User blog comment:IamJakuhoRaikoben/Chapter 373: Life or Death?, Review./@comment-5840892-20140228175138/@comment-4999650-20140228191520

Well I mean, it sounds weird enough for Silver to be Gray's father since he's from Zeref's book. Same concept here, I guess. E.N.D being a demon from Zeref's book and also a parent... some odd stuff~