Japhrimel? Sherlock looked confused towards John. Oh... he thought. That must be his true name. He knew that John was a human name, but he had never actually thought about asking. It didn't matter because everyone called him John.

Except his mother, apparently.

"Umm.. this is.. Sherlock Holmes. I'm calling for... John." He wasn't even sure if he could pronounce that Demon name right, so he used his human one.

"I'm calling because John isn't feeling well, and he was hoping that you might be able to tell him why. He's never gotten sick in the months that I've known him. Demons, even half ones, don't get sick. And we need to know what's wrong so we can fix it."