@Someone2Love
I agree that it's weird. But like it was mentioned, they're like two years apart. So it's this weird situation where position wise, it's utterly weird but in terms of general relationship potential (I can't find the right word for it) such as age, compatibility, chemistry, it's very normal. Not only that, it seems to imply that she never had any sort of physical relationship with her husband (he literally married her due to potential skills to protect his family and now as an actual wife), so it won't be weird either in that aspect.
Basically, it's a weird situation and I don't know whether to root for it or not. If they go for it, I'm fine with it. If they don't go for it, I'm fine with it and is understandable.
EDIT:
@Roiya I want to know as well.