I honestly don't mind the incest, I enjoyed it very much in their past life, but it's a plot device that is bound to be tragic in my opinion, no one will ever accept that, think it's normal, etc. It might happen here because it's BL, obviously, but I think they deserve better than that, they deserve a life they can love each other as freely as possible. So as much as I love their story, they're probably my favorite couple, I just feel extremely sad when reading it
Loved to learn a bit more about Ein's past