What's Behind the Mask?

(Naruto x Kakahi)
{Edited}

The Leaf Village has been rebuilt and Naruto has become friends with his new partner Kurama (AKA Nine Tails). But something has been troubling this teenage hot-headed blondie for quite a while now, and he can't figure out what it is. So what does Naruto discover about his Sensei when Kurama gives him the great idea of trying to see behind Kakashi's mask.....?