In the dimly lit hallway, the siblings' eyes meet, a silent understanding passing between them. They slip into an empty room, the door clicking shut behind them. The sister, her heart pounding, reaches out to touch her brother, tracing the lines of his chest, her fingers lingering on his hardening cock. He responds in kind, his hands roaming her body, finding her wet and ready. Their breaths grow ragged as they lose themselves in their forbidden dance, their bodies moving in sync, their moans muffled by the thick walls of the old house.