My Stepdaughter in a Thong: Uncontrollable Desire to Stick it in Her Jiggling Peach Butt.

Koharu Suzuki stars as a bold stepdaughter who disrupts her new home by wandering around in nothing but a skimpy T-back. Despite his best efforts to maintain boundaries, her stepfather is driven to a breaking point by her constant, provocative presence and bouncy 'peach butt' (Momojiri). After a chance incident leaves them alone, the tension snaps, leading to a forbidden sexual relationship hidden from his wife. The film focuses on the intense immorality of their secret domestic encounters and his total surrender to her youthful, uninhibited seduction."