"Yes, that's it exactly," Remus nodded as Sirius made the comparison to his uncle's own change in age. How strange that these things were now just discussed as something entirely commonplace.
"I know, your uncle has been telling me all about it, and asked me to come over because I think I can help," he explained. "Now, I'm going to uncover your arm and take a little look at it, if that's okay?" he asked him. There wasn't exactly very much choice in the matter, but Sirius would feel more at ease if he felt like the adults were listening to him and not just forcing treatments upon him.