The term 'godly' is highly subjective; therefore this is not a recommendation list. However, you are free to read what I have listed in here and I cannot stop you from viewing this list. This is a list of mangas that I think highly of , such as the storyline and character development. I won't say that these are my favourites, but I do think they are really really good stories. This list contains mainly seinen mangas.
There is no particular order.
୧••୨ ========== Feel Free To Suggest Anything==========୧••୨
List consists of mangas whose theme is incest & includes all sorts of relationships -
Brother X Brother
Brother X Half-Brother
Father X son
Step-Father X son(reverse)
Cousin X Cousin
Family X family
I will not add those mangas where they have feelings for family member but there is
no development i.e. no confession & no sex
also, plots where they are brought up together but not linked by blood or law.