Sergi's curiosity gets the better of him as he explores his sister's personal belongings. Her scent, still fresh on her discarded panties, sends a jolt of lust through him. He can't help but press the damp fabric against his face, inhaling deeply. His hand finds its way into his own pants, stroking his hardening cock. The taboo nature of his actions only serves to fuel his desire, his mind racing with fantasies of his sister, her body, her moans, her pleasure. He strokes faster, his breaths coming in quick gasps, until finally, he finds his release, his sister's panties sticky with his forbidden desire.