Delphine, a mature woman with a penchant for the forbidden, finds herself alone with her stepson, both yearning for a connection neither can admit. She begins to masturbate, her moans echoing through the empty house, hoping he'll join her. He does, tentatively at first, then with growing enthusiasm as she guides his hand to her wet pussy. They explore each other's bodies, their taboo lust growing with each touch. But just as they're about to cross the final line, a noise from outside breaks the spell, leaving them panting and frustrated.