Young guy gets a surprise while masturbating in front of his sister

A youthful guy, with an insatiable lust for his sister, surreptitiously indulges in self-pleasure while she's away. He's a master of the art, his fingers dancing a rhythm on his throbbing manhood. Just as he's on the brink of ecstasy, his sister unexpectedly enters the room, catching him in the act. Her face, a mix of shock and arousal, only fuels his desire. Unperturbed, he continues his solo performance, his hand now working in overtime. His sister, intrigued by his audacity, decides to join in the fun. She reveals her alluring curves, a tantalizing sight that sends him into a frenzy. His hand quickens, his breaths growing ragged until he finally releases, filling her panties with his warm, sticky essence. The sight of her, drenched in his release, is the ultimate reward. This is a tale of forbidden desires, hidden voyeurism, and the thrill of the taboo.