One thing Steven will eventually find out about Skulduggery is that he deeply understands the idea of a complicated magical relationship. He could probably tell Skulduggery exactly what was going on and only get a surprised huh in response. As it is, the twin angle being an obvious cover doesn't phase him. It interests him, obviously, because he's as nosy as a man without cartilage can be, but that's about it.

"It sounds like there was a lot to go through." He nods sympathetically and then addresses the anxious elephant in the room. "You seem a bit nervous. Are you feeling alright?"

He really hopes Steven isn't actually the secret murderer he's half-expecting there to be. That would really be a disappointing first meeting!