Two years ago, I lost my job and, as I don't get on with my parents, ended up staying with a friend for a few months. She didn't have a particularly large flat, just a kitchen, bathroom, lounge and one bedroom, so I had to sleep on the sofa bed in the lounge. Practically every night, she and her boyfriend (who lived with her) would have pretty loud sex. I could hear everything; headboard creaking, the slapping of their bodies coming together. The weird thing would be her moans. She'd moan "i'm sorry" a lot, which always confused me. Anyway, I became pretty obsessed with both of them. I'd go through her drawers when they left for work, and lay on the bed with her underwear wrapped around my dick. One evening, they were in the kitchen. She was cooking, and she had this short beige skirt on. The lounge and kitchen were on opposite ends of the hallway and with the doors open, I could see right through. She was cooking, and he was behind her, one of his hands up her skirt, rubbing her. The next morning, after they left, I went straight for the laundry basket and stole her thong. I used to put it over my head and sniff it while jerking off. About a week later, she confronted me about where it had gone. I said I didn't know but she didn't believe me and started going through my stuff. Needless to say she found it. She said I was a sick fuck, and told me I had a week to move out. The next time they had sex, I heard her mutter "be quiet, I don't want [my name] to hear.". So I crept right up to their bedroom door and listened in. We haven't spoken in the two years since i moved out, but i think about it all the time. I'd give anything to hear her fuck again, or watch her get fingered, or smell her used underwear. I know, I'm sick, but she made me so horny.