Something to note, Marble Jenny and Marnie and Paige Joy show that Jenny and Joy are last names. This means this Jenny has a first name too. I used a random name generator, and got Andrea, so I'll go with that name for her.
-Andrea's PoV-
I've been having a frustrating week. A string of thefts have been going on, with the perpetrators always getting away. I became cheif of Viridian City's police force last month, so this doesn't look good on me. There's mounting pressure to take care of this. I see a boy I don't recognize, but feel like I should, and his Pikachu. I decide to investigate. I put on my siren as I drive up to him.
"Who are you? What are you doing here?" I question, a little too harshly I'll admit, due to my stress, and I internally wince. That's not going to make him want to cooperate. He gives a frown, but does't say anything that shows his his annoyance.
"I'm Ash Ketchum from Pallet Town!" He answers, showing a Pokédex, which I inspect.
"Hmm, all is in order. I'm sorry but recently we've had reports of Pokémon thieves." I explain to try to soothe his feelings. He looks annoyed for a moment, before responding.
"I understand, but I can't help, I just arrived here after getting back from Alola recently, and I'm on my way home." He explains. I notice him carrying a tank painted the colors of a Drifblim.
"What's that?" I ask, pointing at the tank.
"Oh, I found this on the outskirts of Viridian Forest, I thought that someone might have lost it." He replies, handing it to me. I examine the tank as he hands me a note that was with it as he explains what it says.
"It's probably only a prank, but it could be dangerous, maybe I should analyze it thoroughly." I adjust how I'm holding it, but it slips out of my hands. I fumble, trying to get it, and see Ash try as well. I grab the nozzle, and he grabs the valve, accidentally turning it. I feel a strong suction from the nozzle, and it escapes my grasp, latching onto my mouth. I immediately start feeling weaker, as my I feel my breath sucked out of me.
It works! I realize in horror. I try to pull the nozzle out of my mouth but it's no use! It feels like it's adhered to my mouth! I see Ash and his Pikachu looking on in shock. I start to feel really odd. I look down to see my body acting like a juice box being sucked empty, as it starts getting flatter. My legs lose the mass to support me and give out. Moments later, I'm completely hollowed out, and the tank slides out.
"Oh no!" Ash cries out. "I killed Officer Jenny!"
I'm not dead! Put my air back in me! Unfortunately, he doesn't seem to hear me.
"I'll go to jail! This can't be happening!" Ash continues his freakout, before his Pikachu zaps him. "Thank you Pikachu, I needed that!"
Yes, now can you please re-inflate me!? He still doesn't seem to hear me, and neither does his Pikachu, come to think of it.
---
After moving my deflated body, my clothes, and my motorcycle (with surprising ease) to an area where we wouldn't be seen if anyone walks by (with no one having been around to hear his freakout earlier), he crosses his arms to think.
"Now I have to figure out what to do..." He mumbles. "This Jenny can't just suddenly disappear..." He suddenly looks at the tank. "The note said that if someone wears the skinsuit, they will look exactly like the person!" The Pikachu doesn't look like he's fully on board, but lets Ash go for it. Ash picks me up, and looks quizzically, searching around for something. "She doesn’t seem to have a zipper or anything... I guess I'll have to use a hole already there."
Oh, please don't go up my vagina! My fears were unwarranted, as he goes to my mouth, testing it to see that it has become super stretchy. If I had any say in how my body reacts, my instincts would be to blush and turn away, because he strips us both.
He puts his foot in, lining it up with mine. I wiggle my toes under his command. I'm not sure what feels more awkward, the emptiness I was just feeling, or having no control of my body as someone directs my movements. He slides his other leg in, then he slides his arms in, and lifts the suit I've become up so that my mouth is around his neck as he slips everything into place, ending with my head, sliding it up and over to cover his own like a mask, adjusting it to fit everything in place.
He's now in my skin, however, he doesn't have my form; the suit I've become is pressed up tight against him, making him look like a boy cosplaying an Officer Jenny. My breasts are currently deflated, and I feel a bulge between my legs under my skin, as well a a lump at my throat. He turns my head to look at the tank, then walks me over to it.
Well, here it goes... He puts the nozzle in our mouths and turns the valve the opposite way of before. I feel a rush of air flow into me, feeling like the deepest breath that I've ever taken in my life.
My arms and legs begin returning to normal length and tone, my waist shrinks while my hips and butt inflate to normal size, my nipples start to itch and grow as my breasts balloon out, becoming full again, my face shifted from a boyish appearance to my natural feminine shape, with my lips thinkening, to complete it, I feel a tingling in my crotch and throat as his penis and adam's apple vanish.
I pull the nozzle out.
Am I back? This, unfortunately, shows that I still have no control, as proven when I try to wiggle my fingers, to no avail. He still can't seem to hear me, and makes no signs of even noticing my attempts. I stumble a bit as I try to walk, a weird sensation of unfamiliararity with the body I've lived my entire life in filling me, my breasts seem to especially effect my center of gravity. I get in front of one of my motorcycle's mirrors and examine myself with an amazed look.
"Amazing! I've completely become the Officer Jenny! Even my voice changed!" I exclaim. I get a look at my naked body, and blush.
Will you at least get dressed before someone sees me!? Fortunately, Ash agrees with me, because I walk over to my uniform, and proceed to get dressed. I get most of my clothes on easily, but have a lot of trouble with my bra, no surprise, since a boy is the one calling the shots in my movements. With a groan, I give up, throw it in Ash's bag, and put on my shirt. My bare nipples rubbing against my shirt was a distracting sensation. I start walking, but stumble as I lose balance in the high-heels that have never inconvenienced me before.
"This is bad, it won't matter that I look exactly like Officer Jenny if I can't imitate her. I'll be discovered!" I say with a sigh. Suddenly, I started seeing some of my memories. I give a grin.
"You're under arrest for Pokémon theft!" I suddenly declare, posing exactly like I normally would when confronting a criminal; legs parted, left hand on my hip, pointing forward with my right hand, and a stern glare on my face, my tone was even identical to usual. I hold the pose for a second before giggling. "Wow, I'm sure that not even Brock could realize I'm not Jenny!"
Brock? The former Pewter City Gym Leader? I haven't heard about him in a while. He'd hit on several of my aunts, cousins, sisters, nieces, and even my mother once. They told me several stories about him, and how, despite how it might appear from hitting on every Jenny or Joy he sees, that's as far as it went. The stories they tell always involve him traveling with at least a girl and a boy with a Pika- That's why he seems so familiar!
I pick up all of Ash's things, including the air tank, and put them into his bag, except for a single Poké Ball I detach from his belt. I turn to Pikachu.
"I'm sorry buddy, I know that you hate it, but I need that you return to your Poké Ball." I tell his Pikachu, who complains. "Trust me, I know, but if this Jenny was seen with a Pikachu she's never had before, it would cause questions. I'll let you out as soon as I get to her house, she'll be off duty in about ten minutes." Pikachu grumbles but agrees. I put his bag in a hidden compartment on my motorcycle where the I always store my things, put Pikachu's Poké Ball on my belt, right next to my Growlithe's Ball, then get on the motorcycle, and drive off.
---
I arrive at my house, and dismount my cycle. I see one of my neighbors in his yard.
"Hello there, Andrea!" He says with a smile. I smile and wave back.
"Hey Bart!" I respond with a wave... no different from how I would normally greet him.
---
Upon stepping into my house, I close the door and let Ash's Pikachu out. He shudders and frowns at me, but I go to my cupboard and bring him some expensive Pokémon food that I usually use as a reward for Growlithe for an excellent job. While Pikachu is eating, I go to my bedroom and stand in front of a full body mirror, admiring myself.
"Wow, now I can understand why Brock likes every Officer Jenny, they're very sexy, or I should say, I'm very sexy." I say with a laugh.
It really feels awkward to talk so familiarly about someone I've never met. I suddenly begin undressing. Upon getting undressed, I begin playing with my breasts.
"Now I have an additional pair of Poké Balls." I joke. I would groan if able.
That was horrible! My eyes wander to my vagina, and I trace it with a finger.
"Wow, it's strange that I don't have a penis right now." I say a sentence I never would have thought I'd ever utter. I bring my hand to it, and insert it. I feel a wave of pleasure. I continue playing with it with my right hand, while my left goes to town on my breasts. I eventually orgasm, and stain the floor with my juices. I begin panting, weak in the knees, before I stand and pose again, except with a grin.
"Get ready world, because there's a new Officer Jenny in town!" I declare.