A Dark Mage's Strongest Demon

Hundred Centures ago, there was a war, between the dragons, mages and other mythical creatures.
Long sinced the battle began, the war still has not ended. Zeref, one of the mages found a Demoness and together they fought in satisfactory to be able to see their ones enemies dead. The war raged as the years passed, Zeref and the Demon went to hiding, tired of fighting in the battlefield, they created more demons as time passed. Problem? The war is yet to come to an end in a sacred and secret place, in another universe, will Zeref and his Demons return to the battlefield?

What if Etherious Natsu Dragneel(E.N.D) wasn't Zeref's strongest demon, but 2nd strongest? What if Gray Fullbuster, FT's Ice mage-turned-Ice Devil Slayer is also one of Zeref's strongest demons tied and on par with E.N.D?

Meet Lucy Demon-Heart Acnologia, Zeref's strongest demon and Acnologia--The Apocalyps Dragon's daughter.

She has golden silk hair, dull sky blue eyes, big melons, and a model's body.

Gray and Lucy are special demons; They can change their appearance, they both have many familliars, and they both can change their eye colors according to their power and mood.

Lucy was sent to watch over tenrou island, where Zeref is currently sealed away. Natsu has no idea of this nor he knows that he's E.N.D, Gray on the other hand, knew all of this because of his mission to guard E.N.D.

When the S-class exams start, they went to tenrou with the guild, Lucy and Gray set off to find Zeref, and eventually found him. As they spent happy memories together, Lucy's father--Acnologia sunk the island with his roar, but mavis saved them by using fairy sphere. Lucy and her ravenette friend though, still talk through their sleep.

What will happen next?
They will meet some strangers...
Will love bloom?
WILL Lucy isolate the feelings inside of her? Or wil she express them?

Will the war end? Or wil it rage forever?

FIND OUT IN THE STORY!

NOTE: I don't own fairytail or anything...