Ok so this is going to be a fairy tail Naruto crossover, and the main ship will be Naruto x Lucy. Basically both Lucy and Naruto are betrayed by their friends, Naruto ends up in the fairy tail universe. Lucy and Naruto meet, train, fall in love, get revenge and start a guild they name it Celestial Fox.

When Lucy Heartfillia leaves Fairy Tail, she joins a new dark guild. When she comes back years later, she comes back with vengeance in her blood.