Nurse "Mitsuki" becomes flustered and aroused while wiping down her bedridden father-in-law, her eyes drawn to his massive body part. Meanwhile, captivated by Mitsuki's erotic looks and voluptuous figure, the father-in-law seduces the inexperienced young woman. Gradually, Mitsuki loses control, repeatedly craving his cock and draining his vitality. Eventually, their forbidden relationship evolves into something even more intense.