Can We Go Back To How We Were When We Were Younger?

So this book is originally by Red_Wolf_Huntress I just adopted this. And Wolf_Queen_101? She made the cover. If you have any questions, pm me.
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It was a normal day at FairyTail, when suddenly the doors were kicked open and there standing were 3 boys. And in a flash, they were all circling FairyTail's stellar mage, Lucy Heartfillia.

What happens?
What are they going to do?
Do they know Lucy?
And how?
But mostly, who are they?

Do you want to know?
Well then, read onto find out who they are and what connectiojs they have with Lucy.

OCxLucy. StingxLucy. GrayxLucy.