Penny Barber, the raven-haired, curvy stepmother, finds herself alone with Billy Boston, her stepson, in the dimly lit family room. Her eyes flick to his crotch, where a substantial bulge tents his jeans. She shouldn't, but she can't help it. She straddles him, her big boobs pressing against his chest. Billy's hands grip her ass as she grinds against him. She leans in, whispering, "You're bad, Billy," before capturing his lips in a passionate, forbidden kiss.