Rin has been widowed for three years... Worried about her elderly father-in-law, she has continued to care for him without any regard for remarriage. However, Rin is still young and in the prime of her life... and her body gradually begins to ache. And sometimes Rin begins to see the image of her late husband in her father-in-law, and even though she is old, she still desires his penis, which becomes erect while caring for him. Using the excuse of caring for him, Rin seduces him and begs for sex, and gradually she becomes so aroused that she cannot sleep without passionate kisses and caresses from her father-in-law...