Daisuki na Haha 1

Every day, Miyuki strives to be a bright example of what it means to be a good mother to her son, Yutaka. One day, Masato, a friend of Yutaka's, has a different definition of a good mother in his thoughts, and he makes a move on her. While her son sleeps next to them in the same room, he takes her as his own. It wasn't until a day later that she was blindfolded, shackled, and forced to have sex with her son that she realised what was happening. What sort of a mother has she gotten herself to be...?