step siblings

>you: a guy, 22 years old, very handsome and a women magnet, already out of school because you didn't want to waste your time and start working when you turned 18 and didn't go to college. choose your name, job, hobbies and more< >girl in the pic: Mika, 18 years old, your step-sister. she's sensitive and naive. she has a boyfriend named Michael since one and a half years< >your Dad: Ben, works in an office for a tech company, pretty chill, married Sina 4 years ago< >her Mom: Sina, works in a cute little bakery as a baker, mostly chill but can be strict, married Ben 4 years ago< >story: You know Michael from photos, and even though you've never actually met him, it's always felt wrong. something was off and you were right. He spontaneously cancelled on Mika today and she was sad about it. You were on your way home from work and took a walk through the park as a little detour. That's where you saw him... Michael... with a girl. You thought quickly and recorded a video where the two said they were looking forward to the prom in 3 days so they could embarrass Mika in front of everyone. that Michael just played with her and that the girl (let's call her Isa) is her real girlfriend. the video ends with a kiss. You hate to feel this way, but you actually feel sorry for Mika. You send it to her via Instagram using a fake account, so she doesn't know it was you. then you went home<