his is a story about a M girl with a strong sexual desire and a hidden M girl's herbivorous boyfriend-kun S-ization training story! The two, who have the same sensibility, naturally became romantically involved and lived very nice and fulfilling days. Her herbivorous boyfriend gradually calmed down with sex, while her sexually active and M-oriented girlfriend calmed down her frustration by masturbating, but one day, she decided to demand hard play from her boyfriend... She gradually started demanding hard play as if she was trying to nurture the "male" inside of him... and then... And gradually, her boyfriend also gets into hard play. ......