Fukou na Kaa-san to Shiawase Love Love Seikatsu

My father..."That man", committed domestic violence.To run away I lived by myself for a few years while becoming a college student,and I had to take custody of my mother."That man" had found a woman and thrown her away.When my mother arrived,her body and heart were both exhausted,she couldn't sleep at night,and couldn't hold a proper conversation in her depressed stateLiving together,he heart started opening up bit by bit,but my mother having suffered "That man"'s abuse ,had changed.Even though she was so cheerful and bright.She started to pander to me while being scaredNot wanting to be thrown away by me,she starting to cook,clean,and wash my back in the bathroom.The acts escalated,and to relieve my sexual urges,she even said she will give me a fellatio.If I refuse here,her heart might close again.And also....my mother is too attractive...I might lose to the temptation.I want mother to return to her kind and cheerful self.I want to become happy together.What should I do?[translated from Dlsite]