He does find Crowley desirable, even when he ought to be annoyed. He figures out what Crowley's pressing him for surprisingly quickly, and instead of being irritated at Crowley's persistence in being difficult, he finds it oddly arousing. He's being pushed out of his comfort zone and encouraged to do more, to be more, to chase what he wants -- it's disorienting and disarming but he likes it.

His reply needs a moment's consideration. How to phrase this? What words should he use? Or perhaps he ought to be difficult right back?

"You know where." He opts for being difficult. It's unexpectedly thrilling.