Finding My Long Lost Twin Brother
(After the one year break up of Fairy Tail and Lucy is 15 during the story)
Lucy comes home after finally getting Fairy Tail back together and finds a letter at her front door, curious she reads the letter and finds out she the letter was from her mom.
It was sent when she was five and was suppose to come back to her when she was older. She finds out she has a twin brother named Tamaki and she is to find him and stay with him.
She leaves Fairy Tail with pleasent good byes and set off to find her brother and tell him about herself and stay with him.