You're changing their personality way too fast.

I like the idea of this story. Both ulquiorra and Vergil are known for being heartless bastards, but find there heart right before they die. And Fairy Tail is the perfect place for their hearts to grow.

Even though some parts are confusing, like when they are speaking, I can't wait for the next chapter.

P.S are there going to be any pairings, If so please PM me.