A female college track athlete reveals her big tits inherited from her mother and her soft, voluptuous ass peeking out from her training wear. Under the guise of coaching, her stepfather—her mother's remarriage partner—gradually drags her into a lewd relationship. He touches her body under the pretense of stretching, forcefully invades her during bath scenes, and his lust never stops. Ultimately, she can no longer resist the pleasure and falls into a deeply depraved relationship with her stepfather.