My dad's new wife, Nami, is a beautiful woman closer in age to me than to my dad, and to be honest, I didn't know how to interact with her, so I spent my days feeling confused. Moreover, it seems that getting pregnant was a condition of their marriage, and she always wants unprotected sex on her ovulation days... but my dad can't keep up with her, so she's always frustrated. And Nami, who was tormented every time she saw my morning erection, finally...