Mhh... Just two vampires drinking one another's blood indefinitely wouldn't have worked much in my head, either - after the first exchange, they'd already have stacked their two individual parts of the curse, and everything after that would just have done nothing. I imagined it less as an uniform power, and more like different vampires carrying different "parts" of the same curse, as it were. Parts which, potentially, could be gathered up again.

	@Rhae: He is not going to give up and leave immediately, no... What he actually does might depend, though.