Bravo Sir, bravo!
Make sure you get her to confess how much she loves it ,when she’s right at the edge, get her to describe how it feels, what it’s like to be told what to do by you, how much it makes her look forward to seeing you even more. Get her to beg, not to cum, but to be denied, even get her to cry out again and again, ‘Never let me cum!’ as you take her over the edge.
She’ll adore it.
Merry Christmas to you both!