Queen of the Demons: Fire and Ice.

Lucy Heartfillia has a secret. She's an Etherious. One of Zeref's strongest demons. Not to mention, she's also the queen of demons.

So when she went missing during the fight with Tartaros, everyone spread out to search for their missing celestial spirit mage.

Little did they know, she was in Cube, changing into her white and blue gown. So when the fighters reached the throne room, she was there.

"Lucy? Why is your hair white? Are you like Mira? Why are you wearing a gown?" Gray asks, confused. "I am the demon's Queen. An Etherious. My element is ice. My husband should be here now." She answers, just as the doors fly open, revealing a man with horns sticking from his head, wings poking out his back and slitted eyes stalking up.

"My queen." He says, pulling her close. "This is E.N.D, my husband the demon's king. Also, the one you should be killing, Gray." She says.

"My name was never Lucy Heartfillia. My real father, Acnologia, gave me to Layla and Jude, in the hopes that I would never find out who I really am. That hope was in vain. I've known for years. My name is Lucy Iceflame, daughter of the chaos dragon." She says.

The others are stunned. "You played us for fools all these years! You pretended not to know what demons were, but you actually knew all along! How could you, Lucy!? We trusted you! But now, you've broken that trust!" Erza screams.

"Fine. Have it your way. I don't care. My place and home is here, with demons like me." She sneers.

"Lucy, please reconsider. Your home is with Fairy Tail, not with these disgustingly horrible demons." Master said. Unfortunately, he made a mistake in saying that.

She shrieked, her eyes turning demonic, her wings unfurling, as icy lightning crackled. She lunged at him, swung her arm up and punched him in the face.

The onlookers watched as she attacked Master without a beat. Their Lucy really was a she-demon. "Lucy, my queen, stop." A voice sounds.

They whip their heads round to see E.N.D start working on calming his enraged queen and wife down. "Why!? Why should I!? He provoked me!" She screams.

"Lucy. You're better than this. Calm down." He orders, kneeling down, taking her hands in his. Still breathing heavily, she snorts, shaking her head, eyes narrowing.

E.N.D starts whistling, before he starts to sing. Lucy stiffens, tensing up as she recognises the song. "For the Fire and the Ice? Really, my love?" She asks.

He shrugs, "It was our wedding song, babe. Why not?" He says.