My girlfriend at the time had a guy (Let's call him K) that we were hanging out with one day. K and I were tossing a football back and forth, and he started smiling as we did. I didnt think too much of it at the time. Later on my gf asked if I would be interested in having a threesome with K. I remember the smiling and said, "Oh, so that's what K was smiling about". He probably thought I would be into it, which intrigued me.
Some time later I learned that K was her ex, although they have mostly been friends with benefits. This is where I asked how big was K's dick, and my gf said about the same length, but thicker. My dick is 7.5" full grown with some curve.
It took a while for intrigue to turn into a yes, and actually warming up to something actually happening. Over this period of time the 3 of us hung out together with the intention of it happening. We all took turns being way too drunk/high for it to happen.
One evening, after hanging out all day, we get back to our apartment and I feel like it might be time to see what the hoopla is all about. I put on a playlist to get us in the mood for this occasion. Me and K dance around my gf, she starts touching us and feeling us up while we feel her up. She pulls my dick out first, then his. K was already hard and his dick pointed straight forward and slightly up. My gf is taking turns blowing us every 20-30 seconds, and I am really hard by this point as well.
We decide to change positions and I start licking my girlfriend's pussy. K starts to titfuck her and I hear sucking sounds from my girlfriend's mouth. She was sucking his dickhead every time it poked above her double GG breasts. I was getting really turned on by the action and quickly became a fan of threesomes. Soon after this I started fucking her right then and there. She was still sucking him and I came inside her.
Now it is K's turn to fuck, and he sits on the couch, and my girlfriend sits right on his dick. She was so wet, she slid up and down K's dick fairly easily. In this cowgirl position, I could see his dick was pretty thick from tip to base, and the thickness pretty much filled my gf up. In this moment I had the sudden urge to lick my gf's clit. In this process, I ended up liking some shaft as well. My gf came so hard from all of this, and he came a lot. When he pulled out, his dick was still pretty hard and the condom tip was full of his cum. My gf pulled the condom off, sucked him off and I decide to lick her pussy again. K decides to fuck her from the back while I am still down there. Watching close up fucking with the balls slapping, my gf started sucking me as well. I got so hard and turned on. We all ended up cumming in that position.
I was left very impressed and turned on by our session. We would continue to hook up many times until K got married to his gf. I didnt know what he saw in her, she was not attractive to me at all, so I never cared to ask for a 4some. This gf/wife of his didnt like him hanging out with my wife, but figured nothing to worry about if I was there too .
I was never worried about them getting feelings for each other. K was good at fucking and being friends, but him and my gf were incompatible otherwise. I learned a lot of pointers from our sessions together. Thanks K! Also realized thatI love women, and also interested in dicks.