Sebastian would counter that it is entirely fair. While he's no longer the 'guest' of those fae he bargained with, there's no doubt in his mind that he's still paying off the original bargain.

"They usually do and now, if you'll excuse me, I ought to continue homewards." As much as he's curious about the Huntress, he's not foolish enough to stay any longer than he needs to. While she may be aware of Nuala's protection, Sebastian isn't.