After a mistake at work earns him a week-long suspension, an adult virgin returns to the family home where his brother and sister-in-law Kotone live. That night he secretly watches Kotone suck his brother’s cock, her sweaty huge breasts bouncing as she licks with a hunger he never imagined beneath her usual kindness. The filthy sight refuses to leave his mind. When he finally looks up, Kotone is already smiling knowingly at him, ready to take his virginity herself.