There is an solution for your situation, but I don't think you will like it. For you it might be worse the cure that the sickness.
I think I know the work you are talking about, the guy came form an island where he left like 3 girls fawing all over him, and then put his hands on the mother of the house he was staying in?? I hated it as well by the way. I have a solution in mind for your problem but I don't think you would like it mutch.
My first NTR experience (and also my first hentai manga) is a tankoubon by the name Sougetsuno Kisetsu by Sanbun Kyoden. My mind is scarred forever.