"Exactly, why, if they successfully pull one over on me I think I'll weep for the first time since I buried my mother! Hah hah! You'll never feel a stronger swelling of pride."

He leaves it unspoken, but his child also won't need to be that crafty... he could easily see another just like Charlie, someone who was perhaps a bit stubborn (between Alastor and Lucifer, how could a child of theirs not be?) but soft-hearted. And if Alastor needed to be their sense of cruelty and wiles to keep them safe in a den of Dealmakers, then he would.

"Yes... just like Charlie, they'll be able to go out and about wherever they please, won't they? What boons they might collect from all of Hell!"