Knickers/panties as gags

Always best to use clean pairs if you are just playing for the first time or definitely not wanting to get infections in your mouth.

My female play doctor stuffed her panties in my mouth when I was asking too many questions during my examination.

Your female doctor sounds like a real bitch.

😉

Sure, if you have clean pairs around, that could work. And most would not want to have any nasty germs from "back there." But if you're worried about infections from the front, you'd never do any oral stuff, either.

More effective of course if she pees in the first and then they are stuffed in her mouth... adds to the humiliation.