I've never thought of myself as a pervert but I jerk off to my flatmate fucking. It helps that he looks like a croatian tennis player. At the same time each night I hear his rhythmic grunting and the creaking of bedsprings. When he cums he sounds like he is in pain and that it requires real effort to force the juice from his engorged fuck stick. The girlfriend remains completely silent. The other night I overbalanced and fell loudly against the wall between our bedrooms. To my relief his rythmic fucking did not let up. I was even more relieved when the next night his fucking continued as normal. Last night was the best ever as the usual rhythm was replaced by feverish grunting and snorting, the sound of the bedsprings replaced by the sound of the frame of his workbench contorting as his thrusting intensified. For the first time I heard his girlfriend cry out "please deeper" and a muffled "yes" accompanied by long steady creeks as he ground into her finally shooting his load as he gasped "i'm cumming, oh god"