"Hahh, well if you are really sure about this, follow me please" says the man. You follow him out of the room, and across the main area. He then shows you into another room, this time one where there are a few pieces of medical equipment. The room itself even looks to have been temporarily converted into an on-site medical room. The man has you sit down on a gurney that is being used as a makeshift examination table.
"Alright. Now I just need to scan you to see if you are even compatible. This will take just take a few seconds, but try not to move as much as possible while you are being scanned" explains the man. You follow his instructions as he runs a handheld device over you, starting at your feet and working his way up past your head. It actually takes him about 3 seconds to do it too. When he finishes the scan, a "ding" sounds and the device shines a green light. This leads to one more sigh from the man. "Well, you're compatible," grumbles the man. He then looks up at you and explains what will happen next. "Now is your last chance to back away. Once you sign the forms and I administer the first injection, there is no turning back, understand? If you truly are dead set on doing this, then please fill out these forms and sign your name at the bottom. Once you do that, I will administer the first of several injections which will prime your body for the other's. Then I will prep you to move locations to our main medical center for the rest of your injections while the first one does its work. This whole thing should not take more than a few hours to finish. If you have anything left to do beforehand, let me know now and we can schedule a time for you on a later date."
As if you have something better to do. You're a poor, soon to be college student, what could you even possible afford to do? This is why you are here in this first place after all. So you shake your head and take the form and pen from the man and begin filling it out. It's mostly just legal stuff like waivers and the like. You sign your name and hand back the paperwork to the man who then injects your left shoulder with something blueish in color.
"Lay back down on the gurney please. The substance will definitely make you feel lethargic, so be aware of that. When you get to the center, we will begin with the sex change, then the rest afterwards. You will be receiving ears, tail, eyes, sensory inputs, scent glands, various muscle, joints, and bones changes in order to make you able to survive living with a black panther as a mate. Additionally, your hands and feet should grow in pads and claws, and your digestive system, and of course, the reproductive system will mostly be changed to those of a female black panther, though as per request from the employer, you will keep your human sexual features as well. In other words, while you will have numerous teats, all of them will be paired with their own breasts."
You listen to the explination as the man straps you in, and are starting to feel the injection kick in as your body starts to feel very heavy. Your mentally sound and can still keep up with the conversation, but you in no way are able to move your body anymore. It's as if you have lost all your strength strength. It is disturbing, feeling this uncannily weak. But this is what you literally signed up for, so you just need to deal with it for now.
"Now, your new body will be able to switch between a bipedal human form and quadrupedal, cat-like form, at your will. Nothing physical will change about you. The only difference will be in which muscle groups you will be using. I guess who you want to mate with at the time could also determine which form you will wish to take too."
You just keep listening to the information as you are loaded into a vehicle and brought over to their main building. Once inside, you notice that your strength is comming back and are able to sit up again. Almost immediately, your clothes are stripped from you and a pair of injections are a quickly administered right after, both of which are injected right into your lower back. 2 more are injected into your chest, and a final one is injected just above your crotch.
They work really fast too. As you can feel your body mass begin to crawl as it is relocated and repurposed for the opposite sex. Excess fat and muscle begins being repurposed and starts filling out your ass and chest, pushing it out a nice and large pair of breasts. Your body slims down, and turns a lot more dainty and feminine. Your face and head reform into an indisputably beautiful, feminine face while also shifting your voice into a much more feminine sounding one.
You give your new voice a quick test and find it to sound quite sexy most of the time. Your hair turns black and grows out long and mostly straight with just a small bit of a wavyness to it near the ends. The last to change is your dick. You sadly watch it shrivel up and invert back inside of you, taking your balls with it. It feels weird looking down at a pair of boobs and a dickless crotch. Your new hole finishes developing into a fully functional pussy right as the next round of injections are finished being prepared for you.
"Alrighty then. Which injection should we start you with first, Miss?" Asks one of the female workers. She appears to be the one currently in charge here as well. "If I may recommend something, I would start with the outer stuff first, like the ears or tail. Not things like the digestive system or your senses. Those are quite boring to watch."
"Um... let me start with..."