A boring teacher's father who uses a dad-activity app to relieve his worries. One day, I happened to meet a girl who turned out to be my former student! When I met her again for the first time in a long time, she had grown into a sadist who held on to her weaknesses and bullied her, saying, ``If you don't want to be exposed, listen to what I say.'' She begins to feel pleasure in the days when she is made to ejaculate forcefully, and she is at the mercy of the techniques of an aggressive slut!