While the siblings were on one of their shopping trips, Kyousuke had decided to pop into the anime store. Leaving Rin to look around, he had popped into the adult section. As he was browsing the rows of anime dvds, he heard an unexpected voice.

"So you really are a pervert after all."

"Rin?!" Kyousuke exclaimed, whirling around with a surprised look. "What are you doing back here?"

"Is there a reason I can't be?" Rin regarded him haughtily, folding her arms.

"Well, I mean, this is the adult section and you don't like perverted stuff, don't you?"

"Hmph. I'm not a child anymore. I can go wherever I like." Rin held her head high. "I don't get it. Why do guys like this perverted stuff? It's weird."

Kyousuke laughed awkwardly. "Yeah, well, of course you wouldn't understand. It's a guy thing after all." He moved on, hoping she would wander off and go somewhere else. Browsing adult things while his little sister was standing right there was kind of uncomfortable.

"Hmm." In spite of his wishes, Rin was following him anyway with a curious expression.

"Uh, Rin? What are you doing?"

Rin shrugged. "Just curious. Maybe I want to know what kind of stuff my pervert brother is into."

"Can you please stop calling me a pervert?" Kyousuke walked around to the other side of the shelf, looking mildly exasperated. It was kind of painful to hear his own little sister calling him a pervert. He was a completely normal guy. Absolutely normal.

Kyousuke averted his gaze from the lolicon titles. He couldn't risk it, not now of all times. The title displayed on one of the boxes caught his eye. 'My little sister is just too cute and I can't keep my hands off!' it read. Against all judgement, he found himself pulling it out and reading the back. Kyousuke was so absorbed in what he was doing that he didn't hear Rin approach.

"Oh. So that's the sort of thing you like."

"Ack!" Kyousuke almost dropped it in his panic. "No... I was just looking, that was all!"

"Really?" Rin raised an eyebrow.

"Really!" Kyousuke's face burned red. Great, now Rin was probably going to think him a freak and avoid him for the rest of his life. How could he ever go on like this, being treated as an outcast by his own little sister?

"Hmm." Rin's gaze was drawn to the box. Kyousuke hastily tried to stick it back on the shelf. "Wait."

"Huh?" Kyousuke froze, looking at her in confusion.

"Why don't we watch it together?"

"What?" Kyousuke spluttered. He wasn't sure he had heard her right. "What, this? Are you serious?"

"Sure." Rin's face was blank. She really didn't seem to be kidding. "I want to see the stuff you like too."

Kyousuke looked at the box, then back to her, his jaw hanging open. "Rin, you do realise that this is hentai, right? It's perverted stuff."

"Yes, I know. I'm not an idiot." Rin's expression turned annoyed.

"Well... okay," Kyousuke said slowly. "But don't say I didn't warn you." His face was burning as he went to the counter, praying that the clerk wouldn't realise the girl with him was his own little sister. Fortunately, the clerk didn't comment or give him any odd looks.

That evening, Kyousuke and Rin sat together on the couch in front of the television. Kyousuke had already loaded the DVD into the player and was about to press 'Start' on the remote.

"You are absolutely sure about this, Rin? You can still back out."

"Of course I'm sure. Just get on with it already."

"Fine." Kyousuke hit the button.

Not once during the movie did Rin make a sound. Kyousuke would glance at her every so often and find her utterly riveted, her eyes glued to the screen. He couldn't believe it. Riin was actually watching this stuff alongside him.

The credits soon rolled and Kyousuke switched it off. "Well, how was it?" He peered at Rin, noticing the rosy hue in her cheeks.

"Uh... it was kind of hot."

"Hot?" Kyousuke repeated.

"Mmm." Rin nodded. "It made me hot to trot."

Kyousuke let out a loud splutter. "Um. Okay. Cool."

"Hey... Kyousuke..." Rin turned her head to look at him. "Do you find me cute?"

"Well, er..." Kyousuke blinked. Yes, he did think Rin was cute. It was okay to think his little sister was cute, wasn't it? Still, he wasn't sure if he should be admitting it directly to her. What on earth had gotten into her, making her ask such a question? It was so unexpected coming from her.

"Yeah?" Rin crawled up to him, putting her face close.

Kyousuke couldn't help but be aware of how so very close she was. He leaned back, swallowing thickly. Was it just his imagination or was his face getting hot? "Uh... well..." On second thoughts, telling her she wasn't would probably be just insulting. "I suppose you are kind of cute."

"Really?" Rin looked thoughtful. "Then, does that mean you like me?"

"Um... uh..." Really, where was all this coming from? As Kyousuke was struggling to make sense of all this, Rin's face loomed closer and he felt something soft and wet touch his lips. No way. It couldn't be.

Rin was actually kissing him?

Rin drew back, her face turning even redder.

"Rin." Kyousuke touched his lips, looking at her with consternation. "Why did you do that?"

"Hmm. I guess I wanted to see what it would be like." Rin averted her gaze. "Didn't you like it?"

Kyousuke was too shocked to even think. Rin had kissed him. His own little sister had kissed him. His cute little sister. His face grew even hotter and the roaring of blood filled his ears. His heart beat rapidly against his chest. "Um... ah..."

How could he admit that he had liked it? Wait, what was he thinking? He wasn't allowed to admit such things! Not about his own little sister! But he couldn't help wishing... no, no, no, it was forbidden. It was a sin. He couldn't do it.

"Rin... don't tell me, you actually... like me?" Kyousuke choked out. It seemed insane, completely and utterly insane. How could Rin of all people actually...

Rin lowered her head, chewing her lower lip. "I know you're my idiot brother, but still... I wanted to do it. I wanted to kiss you. I want to do things like the brother and sister did in the movie. Is that really so wrong?"

Kyousuke's head was whirling. He could hardly make sense of what was happening. "I..." His heart pounded even more. Could he really do it? Cross into forbidden territory with his own little sister? He could feel Rin's hand brushing over his leg, creeping up. Every inch of him tingled with anticipation.

"Ah." Rin made a surprised sound, looking straight down. Her eyes met with Kyousuke's. "You want it too, don't you?"

Kyousuke swallowed, staring into her eyes. Yes. Even as a voice was screaming at him that it was forbidden, that this was a line he should never cross, he was consumed by desire. "Rin. Is this really what you want?"

"Uh huh." Rin nodded. There was no hesitation to be seen. Her eyes shone, bright and clear, full of lust.

Kyousuke reached a trembling hand out to touch Rin's cheek. He brushed his thumb against her flushed skin, caressing her cheek then moved his hand to the back of his head. Then, he brought his lips to hers in a deep, lingering kiss.

Never before had he ever dreamed of kissing Rin.

But here he was, kissing his own little sister, and it felt so good.

Rin's arms snaked around Kyousuke and she kissed back, fiercely mashing her lips into his. Kyousuke sank back onto the couch, pulling Rin against him. In the moment, neither of them cared that they were brother and sister. They just wanted it.