Housewife Mikako Ootaki grows closer to her son while her husband is away. Her son's desires intensify daily, increasingly fixated on her groin and anal scent before baths, making her lick and smell it. His obsession escalates—urinating on her, inserting fingers into her anus. Eventually, Mikako defecates massive amounts onto her son's face, developing deep affection for the child who willingly accepts her filth. While her husband sleeps, the pair forge an even deeper bond through repeated anal intercourse. This intense tale of love and obsession centers on taboo parent-child scat and fecal fellatio.