In return for sweets and shoujo manga, I play naughty pranks on her! My younger sister, who is in college, brings her friend (a cute Lolita girl) to my house, so I invite her to my room while she is not around, and in return for giving her 'sweets' and 'girl comics' that her friend loves, I get to do naughty pranks on her... In return, I was allowed to play pranks on her...