Secret kissing affair between a father-in-law and his wife

Yuna comes to her husband's parents' house to visit his father-in-law Toru, who was injured in an accident. Yuna wanted to encourage Toru, who has not been healthy since his wife lost five years ago, but one day, while he was helping out with a bath, Toru pushed him down. Yuna is scared and resists her first orgasm, as she licks her lips and tangles her tongue, and the intense kisses of genitals while making obscene sounds. Toru hides her son's eyes and attacks Yuna's sensitive body with her lewd tongue...