Rin lost her husband two years ago and lived with her husband's daughter. Now my daughter is married and lives with her husband and wife. I'm not lonely these days, but I missed human skin. One day, my daughter and son-in-law were wandering around in the living room. Rin masturbates while looking into it, but the thickness of his fingers is not enough. One day, I have an evening drink with my son-in-law. The son-in-law knocked down the glass and spilled alcohol in his crotch. Rin hurriedly tries to take off his pants and notices his son-in-law's erect penis ...