A Favor

(AU) Natsu Dragneel deals in favors, he does you one, and calls it back in later. You have no say in what it is or what he has you do, you just do it, no questions asked. Wendy is Natsu's little sister and a member of the gang Fairy Tail. How will the Fairies react when they find out the owe a favor to Wendy's Oniichan? (NaLu) (NatsuxLucy) (RoWen) (RomeoxWendy)