I \[M28\] have been with my girlfriend \[F27\] about a year. She is honestly an amazing catch: just a really kind and thoughtful person, a 1st grade teacher, and just a ton of fun. She is a cute brunette, likes to run but isn't really the gym type. She is kinda of the type that you secretly have a crush on, but not the one that a group of guys is gushing over. Well, I had a crush on her, asked her out, and a year later, here we are.
We have an active sex life. She isn't kinky necessarily, but she has a high sex drive and is always willing to try new things out.
I live with a roommate in a two bedroom apartment. My girlfriend lives with two other women in a three bedroom house, but she typically stays over 3-4 nights a week, and is therefore at my place a lot. She gets along really well with my roommate, who is a guy I knew a bit in grad school. He is a nice guy...we aren't close friends but we hang out together at home. He is pretty shy, and he has not done well on Tinder or the other dating apps. So it has been awhile since he has brought a woman over to our place.
So a few weeks ago, me and my girl were laying in bed, pre-fooling around, and got to talking about fantasies. Talk turned to threesomes, and I said i would be cool with either arrangement if she was into it (FFM or MFM). She was surprised, and started asking about whether I would be jealous. I am really not the jealous type, so I swore it wouldn't bother me to see her with another man, if it was consensual for both of us. She kept pressing, and so I finally said "you could walk across the hall and fuck Tyler right now, and as long as you came back to me, I would be fine." She was in disbelief, and kept asking me if I was serious. Finally, I was like "if you are so curious, try it." She was still in shock but then I was like "seriously, it would be hot." And she finally was like "fuck, that would be hot. but are you FOR REAL serious?" My heart was thumping in my chest but I just nodded. And she was just like "fuck it, this is going to be interesting." And she climbed out of my bed.
She walked out of my door, only wearing one of my tshirts. She left my door open, so I could hear her knock, then him answer and say "what's up?" And she said "ok so I know this is weird but \[TheGreatRoommate\] said I could fool around with you tonight, and I know you have been \[laughs\] umm not that lucky lately." I heard him kinda hem and haw and she was like "im serious. ask him." And then he called out "uhh dude are you hearing this? Is this for real?" And I just called back "yep. enjoy man, just send her back when you are done."
He shouted "ok sure!" and then I heard his door close. My mind was racing, and I was dying of curiosity wondering what was happening. Then maybe 10 minutes later I heard her moan. Like the moan I know well. He was fucking her. Holy shit. I jumped out of bed and snuck in the hall so I could hear better. I just heard her moaning "oh fuck oh fuck oh fuck" and the sound of skin slapping skin. I listened for awhile, and then I heard her voice say what I think was "lay down" and then a pretty loud grunt from him. And at that point I knew she was riding him. A short while later, I heard him go "ohhhhhh fuck" and I knew it was ending so I rushed back to my bed.
A couple minutes later, I heard the door open and my girlfriend came tip toeing back into my room, nervous smile on her face. She shut the door, and lay down on the bed. I just said, "you actually did it, you little slut." And I pulled the tshirt she was wearing up to her waist, and...well it was a pussy that had just been fucked. I asked "did he wear a condom?" and she nodded. Then I made eye contact with her, and she knew what was coming. I slid so easily inside her, but it was maybe the best, most passionate sex I have ever had.
She has had sex with him twice more since that happened. She says she thinks its a bad idea to make it a regular thing, but she also admits she loves the idea of going from room to room, getting fucked by multiple guys. Now that the school year has started, she is busier anyway, and I'd imagine it would be exhausting to teach all day, then have to satisfy the sexual desires of TWO men.
For my roommate's part, he has expressly thanked me, and said that its actually given him way more confidence with women in general.