The first thing to happen is that you grow taller. You actually are a bit shorter than you would have liked, so this is a great start. But, then things begin to diverge from your ideal.
For example, the very next thing to change is your outfit, going from a simple tunic and pants with a well worn pair of shoes to a rather expensive looking gown with long sleeves that ended in extremely wide cuffs that when holding your arm out straight, would drape down almost 90 degrees to a point. Aside from the odd sleeves, the rest of the gown is fairly form fitting, which doesn't fit to your current form at all. At least the chest area is quite roomy, so at least you can breathe easily.
But then your legs cramp severely as your knees bend, then break off into a new set of inverted joints that rise a little higher up behind your thighs before hitting the inverted joints and angling back down to the ground. A form of alien looking, digitigraded legs essentially. Your toenails expand and blend together, then wrap around all of your toes as they all merge into a single toe per foot. Your new toe nails then extend to line the bottom and sides of your feet before reaching your heels and ankles, coating them entirely. Strangely enough, the hard nail is actually somewhat flexible now too. But then out from below either heel, a flat tipped spike forms, pushing out by several inches and forcing both feet up onto their respective toe. Out from the tip of your toes, a hooked talon-like protrusion grows out.
You are now standing on what essentially are high heels, only made out of your own body, and with a talon for their front. They also are flexible enoough to bend back and touch the point of the talon to the base of the heel spike. And to finish them off, the nails turns black.
With feet looking like a mix between a single toe'd birds foot and a high heel ankle boot, you don't know what to expect next. You do notice it though, as your muscles melt away, thinning out your arms and legs, shrinking your chest and abs while your waist also shrinks inwards significantly. And what you loose in your waistline, you seemingly gain in your hips, as your pelvis widens out and your thighs thicken a bit to compensate a little for the wider gap.
If looking from a distance and without seeing your head, you know that you must look like a flat chested woman with this new figure. At least the gown fits your body a whole lot better now. And your weirdly bent legs and oddly shaped feet are still covered fully by the gown too. Then your ass grows out, becoming a soft, perfect cushion. But now your gown looks like you have a literal shelf for an ass behind your back. It certainly doesn't feel that big, but the gown makes it look that big.
Your hands slim down and become feminine although now they barely are able to poke out of the ends of your sleeves. A pair of breasts push into existence on your chest, then expand to fill out the gown, and then some, as you feel the material begin pressing into them as they expand. Not to a point that looks rediculously oversized for the gown, but enough to make a small indent along their edge, and to push up your boobs into creating a much larger amount of cleavage that now runs down the front a bit too.
You give your new boobs a testing poke and watch your finger sink into them a bit. They definitely are real, as you can feel your finger pressing into them from both sides. This isn't the first time someone's gender got swapped by the transformation, nor would it likely be the last. You just didn't expect for it to happen to you. But since it did, you're just gonna have to learn to deal with and accept it from now on.
As if on queue, the transformation reaches your head. Your face reshapes to be a bit more adult looking, then becomes completely feminine. Your brown hair turns raven black and lengthens to way down past your new double knees. Interestingly however, it is styled already and includes several black feathers where other hair holders normally would be used. A pair of strands from your bangs drop down the front sides of you face. And while only bairly reach your chest, they are both capped by a similar black feather as well. You do appreciate that the feathers aren't all floofy like some of those funny looking hats you have seen. Their sleek, sharp look, looks much nicer in your opinion. And even the longer ones are the same.
To end it all, your dick retreats back inside you, followed by your balls. Leaving behind a new moist pussy in their place. You sigh as you feel lighter all of a sudden, but you just ignore that for now as the light begins to fade from around you.
Many gasps can be heard from the small crowd of people as your new form becomes revealed to them. Even your parents are not immune to the shock of seeing you in your new form as evidenced by your Mom covering her mouth and your Dad's blank, expressionless staring with his mouth open.
You lift the front of your gown a little and cautiously try to take a step forwards with your new legs. You gladly find it to be just as easy to walk and pick up your speed as you gracefully descend the stairs and make your way over to your parents. You realize that the sound of your heels clacking against the hard floorboards with every step you take will be something you must become use to always hearing from now on. While it isn't too big of deal to get use to hearing, it will always be a constant reminder of your new form, among several other things.
The biggest thing you now have to get use to are your new large assets on your chest. At least they are not as heavy as they should likely be for their size. But they do bounce and jiggle quite a bit in this gown. But that isn't necessarily a bad thing either, as they are very nice to both look at and feel. And honestly, you don't even mind if people see them for some odd reason. Though you won't just go around completely top less. Not yet at least. Though maybe someday soon. The more you think about it, the more you want to try it, so you immediately stop that line of thinking before you start doing something you would later regret.
When you reach your parents, you are kind of surprised to find that you now stand quite a bit taller than your mom. And although that is essentially with you having high heels on, without them, you bet that you are at least a few inches above her still. Your mom is actually somewhat tall for a woman, standing at just about 5 foot 8. And while both of your sisters are in the same boat as well, they both are now 5 foot 10 inches post transformation. You on the other hand, up until now at least, only stood at around 5 foot 5. So the added 5 or so inches from the transformation seem to have brought you up to par with the other women in your family. Though in terms of chest size, you for some reason, are way ahead of them all, and not by a slim margin either.
Your Mom immediately hugs you when you get to them. "Well, I guess you will be needing some new clothes, we can go out shopping tomorrow if you'd like?" You nod in agreement.
"Well, it looks like I'm back to living in a single male household again" says your Dad. You smile sympatheticly at him. "I'm still me, so it isn't like I now only have an interest in girly things. While I do have some new curiosities admittedly, I still like everything I liked before this."
"Well, at least you are still human" sighs your Mom while she lets go of you.
"Umm, about that... I need to show you something, but only on e we are back home." You say awkwardly. Your parents, now looking at you with concern, don't waste any time in bringing your right home. And upon entering your home, they finally hear the sound your feet are making against the floor.
"Wait, that sound was comming from you?" Asks your Mom. You nod and untie the back of your gown, letting it loosen up before you try and take it off with your Mom's help. Upon removal of your gown, all three of you become surprised. Your parents for obvious reasons, but you too because some things had changed without you realizing they did. For one, you now have a human sized, black feathered bird tail. But also your calves have turned black like your feet and are much thinner than the rest of your legs. And your heel spikes are slightly curved inwards, now appearing similar to your front talon, only reversed. Your lower legs are very bird-like now.
But that's not all. Along your forearms, long, black feathers now point backwards, even past your elbows. And from the looks of it, can be spread out to transform your arms into wings when needed.
"Oh... uh. Well, at least they can all be kept hidden by a long sleaved gown like this. I guess we will need to get quite a few dresses and longer skirts for you too. But we will save money on your shoes at least." Says your Mom. She seems to be trying to cheer you up for some reason. You actually are fine with all of this. Sure you are not exactly how you wanted to be, but at least your not a frying pan or a rock. Being a bird woman may be fun in its own way too. You likely can fly too!
"Woah, take look at you!" Comes a voice from the stairs. It is your older sister Sonya, who has sleepily come down to take a look at the new you. "You lucked out, Sis. Those are bigger than any of ours, and your actually really hot too. Plus you got this whole, bird thing going for ya. You definitely finitely came out better in my book."
"Thanks, Sonya."
"And you even have a sweet sounding voice too. What else did you get? Can you do magic now like Karina can?"
"Um, I don't know. I don't know how to test that. But I think I can fly now as I am pretty light weight, I think." You reply excitedly.
Sonya walks over and tries to pick you up, only to accidentily launch you almost into the ceiling. "What the fuck? Your practically weightless! Don't go outside on windy days I guess or you may blow away."
You slowly fall back down onto your feet and non, keeping her warning in mind. "So I guess your name is Raven now, right?"
You, and also your parents, turn to look at Sonya. "What? It's a fitting new name for him, her. She has bird parts, and black raven feathers in her now black hair too" explains Sonya.
"Raven... Alright, I like it. And it is rather fitting, though maybe a little too fitting." Your Mom looks at you and asks if you are sure. And says that you don't need to rename yourself if you don't want to. But you turn her down and reiterate that you want to try going by Raven for now. And even if you end up disliking it, you can always change it later.
Sonya then helps bring down some of her looser fitting clothes. The panties fit well enough as they are the kind you can tie. And her skirt is easy too. Only her tshirt is a struggle, as it is quite tight in the chest area for you. You are about ready to cut out a pair of boob holes in the tshirt when a knock comes from the front door.