The love between mother and son begins with kissing, close contact, intense sex

Today, Yumi is working with her husbands at a small local factory that has been supported by a couple and several employees. Recently, my son Satoru helped me out at the factory, and everyone around me seemed like a very close parent and child. However, Yumi and Satoru were in a forbidden relationship where they were hiding from their father and in love. The two become obsessed with the "pleasure of immorality" that no one should ever find out, and their obscene acts escalate in search of thrill and pleasure...