Sword and Shield

When a 12 year old Shirou finds himself in another world with no explanation how he got there, he knew he was in trouble. The fact that he woke up in a cage, a Slave Crest on his chest and odd new additions to his body underscored this fact. Naofumi, the disgraced Shield Hero, did not care about any of that. He just needed these two raccoon demi-humans to be able to fight. AU.