My girlfriend throws up after eating. I had begged her to stop, but she won't. About a month ago, after lunch she went into the bathroom. I crept down the hall to the door and listened. I could hear her throwing up, spitting & coughing, the splashing of the toilet water. My cock got so hard, I started jacking off right in the hallway (no one else was there). I have no idea what came over me, but now I jack off every time she throws up if I can, or if I can't while she's doing it, I go into the bathroom right after she's done and do it.

This is sick, I know, but I can't stop. What is wrong with me?