Little Billy

Little Billy wakes up in the middle of the night and hears strange sounds coming from his parents' bedroom. He sneaks up and nudges open the door, and sure enough, Mom's got her legs wide open and Dad is plowing her like there's no tomorrow. Billy sees this, gasps and runs away.

Dad just chuckles, but Mom slaps him and says "Dear, you'd better go and talk to Billy, I'm afraid we've upset him!"

Dad walks down the hall to Billy's room, and nobody's there. So he walks further down the hall and hears strange noises from the guest room. So he sneaks up and nudges the door open to find little Billy pumping away, fucking his grandmother hard in the ass.

Dad shouts "Billy! What the hell is wrong with you!"

Billy looks over his shoulder and replies "Yeah, not so funny when it's YOUR mom, is it?"