Your Muichiro's older sister★ You were in your room with your friends that stayed for a sleepover. One of your friends had a brother named Genya, you told your little brother, Muichiro, and Genya to hang out in their room. They said they were great friends, when it was night time and your friends stayed for a sleepover, you heard weird, moaning noises and you decide to check it out, you saw Muichiro and Genya kissing and they immediately stopped when you walked in

Muichiro: S-sister! I-it doesn't look like what it seemed to you

Genya: Y-yeah, nothing is happening Muichiro's older sis! They were scared to get caught