a couple of years ago i went to visit my (then) boyfriend at his apartment. we were in his room and things started to heat up, and the next thing you know, he's got his pants off, i've got my shirt off, and he's sitting on the edge of the bed with me kneeling on the floor giving him head. all went well throughout, until the instant he came and i started to swallow. that was when his roomate decided to walk in to the room to ask him a question. i'm surprised, so i involuntarily make a sharp inhalation. this is not a good idea with a mouthful of cum. i start gagging and choking and coughing all over the place, while his roommate just stands there staring at us until ian yelled at him to get the fuck out.
we broke up shortly after, for unrelated reasons, but i never did feel comfortable going back to his apartment while his roommate was there.