird, and she had seen something she wasn't supposed to see.
	Genine had all but forgotten about it... until she had started to have some strange new feelings she'd never felt before. One night, she noticed she was a little more wet "down there" than usual. It also had a bit of an itch to it, and felt slightly more swollen. She had pressed on it to relieve the itch, and it felt *good.* Like, *really* good. So she pressed on it harder, massaging it. The feeling was intense, and caused her to purr softly at the sensation. And that's when she heard it; that sound again. She remembered what it was, and the thought made her tingle down below, causing her to blush. That was her brother... but was she supposed to think about him like that? As a kid she said she was going to marry her brother one time, and her parents had told her that brothers and sisters didn't get married. But it didn't count if she just thought about it... right? 
	She had gone and watched her brother do the thing with his girlfriend again through the crack of the door, but this time, she pressed on her panties. She sat outside the door and rubbed herself to her brother "playing" with his girlfriend until they had finished. The sight of his boy parts large and engorged like that made her feel funny, and she couldn't stop thinking about it, despite the fact that it only made her itch even more. Maybe, she thought, if she got something that looked like a boy part, she could itch it herself; she took one of her hairbrushes and experimented with slipping it inside of her, pretending it was her brother. It hurt a lot at first, and was very oddly shaped. The pain eventually went away, but she couldn't find a way to use it that felt good, so she gave up. She had watched her brother the next couple of nights, until that itch slowly went away on its own.
	And now, the itch was back, and worse than before. That's why she was currently outside of her brother's room, peering inside. She could see a bottle of liquor on his night stand, with a significant amount gone. Aaron was on top of Trish, sticking his peepee (she had learned that word since last time) into her in a thrusting motion while she held onto him. Genine pulled down her pajamas and her panties and leaned back against the door frame, listening to her brother have "sex" (another word she learned) with Trish while she pressed on her tender girl parts.
	She felt the pleasuring sensation start to tingle, and pressed harder, leaning fully into the door frame to focus. She felt naughty with what she was about to think, but she had to. It was only her that would know, right? She imagined a different world where she was Trish and Aaron wanted to have sex with her. She tried to imagine what it was like for Aaron to slowly slide his peepee into her tender area, pretending the moans from Trish were hers, lowering her ears submissively and letting him do whatever he wanted... She stepped out of her panties and pajama bottoms to get a better position against the door frame, purring loudly.
	Until she slipped. Aaron's door opened inward, and Genine was sent tumbling inside with a surprised cry, landing on her back in the middle of the room, looking up at the confused pair.
	"What the fuck?" Trish said in surprise as Aaron backed off of her. He was still fully flagged from having sex, and Genine flushed both from the embarrassing situation and the fact that she had just been thinking about him that way. She was naked from the waist down in front of her brother, who was also naked in front of her. Her ears flattened against her head in shame. 
	"Genine, what are you doing in here? Go back to bed," Aaron added. His speech was slightly slurred, and it was obvious she'd been drinking. 
	"Sorry," she squeaked out, scrambling to her feet and tugging her shirt down to hide her shame. "I um... h-had a bad dream and... was just walking by..." she stammered. She was mostly just praying she didn't get in trouble for barging into Aaron's room and interrupting him during something private, lest he tell the parents and get her grounded. Her heart was pounding, she wanted to just run away.
	"You were outside of our door listening, weren't you?" Trish asked, sitting up on the edge of the bed. "See Aaron, I told you I heard something. Not the first time, either." Trish also sounded  just as drunk as Aaron.
	"Were you listening to us have sex?" Aaron asked in a very disbelieving tone. She knew she'd been caught, but didn't want to lie. It didn't help that his boy part was still out for all to see, and that she had been interrupted in trying to satisfy herself, causing it to tingle at the sight and itch even worse. She didn't say anything.
	"Oh my god," Trish said, half walking half stumbling over, "she totally was. Look Aaron, she's even wetter than me." Trish made it close enough to grasp Genine's pajama top, and before she could move away, she yanked it up to expose Genine's lower half, giggling. The air felt cold on her hot parts, and her fur was matted from being soaked. "She *totally* wants you, Aaron."
	"Trish, that's weird," Aaron replied with a laugh. "She's my sister."
	"No but like, wouldn't that be *so hot?* That's hot," Trish said, and Genine could smell the alcohol on her breath. 
	"No way, you're drunk," Aaron replied, but then after a pause, he seemed more interested; "what, really?" Genine could see Trish take on a sly grin, and her tail twitch to and fro like she had a sinister idea.
	"Yaaa, fucking your sister is like, one of the top results on the porn sites," Trish told him eagerly. "It's *so* hot. And she's already wet, look." Genine's pajama top was tugged up again, but she didn't dare move. She had been fantasizing about it, yeah, but to actually do it... one half of her felt like her heart was going to explode, the other instantly flushed at the thought, sending warm tingles through her body, puffing up her fur.
	"Woah," Aaron said, and raised his eyebrows at the sight. His tail started to sway in an interested manner, too. "Damn..."
	"You should do it," Trish said, putting her arm around Genine. "He's *so* good." Should she dare? She wanted to, but she felt paralyzed, rooted in place. Aaron rubbed his boy parts, his expression showing he was really warming to the idea. Why was Trish encouraging this so much? She really did want it, didn't she? But why did Trish want her to do that to her own boyfriend? It was all so confusing.
	"But..." She wanted to argue, but she couldn't think of a reason why. They were older and knew everything about sex, and if they said it was okay, then it had to be. "I won't get in trouble, right?" Her own tail twitched in anticipation.
	"Not if you don't tell anyone," Trish said with another giggle, leaning on Genine after wobbling a bit. *Not if you don't tell anyone.* That meant it *was* bad in some way, but if they weren't telling, and she wasn't telling, then no one had to know, especially the parents. Like sneaking out of her room late at night to raid the fridge, or play on the computer.
	"O-okay," she finally agreed. She trusted the two adults in the room, especially her own brother. She stood there for a moment, still thinking about what she was about to do. Was she really going to do this? Her brother was waiting on the bed. Tentatively, she stepped forward and climbed into his bed, lying down on her back. Aaron loomed above, his penis still as huge as before. He knelt down on his hands and knees and crawled overtop of her, she seemed tiny under his muscular adult body. Her heart was throbbing, and she was worried about it hurting like when she tried herself. But she *wanted* this. She wasn't going to run away now. She saw Trish climb onto Aaron's bed and crawl her way to the other side, lying with her back against the wall to watch.
	"Just relax, he's really good at this," she repeated, giggling again. Aaron wore a smug smile at the statement, it seemed like he really enjoyed hearing that. He grabbed his thingie and pressed it against her swollen girl parts, causing her to let out a moan.
	"Holy shit, you're so wet you're practically begging for it," Aaron commented, his tail swaying eagerly. "You want this so bad, don't you?" Genine couldn't deny it. It's what she'd been fantasizing about every time she rubbed herself outside of his room. She gave him the smallest of shy nods as she quivered under his touch. With her encouragement, he crouched lower and slowly pushed into her.
	The effect was immediate, she felt a shock go through her entire body as he slid deep inside of her, but it was intense and heavenly. There was a slight bit of pain as his adult boy parts stretched her little girl ones, but the fact that she was so soaked before he even began helped to smooth things along.
	"Hah!" she squeaked loudly, overwhelmed by all the sensations flooding in at once, gripping tightly onto his arms with her claws, causing him to pause.
	"You good?" The pause made the heavenly feelings subside, which frustrated her slightly. 
	"Uh huh," she mumbled out, wiggling under him, to show she wanted to go on. And continue he did. He pulled out slightly only to thrust himself back in, causing Genine to squeak again. This time, he didn't stop, but instead proceeded to push himself into her repeatedly, just like he did with his girlfriend Another squeak, and another. She was doing the thing with her brother, the *sex,* and it felt *incredible.* She wrapped her tiny kitten legs around his waist to get a better grip, the feeling of his penis thrusting deep within her finally satisfying that itch in her belly, and she wanted *more.* 
	"Good kiten..." he purred to her as he continued to hump her. He placed a paw on her stomach and slowly felt up her body, stopping to rub her nipples under her pajama top, which added even more pleasure to the whole experience, if such a thing was possible. She arched her back at the sensation, clinging to him with her claws yet again and squeezing her legs as he kept going. She was getting closer to a point she had never been to before. It felt like when she was pressing on her girl parts while listening to her brother, only this one was a million times better. She wanted it. No, she *needed* it. She didn't know how she knew, but all she knew in this moment was that she *needed* this. The sensations finally reached a fever pitch, her whole body shook, and for a few precious seconds, pleasure flooded her entire consciousness, and all she could do was cry out and hold on tight to her brother as tightly as she could until it faded.
	"Fuuuuuck," she heard Aaron moan as an entirely new feeling emerged; from deep inside her stomach, she could feel his boy parts throb and twitch, and hot warmth completely filled her up from the inside out, to the point of leaking. She panicked just a little at this, it felt like he was peeing inside of her. "Goooood little kitten."
	"Did you... pee in me?" she asked in between panting for breath. Her brother had stopped his thrusting and seemed to be resting for a moment. He laughed and pulled out of her, and the sudden shift in fluid made her quickly cup a paw against herself it so it wouldn't leak all over his bed.
	"Nah," he answered, laying back beside her, "it's called cum. It means you did good."
	"I... did?" she asked, feeling oddly proud of herself. She didn't think she *did* anything at all, but apparently she was good. He had even called her a good kitten, which made her fur fluff out happily.
	"Hell yeah," he said, "very good."
	"That was hot as fuck," Trish said from the other side of the bed, pulling Aaron over to share a kiss. Genine had forgotten Trish existed, to be honest. 
	"Yeah?" Aaron asked, returning the kiss.
	"You're so hot," she moaned. The kiss turned into a makeout session, which turned into groping. Genine felt rather awkward holding her paw over her nethers, and they seemed to have immediatly forgot about her. She took this opportunity to hop off the bed and slink away. Her brother didn't even notice. She collected her panties and pajama bottoms which she'd left outside the door, and hurried to the bathroom.
	Once inside, she took the opportunity to observe her tender area. The heat and the swelling had gone down dramatically, and she didn't itch anymore. She still felt tingly all over her body, it was a pleasant feeling and she enjoyed it very much. She noticed she had started purring again. Another thing she noticed was the fluid Aaron had put inside her. This "cum" was a thick, white, almost gooey substance, and there was a lot of it.
	*My brother...* she thought to herself, as she cleaned it up with toilet paper, *my brother put his peepee in me. His cum is inside of me. He had sex with me.* She was purring deeply now as she wiped the last of it away, at least until it stopped leaking. *I'm a good kitten...*
	With her itch taken care of, Genine suddenly felt incredibly exhausted. It was like turning off a light switch. She crept back to her room, and along the way snuck a glance in the crack of the door; both her brother and Trish were passed out in bed. She crawled into her own bed and contemplated what had just happened. 
	*Brother...* it was the last thing going through her mind as she fell asleep, still softly purring.