Discovered: Brother's Solo Sin

In the dimly lit room, the brother's hand moves rhythmically, his breath hitching as he teases his sensitive flesh. The door opens, and his sister steps in, her gaze locking onto his exposed, glistening cock. She watches, intrigued, as he desperately tries to cover himself, her curiosity piqued by the taboo scene unfolding before her.

• jacking-off
• beating-off

• Unknown