Nothing is ever normal at Fairy Tail for long. Natsu and Gajeel had started to withdraw themselves from the guild by day, after they go on a job. Levy and Lucy do nothing but worry, and Mira can't fail to notice. So she cooks up a master plan -a festival- to find out What Are The Dragon's secrets?! All due credit to the creator of Fairy Tail. I don't own Fairy Tail, Hiro Mashima does.

...

BOOK TWO. After six long years, Gajeel and Levy are finally reunited--along with their son, Silas. And, as expected from Fairy Tail, trouble is awaiting them upon their return. A new demon has appeared, seeking revenge for crimes committed against him years before. When Demon Hunters become the hunted, and tragedy strikes Fairy Tail, Gajeel and Levy's love will be tested beyond anything they've ever faced before. (This is the sequel to "Bound By Hate"!)