Under the same roof, siblings find solace in secret masturbation. She, in her room, slips a hand beneath her pajama shorts, imagining someone else's touch. He, in the adjacent room, strokes his cock to thoughts of her. One night, he hears her soft moans, follows the sound, and finds her in the throes of pleasure. Startled, she freezes, then invites him in. Together, they explore each other's bodies, their breaths ragged, until they're both on the brink. But a creaking floorboard above them reminds them they're not alone, and they pause, hearts pounding, before retreating to their separate rooms.