Natsu and Lucy are back from a job. Frustrated with Lucy's complaining, Natsu wishes to challenge Gray. But why are Gray and Sting fighting and what does it have to do with him? Is Natsu really as oblivious as they think? How far will Sting and Gray go to find out what the fire mage is hiding? Gray x Sting & Natsu x Rogue. One-shot upgraded to crack-ish plot thanks to feedback!