Under the cover of darkness, these siblings succumb to their primal urges. She sneaks into his room, finding him asleep, his boxers tented by his erection. She can't resist, stripping off her pajamas and climbing onto the bed. He stirs, waking to find her rubbing her wet pussy on his hard cock. They're lost in their forbidden lust, their bodies entwined, their moans muffled, until a creaking floorboard outside his door threatens to expose their sinful secret.