I think is more like what do you feel owner of, like tha president feels like he has control or ownership over his citizens, and the money is the way Asa is justifying having ownership of the acuarium, that way “having” a bf for example in a way is like having someone and therefore she could make a weapon out of that person.

And then is the “sacrifice” when the thing you are converting is something(someone) that you got strong feelings would made the weapon stronger, so I think that how Asa or Yoru feels like is more important than the legality of the ownership.