So he had hearing issues before that? That explained a lot. Cisco smiled as reassuringly as he could and crouched down a little so he could look Hartley in the eyes. "Erm, I don't know how to assure you but it's going to be okay. I'm going to make this better. Oh! Hang on!"

Cisco jumped back and went to his bag, raiding it until he found his pen and then tried to find paper. Which was harder than it should have been. In the end he gave up and started writing on his own arm, his jacket now discarded as he presented himself as a human doodle pad to Hartley.

I'm going to fix you, I have tools and tech, I'll make implants :) I'm sorry you can't hear me. I won't leave you until you're better.