[M] Overhearing my friend [MF]

The following is a story inspired by events from a recent trip to a friend’s place. Do note that the brazen nature of my friend and his girlfriend and the fact that they left the door open make it clear that they were cool with me overhearing this.

We had been drinking all night, my friend’s girl is petite so she’s easy to make drunk. They went to his room, I went to the couch, to go to sleep. A few minutes later, I heard some giggling from her. She asked “are you sure?” And then I heard wet/kissing noises for a few more minutes. Then a slapping/thud sound followed immediately by a high pitched gasp, clearly from her. The gasps became quicker and turned into cute/hot moans.

She’s clearly enjoying herself, her moans beginning to mix with heavy breathing. At this point, I can’t help myself, her sounds have me going. I quietly move nearer to the wall to his room. I hear him a little, mostly grunting but she’s so much louder and clearer. I hear her say “harder, fuck me harder” and “don’t stop!” After a little while with more moaning and “slapping” she says “my turn to ride” and I hear some rustling and the moaning returns.