I am now 20 years old and I just got back from break in college I was sitting in my chair and this random thought popped up in my head from awhile ago. I remember me and my sister used to play fight a lot as kids and we were still sometimes still fighting when I was 15 and she was 13. It has never gone sexual no touching at all. This one time however she was on the ground and I was pretending to stomp on her vagina and then I remember I just stood there with one foot on her privates for like 5 seconds and struck a victory pose like I won the fight. She was still clothed and stuff but she said can u stop this is weird. Which made me think to myself like a “wtf are u doing” kinda thought and immediately stopped and we went off to our rooms. I remember being full of guilt and I asked her sometime after if I did anything to ever hurt her or make her uncomfortable and she said no. Ever since this thought popped in my head I feel so so guilty it’s not even funny I want to puke every time I think about it. I feel like a terrible person. Overall it looks like my sister forgot about it. We have a pretty normal relationship. She is going on to be Valedictorian. She and I still make jokes to each other, she gets me Christmas gifts, and she still even tries to play fight with me sometimes (which I try my best to put an end to immediately). Overall I want to know what you guys think of this. I need to get it off my chest.