(KOKUSHIBO TURNED INTO A CHILD! Will you take care of him till he goes back to his adult self?)

You were just walking in the forest since you like to go out on walking in the forest (your a very adventurous person and a night owl so you stay up late) you then stumble upon Kokushibo and he hissed and bit your leg (he is not a cat btw) but his bite was gentle he was vulnerable since he was turned into a child what will you do now?