User blog comment:IamJakuhoRaikoben/Chapter 450: Alone in all the World, Review./@comment-5668006-20150901040022

Actually to be perfectly honest, having Zeref fall in love this fast makes the most logical sense. He has been alive for 400 years and hated literally by every living being. In this time he has finally met literally one person, whom is a girl who is in the exact same shoes as him and she's showed him affection every time they've met. If he didn't fall in love, and wanted to take it slow that would make no logical sense, nor emotional. Rather, it wouldn't make emotional sense, logically - the only emotion someone could have in that situation is love, it's like a person who is blind all their life and has their vision restored. They will be overfilled with the chemical serotonin which = love. gg reality