Incorporating Pre-Cum in Disciplinary and Medfet Play

A man being disciplined or examined may start producing pre-cum, and it might start leaking out of his penis even if he doesn't have an erection. I am wondering if any of you have incorporated this (or had this incorporated) in your medfet or disciplinary play? What are some good things you can do with pre-cum to add to the elements of humiliation that are part of the play we all enjoy so much?

I have a lot of precum during medical sessions. My play doctor enjoy using it as lubricant for insertion of urethral sounds and she also love to retract my penis and clean my glans with a cotton swab from precum to continue examination. This is an intense stimulation making me squirm.