"Well... I guess you can borrow my 'testosterone factories'." You said.
Mia nearly jumped with joy. She retained some reserved grace, however and merely nodded.
"Yes! That will be fantastic." She said, "Let's go to the transfer machine room, I want to make sure this is done right."
"Uh, sure." You say.
-----
Mia dragged you down the main thoroughfare towards the machine rooms. You gawked and gawped at all the strange configurations of bodies and parts... and at some of the absolute babes walking around. This place was going to be fantastic!
Mia takes you to an austere desk manned by a youngish mousey woman.
"Welcome to the MONITERED TRANSFER WING, how may I help you?" The clerk asked, hardly looking up from her screen.
"Hello, this young man would like to donate me his testicles." Mia said, beaming.
The clerk checked quickly between you two.
"Whole genitals or just testicles?" She said, flipping through some files.
"Testicles." You answer.
"Donating or swapping?" She asked next.
"Well, I don't have any yet. So donating." Mia answered, chuckling gently.
"Ah, one can never tell here. But, I also wanted to check if you still wanted your ovaries." The clerk said.
Mia looked down at the floor in thought.
"Well, Mia, if you wanted to grow muscle its probably best to give up your ovaries, right?" You ask, "I skipped a lot of biology classes, so I'm not really sure if that's how it works."
Mia nodded.
"Yes, I think you're right. I'll switch my ovaries to you while I get your testicles." Mia answered, checking to make sure the clerk was listening.
The clerk nodded, curtly and flipped out a couple forms getting you and Mia to initial and sign and read the consent.
Soon you were shuffled off to a transfer room. It was a spartan white clean room with a fetching red headed technician in a white lab coat manning the machine.
The machine itself was an ominous black box with a few inlays, that was otherwise completely smooth. It had a computer flipped off to its side where the tech was standing.
"Hello, my name is Molly and I'll be your transfer tech. I'm just finishing up the calibration and warm-up process, then I'll leave you to some privacy." The tech said, "Ah, testicles swap... interesting, I've only had one of those so far. Okay, so I'll get you to disrobe and stick your full genitlia near the machine. It should feel pleasant, if theres any discomfort let us know! Definitely do NOT RIP yourself out of the machine before it has completed the transfer cycle. Any questions?"
"Uh, no that's good. Will Mia be able to see me?" You ask.
"Okay, I'll configure you for room view sharing. Let me see if she wants to too... and yup, she does. Alright you're all configured! We are monitoring the room if you need anything else!" Molly said before leaving the room.
The you were left in front of the machine... you remove your clothes cautiously, trying to position yourself between whatever camera the room had and the machine to preserve some dignity. You could see Mia in the view port... her breasts were surprisingly full and perky for a woman of her age. Her skin looked bronze, tan, and smooth... she had a cute butterfly tattoo on the front of her hips. Wow.
You place your dick and balls in the machine and it feels nice and warm. You can feel your balls being stretched - it's pleasant but still alien. You can't see it, but your sure your testicles and sack have completely left your body now. You feel a strange pushing sensation in your lower gut as ovaries are placed within it... it was warm and pleasant. You watch Mia withdraw from the machine.
She looked very strange with both a vagina and a pair of testicles hanging from it. They kind of fell below the lips... you weren't sure how sex was going to work for her now... she may crush her balls if anyone were to pound her... and would she now cum semen? Strange.
You look at your own member. Completely ballless, just a slightly stiffening rod of meat. You supposed Mia kind of turned you on.
Mia waved and sent a thumbs up before putting her clothes on and leaving. You shrug and do so as well.