The son-in-law, who aroused his mother-in-law's lust, has an extremely high sex drive. (Mio Morishita SPRD-1066)

Mio Morishita, who lives a lonely life in the countryside, is persuaded by her daughter and her husband to move in with them. One morning, she suddenly notices an unexpectedly large bulge in her son-in-law's crotch, and then catches him masturbating...