Feast

Masayuki and Kyoko's bodies had both started to age to the point where they no longer experience sexual passion. They are a couple that shares the same bed while finding separate pleasures with their own sex toys. Masayuki was always reminded that his true understanding of love came from his high school ethics teacher and that teacher's wife. The incident occurred when Masayuki was only 17. When he became alone with her he impulsively craved her body, only to notice that on the other side of the sliding paper screen... (Shochiku)