He Saw It

I partially shifted. It was just my arm. I started feeling the burning pain. Then my bones started to crack and shift. It woke him up. My bones poped from the sockets and he turned on the light to see what was happening. Fur started to grow on my arm. My bones reshaped then pulled back into the sockets. My entire arm and part of my shoulder shifted into a wolfs forleg and paw. He is really freaked out. He didn't believe that werewolves exsited. How can I help him come to grips with who I am?