It all started when you were still a kid, your dad remarried and you got yourself a little step brother, Ren. Ren was really clingy as a kid, always following you around and insisted to do everything together with you. At first, you thought he was cute...

"Sis~ Can I sleep with you tonight?" Ren said, smiling. He was basically a highschooler now, yet he still wanted to sleep with you like you two were still kids.

You felt like he had some intentions in his mind, under that innocent smile.