[...what kind of thing does she want from Ruka? To be honest, a lot is probably what she'd get if she were honest enough to ask, but this is Yuki we're talking about here.

The first thing that comes to mind is,]

Let's see. For these sorts of things, people usually do something like this, right....?

[...]

When I snap my fingers, you'll want to talk dirty to me. But every time you say my name, you'll get more aroused and want to do more. And if I snap my fingers a second time after that, you'll return back to this state to receive more orders.

[That works to start, right? She'll snap her fingers to let it set in.]