In the cramped bathroom, Sis can't keep her hands off her brother's virgin cock. She's a naughty little thing, always eager to taste forbidden fruit. She strokes him, feeling his length grow in her hand. He's nervous but excited, his cock throbbing with anticipation. She leans in, taking his tip into her mouth, swirling her tongue around it. She can feel him pulsing, ready to explode. She takes him deeper, feeling him hit the back of her throat. He grabs her hair, guiding her, and she loves it. She's his now, his to use, his to fill with his hot, creamy load.