Hmmm, not bad. Gives me something to work with here.
You know I don't usually entertain arrangements like this but, on the phone, your wife was very insistent. And of course her offer was too good to refuse.
Down on your knees slave!
I want you to get yourself hard and then we're going to start by using that shoelace to tie up that filthy little cock of yours.
I want you to wrap it around your cock so that the laces cross just above your sack and then you are going to wrap it around your balls as many times as you can and still tie a knot.
When you're hard and tied we'll...