Hold your orgasm

You make a big effort, and you endure. A drop of precum emerges from the tip of your cock.

The nurse, remains calm, maintaining her professional attitude. She fetches a paper napkin and gently cleans it. "You want to cum, I know, sorry about that, I will finish quickly" she writes your measures and explains. "We will need to collect your cum, you can do it yourself with a rubber vagina, or I can call one of the nurses to help your with the process" she pats your head and continues "Don't be shy, we are here to help you"

With a mix of fear and arousal, you think about your next move.
The mysterious voice in your head says, "When the nurse leaves the room, look behind the machines"

You can check that, it's like a vent, but first, you have to answer her...