Cock ring in a play exam

Hi, have you ever use a cock ring in a play examination ?

I think that is very interesting to use, i'm talking about of elastic ring that is placed around penis and testicle.

I have never had a patient do this, nor have I done it myself, but it would be interesting to try sometime for the pure fun of it.

I included a cock ring in the most recent story that I wrote and posted here. It was used in the last part of the story where the main character was being put through a series of sexual development and performance tests 😃

I would like to use it on a patient standing with a boner while I give him 2 injections... Just to test his excitement and see6if he can keep he's cock hard during painful injections!