Honoka, who is frustrated by her husband's neglect, can't help but get turned on by the sight of her only son, Satoshi's, sturdy penis. Driven by her burning sexual desire, Honoka narrows her target down to Satoshi, showing off her proud breasts without a bra and gradually seducing him. Confused and running away, Satoshi loses his senses when the big breasts are presented to him. The mother-son sex begins, with both of them refusing to let go until they're satisfied!