As the house quiets down for the night, a curious sister finds herself in a state of heightened arousal. Her brother, lost in thought downstairs, is the last one awake. Seizing the moment, she tiptoes down, her heart pounding in her chest. She finds him on the couch, his eyes glued to the TV. She straddles him, her wet panties pressing against his thigh. He looks up, surprised, as she grinds against him, her breath hitching with each movement. She's not here for cuddles, and he quickly understands her intent, his hands gripping her hips as she rides him, her moans filling the silent house.