The Tale of Alar - The Alar Saga, #1

All his life Alar has dreamed of a better place for himself and his boyfriend, far away from the dirty old slum of their youth. When the king's daughter is kidnapped by an evil wizard, he at last gets his chance to realize that dream by joining in the quest to save her and claim the vast reward offered. But the outside world is a bigger, more complicated place than the young squirrel could have ever imagined.
And in between making new friends and battling ferocious monsters, he discovers that the world of the heart is more complicated still.