It's still gross. And disconcerting. And a whole host of other things that Sirius doesn't even want to consider. Ideally, he'll only have to do this once, get a read on the scent and then let his nose do the rest of the work. And so, shoving aside the rational part of his brain that is screaming "it's a severed head", he leans forward and takes a few sniffs of the box, and the head.

"God that's disgusting" he says, pulling away and rubbing his nose. "But I definitely smelled magic."