Just me rating the ships because it needs to be get out there-
Warning though, I do mention some Manga and anime spoilers if you have not watch the full thing or read the manga
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------ 2/10 ------
Ummm no...
Couple of reasons, age difference, adult and minor. 4 year age difference is not terrible, but like in another way, it kind is when it's comparing an adult to a child. Besides minors and shit like that, I don't think this ship is terrible, I think it's somewhat cute but hey! I see the two as sisters, nothing more, Nezuko even states that.