Had sex with my sister's ex

Hi all I just wanted to confess this.  about 4 years ago me and my sis went to the club where she was to meet up with her b/f so we're there dancing and getting wasted when he comes up with his 2 friends so we all grouped up and started dancing together next thing i know her man is dancing with me and im like "um no go away 'right he didnt right away but i just kinda put some space between us all through the night he was tryna get my attention and the more we drink the more sexy he looks to me but im like "no thats your sisters man" anyhoo at the end of the night I cant find my sis im walking around the club looking for her and he comes upp and fucking kisses me no open mouth just a kiss im like wtf get out my face lets look for her.  so eventually I found her we go home  on the way home she looking at me sideways im like what? she says "I saw u kiss my man" i said he kissed me she got all mad we got in a hugh fight and she left.  couple days later im on a popular website and i see his pic requesting me as a friend so i approved it and we started chating I dont know what happened but one night he wrote me saying all the dirty shit he wanted to do to me and by then my sis had broke up with him so i said wtf im fuck his sexy ass we met up at his house that night and when he opened his door he was buck naked big dick hanging out he says take that shit off(my clothes) so i did just that!!! that man fucked my pussy in every position possible even upside down no joke. it was the best sex ever!!! after that night we had sex a few more times we were so hot for each other we couldnt keep our hands off.  after a while I started to feel guilty so I stopped but let me tell u Im over that guilt now.  She was always a fucking ungrateful bitch!!