A few years ago I was living in an apartment building with VERY thin walls. My next door neighbor was a dude a couple of years older than me. He looked kinda like a busted Henry Cavill, with a great body though, since clearly he worked out. Anyway, every weekend his girlfriend would come in and they would have the loudest sex, and their bedroom was next to mine so I could hear EVERYTHING as if I was standing in the room with them.
The girlfriend was vocal and dirty, she'd be like, "Spit in my mouth, papi, spit in my pussy, I love to suck those balls, that big dick feels so good", etc, and she'd have the LOUDEST orgasms I've ever heard, like sometimes you could hear her moans and screams from the other end of the hallway outside, and his moaning when he came wasn't that far behind. I could hear the springs of the mattress and the headress banging the wall super hard, he'd give her a good pounding every time.
Anyway, one day I was picking up something from the floor near the wall and I discovered a tiny hole that let me see right into their bed! I couldn't see everything, unfortunately, but I did see her riding his dick, she had an amazing, fat ass. He moved out soon after but they gave me plenty of good wank material.