Enter Natsumi Dragneel

Natsumi Dragneel and Gray Fullbuster are two complete opposites, one being a fire dragon slayer the other being a ice make wizard. The two are at each other's throats on the daily basis there isn't a day without the two butting heads. But that changes when Mira decides to send the two on a three day mission sparks fly and confessions are told.

(This is a fairy tail genderbend story Gray X OC female Natsu and Gray )