Caught off guard, the sister's surprise visit turns into a heated exchange with her brother. As they argue, she can't help but notice his growing bulge. Defiantly, she teases him, fingering her wet pussy and moaning loudly. He can't resist, pushing her against the wall and roughly entering her. She gasps, feeling his massive cock stretching her tight cunt. They fuck passionately, their taboo lust consuming them, until they both explode in a frenzy of spent fluids and satisfied moans.