User blog comment:LastationLover5000/Fairy Tail 301 - In Which Hiro Has Been Reading My Things (The Dragon King)/@comment-3030647-20120929000335/@comment-4666155-20120929002102

Lol my theory (posted it down there) is that only Dragon Force can truly make you become a dragon if you overuse it. And since Natsu and co. really CAN'T use it, their totes safe.

So...Acnologia is just the biggest bully on the playground