In this adult sibling role-play, I constantly spy on my sister while she masturbates. Watching her play with her nipples as she pleasures herself is irresistible. One day, I catch her rubbing her clit with the ocarina I gave her, and the sight makes me instantly rock hard. So that is how my gift became her sex toy—and how she uses it to get herself off. Her brother watches with his cock already slick with precum.