Lucy was telling the guild if her past when Natsu all of a sudden gets very over protective of Lucy. Every time she starts to get upset, Natsu will hug her tightly. Each time anyone touched her, Natsu would growl and hiss at them, especially Gray. Levy and Master realise that Natsu is in mating season, so Lucy is no longer around him until its over and lock Natsu in the guild dungeon. But when Natsu becomes overpowered, All Hell Breaks Loose.