My First Time Was with Mom... Ayaka Muto (2015)

The movie explores the complex and taboo relationship between a mother, Ayaka, and her son, Hayato. As Hayato struggles with his own insecurities and feelings of inadequacy, he finds comfort and solace in his mother's care, which eventually develops into a romantic and intimate connection. The story delves into the emotional and psychological dynamics of their bond, navigating themes of family, love, and societal expectations.