I held my breath as I approached the door, praying to God that I didn't see what I knew I was going to see. I peered into the room and there she was, my future fiancee, on the bed that we shared every night. Under my muscular co-worker, Matthew. They were both completely naked, and she was moaning and wailing in pleasure as he made love to her, hard. Her pale, soft body under his hard one. They looked like they'd been at it for a while.