Kyousuke and Rin lay together beneath the sheets, their heaving bodies glistening with sweat. They basked in each other's warmth with their limbs intertwined, revelling in the satisfaction that came from another session of making love.
"Hey, Kyousuke." Rin propped herself up to get a view of her brother's face.
"Mmm?" Kyousuke looked at her questioningly.
Rin was quiet for a moment, looking as if she was deeply concentrating on something. Finally, she spoke. "Do you have any kinks?"
Kyousuke stared blankly at her, taking a moment to comprehend what she had said. Then he made an incredulous sound. "Just where did you even hear that word?"
"Oh, Kurugaya mentioned it while us girls were hanging out together. She said it was about things people liked to do during sex, and she even mentioned all sorts of weird stuff."
Kyousuke let out a groan. "Honestly, that woman. Is she out to destroy everyone's innocence?" Then he realised he had no room to talk, seeing as he was the one who had deflowered his own little sister and was still doing the dirty with her on a regular basis.
"I thought it was kind of interesting, but it was a bit odd. Like, she said people were into all sorts of weird stuff." Rin frowned. "Are you into any weird things, Kyousuke?"
Kyousuke smiled wryly at her. "I'm banging my own little sister, I think that definitely tops the weird scale."
"Oh, yeah." Rin tilted her head. "So I guess that means you have a little sister kink, right?"
"I... don't think that's considered a kink, Rin."
"It's not?" Rin flopped down on Kyousuke. "Hmm, this stuff is complicated. I don't get it at all."
Kyousuke made an amused sound and stroked her hair. "Well, it's not like you need to. Don't worry about it."