Full disclaimer, this was a while ago during my 20's where I was really experimenting,

I used to fuck my housemate at the time very very regularly. We were hooking up quite regularly, had absolutely no interest in any sort of relationship, and the dick was good. We were unbelievably horny, fucked like rabits, basically anywhere in the house (this became a challenge) and he didn't mind me seeing other people, which I did, loudly (he loved this, of course)

One of the "other" people ended up being another regular guy. After I fucked him, my housemate asked me how big his dick was, which in itself was a huge turn on for me, just the idea that we had basically just fucked the night before and i was telling my housemate how this guys cock was deep into my mouth. I loved being so free and open with the details. I still do.

The "regular" I had would come over, fuck me senseless, blow his load over my tits, leave, then I would shower and fuck my housemate after. The regular guy had no idea, We both loved that this was happening sort of behind his back and at the time, we were young and carefree and felt invincible so just kept it going.

Once, I let Mr Regular blow over my tits, as usual, then when I went to shower, I would drop into my housemates room to flash him what's happened to me, then go for my shower.

Happy times.