You were a bit surprized when all of your chest hair suddenly fell off, as well as the rest of your body hair. From the neck down, you were completely hairless now.
"I'll excuse myself outside, ma'am. To give you some privacy" said the Doctor. And before you could even say a word, he had already left the room.
You look back down and examin your new pouch, even taking a look inside of it. Although you were not sure what you were expecting it to be. It essentially was just an extra flap of skin. There wasn't really anything too special about it in the end besides the 4 nipples, but the novelty of finally having one had you grinning ear to ear.
Then a pressure hit you down below for a brief moment as your "second pouch" finally finished forming as well. This had always been one of your biggest curiosities, how does it feel to have a pussy? And now you finally knew, albeit with a roo's pussy, not a human one. However it was a pussy nonetheless, and sticking a finger inside it felt just as good as you imagined it would.
As you fingered yourself, you enjoyed the feeling of your tail growing in, which in fact had pulled you backwards a bit due to its weight. It was like a personal chair for you, as you found that you could lean your weight fully into it, and if it was up against the wall, it would support almost your full weight. What's more, if you leaned back a bit, you could balance on it with just using your one leg as a support for stability. And now that you could stick your leg up, your pussy widened, allowing for a few more fingers to slip into it a bit deeper, bringing you even greater pleasure.
After some stretching, you were now wrist deep inside your pussy. You then felt your leg getting a bit numb from blood loss, and lowered it back down, accidentally trapping your hand inside of you. You tried to pull it out, and managed to do so rather easily, albeit not as comfortable as going in was.
You go to tale a step forward and instead of using your right foot, both legs moved at the same time, causing you to jump forward. You manage to steady yourself before you fell onto your face though. Again, you try to take a step, and instead hop. Curiously, you try moving just one leg, which you manage to do while going very slowly. But the moment you go to take a step, you hop. You can no longer walk, unless it is at a literal snails pace using the smallest steps possible.
While you are enjoying your gradual transition by hopping all around the room, your chest begins to itch and press forward, becomming a pair of fairly large D-cup breasts. It is now that you finally look over towards the mirror, and see a woman with a pouch, tail, and ears of a kangaroo.
"Woah, is that me?" You ask, only just now noticing your unmistakably female voice for the first time. "Damn, and who could have guessed that I would make for a pretty hot woman. Ah well, I'll just be another kangaroo soon enough though. It's quite a shame in a way. Wasting all of this beauty." While you admire your reflection, your arms slowly migrate into a new resting position, bending along your sides a bit while each wrist goes slack, giving you that normal kangaroo hand look. Your arms and hands were still very much human though.
You are eagerly waiting for the next change, when after 20 minutes, nothing happens besides your head hair growing longer and longer until your now straight, light beige hair, had reached your lower back in length. However that was 15 minutes ago. Your now are just looking at the mirror as a half kangaroo, half woman hybrid, patiently waiting for the next change to begin. This continued for a littoe while longer until a loud knocking came from the door, which even before you could answer, had been opened allowing a team of over 8 doctors to flow in and surround you.
Confused, you just stand there watching them look you up and down, some were even jotting down notes here and there, or even taking a picture or two. Finally the doctor who gave you the injection enters the room. "Ah, shoo, shoo, let the lady breatbe for christ sake." The head doctor approached you, as the rest pulled back over to the side of the room. "Damn Steve, I do not have any easy way of saying this, so I will just be upfront with you about this. I am very sorry, but this is as far as your transformation will let you go it seems. Your body has already isolated the injected substance and is almost fully immune to their effects. This rarely happens, so rare in fact, that we have only a few handfuls of examples in all the years we as a species have delved into restructuring humans into other things. What this means though, is that you are stuck in this form until further notice. Of course, all of your future living expenses will be paid in full as our compensation for this great misfortune."
"What, I am stuck like this? For how long? I can't be just left as a hybrid, I wanted the full package."
"I am truely sorry. It is out of my hands though. Our best experts have tried for years to find a cure for it, but it always ends practically with no progress at all. So that means you will be like this for however long it takes for you to either die, or a cure is invented."
The doctor truely looked sympathetic towards you, so he at least seemed to be telling you the truth. You didn't know what to even say to that. You were stuck. A freak now.