Hearing the people upstairs.
About a year ago I moved into an apartment with my buddy and his girlfriend.
Everything was great, but one day the people above us moved out, and a couple with two kids moved in. They are horrible, always yelling, swearing, stomping their feet and this goes on at all hours.
One night, about two weeks after they had moved in I was woken up because everything in my bedroom was shaking, and my walls were vibrating. The couple above us were having sex! Their bed was creaking and I could clearly her moans through my ceiling. I became rock hard in an instant and began stroking myself to the sound of them getting it on. Her moans kept getting louder and louder and I realized I could even hear it when they switched positions.
I closed my eyes picturing myself being the one that was giving it to her this rough, and just stroked myself to the intense rhythm of their sex. It lasted about half an hour, but I still wasn't done. I turned on the porn that I already had in my DVD player and finished myself off before going back to sleep. This has happened dozens of times since
and every time I have one of the best orgasms of my life.