I was balls-deep in my girlfriend's mom, pounding her ass like there was no tomorrow. Suddenly, the door swung open. My girlfriend stood there, jaw on the floor. Her mom and I froze, but it was too late. The look on my girlfriend's face was pure rage. She screamed, "What the fuck?!" as her mom scrambled off my dick, shame-faced. I was busted, and there was no way out of this mess.