The name rings a bell immediately, but Cisco isn't sure why until a moment later when Sirius says magic and Muggle, and he can't help the way his eyes go wide when he realizes that this is Sirius Black who is Harry Potter's godfather, a man who can turn into a big black dog whenever he wants, who's ridden a Hippogriff and a broomstick and who has a wand with which he can make magic, real magic.

Cisco's wide-eyed and silent for long enough that Sirius starts to give him an uncomfortable look, and Cisco hurries to release Sirius's hand.

"I, uh, no," he finally answers Sirius's question. "No luck so far. I think it might be an alternate dimension, but so far I haven't been able to pick up on anything useful to prove the theory true or false." Cisco pauses, clearing his throat and taking a drink of his coffee, which as gone cold.

"So, where were you before you came here?" he asks, trying to sound nonchalant, curious from what part of the timeline Sirius was pulled here.