Prologue

(Please forgive me if I mess some of the grammar is wrong or names of characters it has been awhile since I watched the anime and this will be my fist story written)
What if when Natsu killed Acnologia Natsu gained his powers to transform into a dragon but had his sanity intact so he didn't kill without reason, then when he got said powers he became the king of dragons and the fire dragon king read to find out what happens to Natsu and the guild.