USBA-045 Uniform bondage: The stepfather's punishment awakened the masochistic tendencies of innocent Sato

When tightly bound, the body becomes sensitive and gets wet from humiliation! The extremely evil penis of my stepfather forces open the pure petals! Is it because I saw my mother and stepfather's SM sex that this happened? Seeing my mother's blissful expression while bound, did I become interested in bondage and masturbate? During my mother's absence, I was scolded by my stepfather for peeking and punished. From that point on, the training progressed, and ののか fell into being a rope slave…