"I know you are who I think you are, you're very recognisable," Sirius muttered, figuring that he probably couldn't ask Remus to simply show his patronus. "What happened with the chocolates I used to get from the girls for Valentine's at school?"

There, that was personal enough. Insider knowledge and the kind of memory that felt bittersweet. But then, there was no memory left these days that didn't have bitterness attached to him.

His eyes followed Remus's actions as he took his pulse, lips quirking up into a smile. Such a practical and caring thing to do. Such a Remus thing to do, in other words. He really had missed him. "I don't know. Everything hurts. I know you know the feeling."

He had witnessed his transformations a few times, after all. "I'm not going to break, Moony. They aren't-- It won't happen. So it's fine. It will be over one day."