Sirius is a little surprised both by Q's request, and by Severus' response, since he knows he's discussed this with Severus, and that was only because Severus had discussed it with Q.
He puts it down to James' ability to rattle people, even post mortem, and decides to go non-verbal -- both to Severus and Remus.
You know what he needs it for. Be nice.
And then fervently hopes that Q has done his homework on how much he needs, and what else the preparation requires, because Sirius hasn't had an opportunity to# since the last time he discussed this with either of them.
#Hope this is okay? Let me know if not, but I know Sirius and Severus had definitely discussed it while Sirius was a puppy, and he's only not been a puppy for a couple of hours at this point, so he's not going to be able to give Q any more information than the last time :)