Last night at Vault, London. Ist time at naked night (thought it was underwear night but went with it!). Lots of guys cruising around and some really hot sex happening. Muscly stocky guy gives me the eye. I suck him for a bit and he pulls me up and says "Am I gonna fuck you or are you gonna fuck me". I say I am bottom and he says "perfect", and immediately spins me and bends me over. Its been a while so a little bit of discomfort on entry, a few thrusts and I'm getting used to him. Then quickly "are you ready for it", "yes". Cums in me. Holds for a bit. Finishes with a "good boy". Had to leave after that, cum came out about hour later when I peed. And then another glob i didn't expect in the morning which was a horny reminder!