Incredible. In his world, stand users would do anything to protect the nature of their abilities, yet here she is telling him everything.

"A useful ability to have, considering the circumstances." And he's decided this may have to be something he profits off of, at least until he takes over the world. "Perhaps it wouldn't hurt to make this arrangement more...long term. Permanent."

It was easier when underlings or useful people just wanted piles of gold he had lying around in his mansion. Now he actually has to get off his lazy ass and do things for his side of these kinds of deals, ugh.

"In exchange for your blood, I'm certain I could be of...some use, on occasion."