*waits for Snape to confirm whatever is he wants to be called* *slightly distracted by the possibility that this is yet another alternative reality, and the man in front of him is actually this "Clayborn" character, because he really doesn't look like the Snape Sirius remembers (but that could also be because he isn't frothing bile at him), but dismisses it almost at once, because the name matches the one on Snape's card*
Sirius Black. *he appreciates Snape returning the courtesy, but he isn't the only one with the first name "Sirius" and house name "Black" -- even if you manage to hold the realities separate and constant, the naming convention for first born males on the family tree is hardly... imaginative* *and he's fifteen years too young to be himself in this reality*
It's a pleasure to meet you. *doesn't bow, since he's seated on a stepladder and doesn't extend his hand because he's holding coffee, but his tone is polite, implying that he might do any or all of the above if he weren't currently inconvenienced* *smiles* Again.
Sirius is going to head back to MacAbre's once his back order is ready. Would Snape like to come with? They no doubt have lots of references pertinent to The Thing :)