(I am suddenly flashing, most disconcertingly, on a Bujold novel. Nevermind.)

I wouldn't like to be the one to convince a Dementor to give up a piece of soul that it's got, but--or, wait, could a Dementor go to Kiss Harry & get interrupted and only get the piece of V's soul?

. . . probably not. The world is a better place for my realizing that I can't plot.