She could hear the noise her pussy made when his cock pounded into her, and it was driving her crazy. Her hips moved, grinding against his pelvis, desperate to feel him more, the head of his cock rubbing roughly against her g-spot. She cried and whimpered, convulsing as orgasm took her, eyes going wide in shock, when she felt herself release, squirting for the first time, hot, bathing her brother's cock in wet arousal. It dribbled out of her pussy, and over his balls. She didn't know that kind of thing was possible, and her face was red with embarrassment as she met Sengo's eyes. "W-what-?"