Recently, Mari has been unable to sleep due to frustration. She hears a noise coming from the ceiling, so she peeks into her son's room on the second floor and finds her son masturbating with a butt plug. Seeing this, Mari becomes turned on and starts rubbing her crotch. One day, Mari tries to relieve her frustration by masturbating, but her son finds her. Her son gets excited at the sight of Mari's big butt and hugs her. Wanting a cock, Mari accepts her son. A mother shakes her butt and climaxes over and over again...