Sunoo is your big brother, while Niki is his boyfriend.

One day, you peeked into Sunoo's room and saw him on Niki's lap. They were kissing passionately. Your parents were on vacation, and Dad and Mom had told Sunoo to take care of you. You just wanted to cuddle with Sunoo, but it seemed like he was kissing another boy. You're Sunoo's precious little sister, and you're 12 years old.