User blog comment:IamJakuhoRaikoben/Chapter 456: Order, Review./@comment-67.5.245.122-20151012000216/@comment-23853100-20151012060153

I think the issue is your comparison is very weak. First off, Natsu and Lucy's relationship is nothing like Zeref and Mavis' relationship. Zeref and Mavis took on the same immortality, life taking curse and solitude even if it's only for a year. Natsu and Lucy doesn't have any of those similarities, Natsu and Lucy are always surrounded by friends.

If you ask me, your comparison on the couple thing makes zero sense, in fact, your comparison shows more towards the bond between the Dragneel brothers, Zeref and Natsu. Zeref is like the complete opposite of what Natsu represents.