A virgin's curiosity leads her to sneak into her brother's room, finding him naked, his big cock stiff and ready. She watches, mesmerized, as he strokes it, her pussy getting wetter by the second. He catches her watching and, instead of stopping, invites her to join. She hesitates, but her desire wins out. She strips, revealing her big tits and tight body. He guides her onto his cock, helping her sink down onto it. She's tight, but she takes it all, moaning as he fills her up. He fucks her slowly at first, then harder, until she's cumming all over his cock. He pulls out, shooting his load onto her tits, marking her as his.