I don't know how far along you are but i had this done to me and loved/ hated it

tie her to a bed in her underwear spread eagle, tickle her all over for a bit then don't take them off put oull her panties down a few cm then play orgasm control/denial then the rest is up to you, wheather it be sex, pegs, or whatever, be kind and cruel. Let me know if you do any of these and how it goes. It was fun for me so have fun!!

And ice all over the body in the undies with them keeping it in place,and tickle her with it.
The mistress of TBC...