"Digoroludinho," the young man chuckles to himself, a secret nickname he's given himself. He's always been a bit of a dirtbag, but this... this is different. He's hidden away in his room, his heart pounding as he strokes his cock. He's thinking about his sister again, their shared glances, the tension between them. He knows it's wrong, but he can't help it. His mind fills with images of her, of her moaning his name as he fucks her hard, his fist working his cock with urgent need. He comes with a gasp, his body shaking as he tries to suppress his cries, his secret safe, for now.