Yes it has happened before. I let another guy hit on my girlfriend. I introduced my beautiful half Russian girlfriend, Sasha to my childhood friend called Adam. He was a bullied thin child but he grew into a muscular and tattooed, goth-ish like guy.

It was my birthday party.

He knew that we were in an open relationship with Sasha. He couldn't take his eyes off her. I let him know that he could join us for the night if he wanted to. He did.

One our later we fucked Sasha in a threesome in our bedroom. First we undressed her and fingered her pussy while making out with her. It was hot to feel another man's hand next to mine at my girlfriend pussy. She was soaking wet. If I rubbed her clit then Adam fingered her pussy. And if he rubbed her clit then I fingered her pussy. And it was also hot to see them kiss. The sight of Sasha letting him put his tongue in her mouth was oddly exciting. Then she kissed me with my friend's saliva on her lips.

My dick was rock hard already and Adam's too. Sasha started to suck my cock first. But in the meantime my friend snuck up on her and sticked his dick into her pussy from behind. It was such a sneaky move from him. He actually fucked her so good that in about two minutes she had a quick unsuspected orgasm. I remember how surprised and excited she looked. Then my friend kept on fucking her for a very long time. And she enjoyed him so much that she couldn't concentrate on my cock anymore. So I actually ended up jerking off while watching them fuck. Adam absolutely hammered her. I remember the moment when he spanked her on the ass so hard that the whole room was echoing from the sound his palm made on her pass.

I saw her orgasming a lot from my friend as they kept on fucking. It's like he knew the "orgasm button" in her pussy. And he fucked it endlessly.

I could join for a few minutes. She was riding me while sucking my friend's cock. He stole the show again when he whipped her ass with his belt while she was still riding on my dick. But then he grabbed her and took off her from me and started to give her a good fucking in doggy. She had another huge orgasm and that made us cum at the same time. We let out a huge shut together as I came in my girlfriend's mouth and my friend came in her pussy.

We fell asleep on the bed all three together.

Guess what was waiting for me when I woke up.

He then