The doctor insists you stay for more tests

You reached out to grab your underwear and get ready to leave, but got interrupted.

"No! Don't put those back on yet!" the doctor yelled at you in a shrill voice. You couldn't help but notice she was staring at your cock again.

"Um, why is something wrong?" you replied hesitantly, dropping your underwear again.

"No it's perfect!" she said, before realising what she had said and blushing as she looked you in the eyes, "... Perfectly healthy! I think at least, but maybe we should do some more tests just to make sure, is that ok?"

"Oh ok, if you think that's necessary," you replied naively. "What did you have in mind?"

"I want to see your cum!" said the doctor excitedly, before realising what she'd said, "Ugh ahem, I mean I think we should make sure that you are producing normal semen samples, just to be on the safe side."

Dr. Turner found an empty sample jar in one of her cupboards, and handed it to you.

"Ok, is there a special room for me to do this, or...?"

"Oh there's no need for that, you can do it in here!" she responded cheekily.

"Like behind the curtain?"

"Sure, or you can just do it right here, you know, if you prefer," said the doctor, trying to play it cool, despite frequently glancing at your rock hard dick.

"Wow, ok, if you're sure," you responded as you wrapped your hand around your erection. Before beginning to stroke, you had an idea, and wondered how far you could push your luck. "It's going to be weird doing this without any material to jack off to, doctor, I don't suppose you have anything that could help with that, do you?"

"I'm afraid I don't have any material to help," the doctor replied, "But if you close your eyes for a moment, I can definitely help you to finish quickly."

You obediently closed your eyes, hoping that your doctor was about to strip naked for you, or at least show you her boobs.