Sticky Wife, Begging Wife III: Adulterous Wife Straddling 1997 on netflix

Eiji is the mistress of Nozomi, the widow of the company president, and if she asks, he will even ignore his wife Reiko. Reiko, who senses that her husband is cheating on her, also rekindles her lewd relationship with her boyfriend from college. The couple, who were supposed to be enjoying their own love affair, are faced with an unexpected turn of events…