My gf and I were having a threesome with a guy we had done it with a few times before. He was bi sexual but he knew I wasn't so respected that boundary.

We were fucking her together I was under her she was reverse cowgirl on top my cock in her ass he was on top of her fucking her pussy. She then took his cock in her hand and guided it to my ass and told me to relax, I went along with it and he pushed his cock into my virgin ass her pussy juices was enough lube and it slipped right in. It felt surprisingly good and he began fucking me harder and harder. His cock in my ass as mine was in her ass. It felt so good I ended up cumming in my girls ass and he came shortly after inside my ass. It made my gf so horny watching me get fucked she sucked both our cocks clean.

Didn't think I'd enjoy it but I did