Slept with sisters girlfriend

My sister finally came out as a lesbian about two years ago, and now has a serious girlfriend. My sister believes that she only likes girls, but I found out she is bi. We both still live at home, and after they came backe from a night out, I got in to a drunken conversation with the girlfriend after my sister fell asleep. Don't know why, but I asked her about coming out a lesbian, and whether she had ever been with a guy. She said she had, and used to be straight, now she is bi. I was supprised as my sister had always said she was a lesbian, to which she said my sister didn't know.
As I was drunk, I didn't leave it there, I asked her if she missed c***, and again supprisingly she said yes, so I offered my services if she ever needed them.
She glanced at my sister passed out, got up and led me upstairs.
We got to my bedroom, and she said let's do doggy and be quick, I don't want your sister to catch us. She bent over the bed and waited. I lifted her skirt to reveal her pert ass and a white thong with a wet patch. I concluded she had be ready for s**, but with sis asleep, she needed something else. I quickly dropped by trousers and fumbled about for a condom. 'not something I normally have to worry about' she said. I slipped the thong aside and slid into her. She was tight but very wet. I went quite fast on her, banging her quite hard, but she seemed to love it and was soon making the right noises. I had to pull back to avoid c****** first, then went again once it had died down. She seemed so close, but so was I again. Finally she came, and so did I, so glad I held out.
Afterwards her p**** looked so creamy and well used lol. We cleaned up, and she went down stairs to wake may sister and take her to bed.

Not sure what to do now. I so want it to happen again, but how bad would it be to find out your girlfriend was cheating on you with your brother? Feel conflicted, welcome advice.

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  • Hot story!! Lucky guy

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