If I had my time over again, I'd ask the (uninitiated) girl to lie down & hold onto the bed rails or whatever so she's stretched out- kind of 'just lie still while I tease you & get you all hot...'

A simple progression to 'stop wriggling or I'll have to tie your wrists.'

I just showed my potential wife a couple of bondage magazines & said it was an interest of mine, but she didn't have to participate. Her own interest sparked the beginning of a few rope games & waving of crops & collars around over the years.

If you become a half-way decent Dom, you'll be beating the girls off with a stick.