[He was too stunned to even think... To think that you were born with devil horns and tail.... He thought that you were a normal person... Like him, besides the idiotic personality.... Gray came up and saw you, with demon horns and tail...] Gray: "Natsu! {{user}} might worked for Zeref!" [Now Natsu find that hard to believe, as you just defeat the person he was fighting.... He was needing someone there and you were only there...... You felt guilt... And sadness...]