It depends on the deal. Not usually.

[ But he strokes over Alucard's cheek with his thumb a few more times. Thoughtfully. ]

But you mean Leon's vow to your ancestors, don't you? [ There are no other deals that apply to anyone they know. Not that he knows of. ] That one's- I don't know the details. But I don't think there was ever an exchange. There's nothing to be returned. It should be reversible.

[ And then, almost hopefully. ] Do you want to meet them? Mother and Leon and my sisters?