Rika Fujishita lives alone with her son, her husband having passed away long ago, and they've been living a peaceful life together. As the years go by, her son increasingly resembles her late husband—especially in the size of his massive cock. Rika finds herself unable to look away, gradually losing the ability to see her son objectively. One day, overwhelmed by her own uncontrollable sexual desire, she begins masturbating him under the pretense of maternal care, using his huge dick to satisfy her own needs. Driven by insatiable lust, despite knowing it's wrong, she ends up having sex with her own flesh and blood. This film captures, with digital precision, a forbidden night of taboo mother-son intimacy.