The creatures that drink blood, correct? [Mention of such beings have been made more than once during Homura's tenure. So this new version of Ayumu has intimate dealings with at least one such creature.] And Derek is one of these things.

[Homura grins as Ayumu finally gets it.] As far as I recall, you are a ninja, though publicly your role is that of a housekeeper. And vampires are not things that exist in your world, unless you have failed to mention them before.