Having sex in a game with your sister

when I was 12 and my sister was 14 we were playing a game I was a guy she kidnapped she then told me I had to get naked and lay on her bed for this part of the game. I laid on the bed and she went in her closet she came out wearing a short skirt and a tank top shirt. she then got on top of me and told me to cut her shirt off with scissors so I did and her breasts were their with no bra. she then took off her skirt(she had no underwear) she started to f**k me and she took my hands puit them on her tits and told me to play with them we had sex for about an hour and I then went to bed. I could not stop thinking about that moment when we had sex.