Grandmother Reiko Matsui lives with her son and grandson, her insatiable libido leaving everyone around her stunned. She constantly demands her son's cock, engaging in repeated incestuous acts with him. When her son goes on business trips, her desires turn toward her grandson—she lasciviously touches his young body, performs rimming and handjob to make his cock hard, then gives intense titty fucks and mind-blowing blowjobs leading to creampie. Still unsatisfied, the grandmother pounces on her grandson again, riding him in a vigorous cowgirl position that belies her age, taking his creampie deep inside her. Her depraved actions symbolize a three-generation incestuous affair.