Two siblings, bound by blood and forbidden lust, sneak into the attic to indulge their taboo desires. The brother, a strapping young man, lifts his sister onto the old, worn-out sofa, her legs wrapping around his waist. His hands roam her body, squeezing her firm breasts through her thin nightgown. She moans, arching her back, pressing her wet pussy against his hardening cock. He lifts her nightgown, exposing her naked flesh, and buries his face between her thighs, licking and sucking her clit until she's writhing with pleasure.