In high school my best friend had been dating a girl a few years older than us that was bi, and a total slut. The type of girl to get gangbanged at a house party while being sober.
My friends parents would only allow girls in his room if I was there, thinking that he wouldn’t have sex with me in the room… Well they were very wrong. He didn’t care if I watched and she liked that I did… One day they were in his bed, she was naked with her ass to me, blowing him and I was on the futon, cock out slowly stroking. My friend had his head back, eyes closed while she gave him sloppy slutty head..I had watched them fuck many times, always wanting to join but never asking. Well today, I couldn’t stop myself from walking over and getting on my knees behind her, thinking about nothing except how badly I wanted her pussy.. I started fingering her, 2 fingers at first then 3.. she moaned, looked back at me and smiled.. saying to me “couldn’t just watch anymore huh?” I just smiled and forced my ha d deeper inside her. My friend finally realized what was happening and said “if you want to that’s cool man, but just this once”
That was enough for me to get on my knees start fucking her slow and hard..
She got off the bed and onto her knees, opening​ her mouth.. we both moved over to her as she began sucking both our cocks, one hand on each.. neither of us cared that our cocks we’re touching, and being the bi guy I am I reached out and began stroking my best friends cock.. he looked at me quickly, then relaxed as he reached for mine..
After a few minutes of that, I got down with her and we both sucked and worshipped his cock and balls, she even rimmed and fingered him while I sucked.
When he was close to cumming we stopped and she got on her back, legs up in the air. He fucked her pussy and I straddled her and fucked her mouth… He came first, leaving a massive creampie in her pussy and I ate it up before she got back on her knees and I got behind her, as he got underneath to lick her while I fucked…I came a few minutes later and she scooped up my cum, showing it us in her mouth before swallowing it up… It was a bit awkward the first time we all fucked but after that day we all continued to fuck together until a couple months later when they broke up.
Source: reddit.com/r/gonewildstories/comments/6n4zqc/mmf_first_threesome_best_friend_and_his_gf
Did you and your friend keep playing after that?