>summary: You're a nurse at a sperm donation clinic, charged with inspecting those who want to sell their sperm. The listener's passed the background check, and you're just examining him for any unusual traits. SMOL PP is an unusual trait that you're less than keen on dealing with. You have him dispose of his load into the toilet, and berate him for thinking this was a good idea.
>tone: clinical, at first. You're probably fed up with looking at the dicks of self-important men, though, so you get increasingly into berating the listener.

[forced cheeriness] "Good morning, Mister [possibly cough to render this nameproof or just say 'Anon']. We've checked over your paperwork, and just have the extraction left. If you wouldn't mind following me to one of the examination room, we can just verify that everything is in good working order. [pause] There's no need to be concerned. I do this all the time, and it's just a formality."

[door opening noise? Depends on the amount of time you want to spend on this] "I'll need to disrobe. I can turn around if you want, but I'm going to end up looking anyway. [pause] Alright, I'm looking at the wall. Do it quickly, I've got plenty of other men to see today. [pause] You've taken your shirt off. You're halfway there. Nothing out of the ordinary, you're trim enough. [pause] You'll need to take your trousers down. I'm not going to be shocked by what I see, I've seen more penises than I can count."

[stifled laugh, pause, attempting to reassert clinicality] "See? Nothing [awkwardly] impressive. Are you alright? I know when men are nervous they can shrivel up, and [slightly smug] I've been told I'm intimidatingly pretty. Would a closer look help? Why don't you just tear these scrubs enough to get a good look at me. [pause] Don't worry, they're meant to be around erect penises all day, they'd have to be disposable. [seductively but also blatantly lying] I wouldn't mind a man with your qualifications ripping the whole thing off me, either."

[cloth tears] "Well, that's something. Let me just measure it for our records [pause, some sort of camera click noise], and a photo. [pause, thinking] I'm sorry, but we can't accept your sperm. I don't see anywhere that could, truth be told. Your resume is good, but you're simply missing an essential qualification."

[annoyed] "Don't fucking protest. You're not in a winning position right now. Ripped top, cock photo, you're clearly aroused and angry. What do you think would happen if I screamed? [pause, firm] You are going to do /exactly/ as I say, until I lose interest. Do I make myself clear? [pause] Good. Why don't you get naked, and get down on your knees- [pause] let me get naked first. [pause] Take these panties, and rub them on your cock. Get your precum impregnated into the fabric- it's the only impregnation you'll be doing."

"I know I have a nice ass. Ram your tongue into my into it. [moan] Jerk off by all means, but DO NOT FUCKING CUM. I assure you- I know exactly where your cum is going to go. [improv some moaning as the listener tongues your ass, then proceed] It's so nice to see a man like you humbled. You thought you were hot shit, going to pass on your genes without any responsibility, and collect a nice little payment for it. I wouldn't have minded if you'd been a little bigger."

[pause] "Look me in the eye. Tell me with that tongue that was swirling around a strange woman's asshole seconds ago that you deserve to reproduce. You can't, can you? [pause] You showed up, with that vestigial /thing/ in your pants, and expected me to think it was okay. I'm disgusted, [pause] and you need to make it up to me. You're going to give me twice what you were going to collect for the sperm. You're going to tell the receptionist you got cold feet at the last second, and then you're going to show up at [pause] this address tonight with an apology card and a bottle of wine."

"Despite all of rudeness and inconsideration, I'm going to do my job [pause] more or less properly. I'm going to extract a load from your shriveled little parts, and then I'm going to send you on your fucking way. Come with me to the bathroom. [pause, interrupting] Don't try to stand. You're going to crawl naked, where you belong."

[some sort of scene transition, possibly you berating the listener for a bit punctuated by doors opening and closing]

"Kneel in front of the toilet. Look up at me while you jerk off into it, I want you to get a good look at what you will never, ever have. [improv some masturbation while the listener does his business] Are you done? Didn't take long. Watch my hand. [toilet flush sound effect?] Thank me. Thank me for protecting the world from your lineage. [pause] Now get out of here."