The daughter-in-law has decided to live with her father-in-law in order to take care of him. One day, while wiping her father-in-law's crotch, she is captivated by his gradually growing penis and becomes excited. After that, the daughter-in-law picks up the underwear her father-in-law has taken off and starts masturbating. The father-in-law, who has been watching, can no longer contain himself and embraces his daughter-in-law and caresses her. And the two of them cross the line...