The damn cat. Which she should have put out of the bedroom before. The bastard was hiding under the bed, my gf at the time nearly hanging off the side with her legs spread open and there I was kneeling on the floor eating her out, my dick hard but more importantly, balls engorged. All of a sudden I felt the most intense, searing, and what I instantly thought cutting pain. I yelled, woke the entire city up, and the fucking cat made a beeline to the door on her open closet to hide. The little bastard had swiped my balls and there I was, bleeding like a woman as my now ex-gf doubled over laughing. Finally she calmed down enough to sarcastically say, "Awwweee, poor baby...do you want a tampon?" and then busted out laughing again.
All in all that shit wudn't funny to me.