Unable to bear the loneliness while her husband is away on business, Fumiko ends up having a relationship with her only son, Tatsuya. She knows it's wrong, but she can't resist the pleasure. Then her husband's business trip comes to an end, and Fumiko has no choice but to put an end to this rotten relationship... Fumiko unilaterally announces that they are ending the relationship. However, her body has not forgotten the taste of Tatsuya. "Mom, can you really forget my dick?" Those words make Fumiko's resolve begin to waver...