In the dimly lit room, a brother's curiosity piqued as he notices his sister's friend sleeping peacefully. Seizing the moment, he unzips and pulls out his throbbing cock, wrapping it in a glowing, glow-in-the-dark condom. The contrast of the vibrant color against his skin sends shivers down his spine as he strokes himself silently, his eyes never leaving the sleeping figure. The tension builds as he fights to keep quiet, the glow intensifying with each pulse of his heartbeat.