Gratsu~ Gray and Natsu fanfiction

This is my first fanfic so hopefully someone will like it. Natsu can hardly stand Gray. They've been enemies since they were children, but they still had each others backs if it came down to it. That's what being in a guild meant. But lately, Gray has been acting a little strange and Natsu isn't sure how he feels about it. Will include smut and language so read at your own risk!