Part 1 (aka the first 2 "chapters") of something I've been writing for myself since I got a lot of positive reception from me asking. This is similar to something I wrote in book 2 to vent some feelings.

I thought that this job would be easy. Break in, steal some technology and get home before the cops showed up you know? Nope. Turns out the doc had an assistant that knew how to kick my ass into next week and managed to tie me up. How was a 5'2, 15 year old girl able to take down 3 adult male thieves? Maybe she did that stuff for fun.
"So, Ariel, since you managed to capture these scumbags, you decide what to do with them." The doc said, obviously having a sick expression on his face.
"Don't you mean Nohrian Scum? Anyways..." Then, the girl started to whisper into his ear, probably having almost a sick of a plan as the doctor. I could manage being put into a fairy princess dress. I used to do that with my younger cousins all the time, but it seemed like this kid was the type to write the most descriptive transformation and death scenes. Then, the kid finished whispering into the doctor's ear and he gave a nod to it before he handed her 3 blindfolds, one for each of us. Wait.... What was this kid doing to us!? I think I met someone that's more batshit crazy than my ex, and I don't even know this kid! Everything went black due to the blindfold, and I could barely hear anything. Were they keeping this a surprise or was there some sort of noise blocking thing on? I had some time to maybe think of a way to get out of this mess. Possibly save my skin. Unlikely though. Hopefully it doesn't involve my death or anything else that could be considered a fetish. Those weirdos on Deviantart... Not that I'm knocking it, it's a good website, there just needs to be more mature filters. All of a sudden, I could actually hear stuff again.
"Alright. Which one's going first?" I could hear the doc ask before feeling a hand being placed on my shoulder.
"Wait sir. I didn't mean to break in. This was the only job I can get. I can't even do a minimum wage job without getting fired." I quickly spat out, and hey, at least I was being honest.
"I'm sorry about that, but, I'm giving you a job that you can't possibly mess up at least." I heard a girl's voice say. Probably the doctor's assistant if I can remember from her battle cries that make Owain/Odin seem normal.
"I've got a reputation to uphold. Plus, this is for the better. I'm keeping you three out of jail." The doctor sighed.
"Could I at least have the blindfold removed?" I asked.
"As you wish." The girl said as she removed the cloth from around my eyes. For a 15 year old girl she doesn't look half bad but like I said, I'm a grown man, not a pedophile. Maybe if the circumstances weren't so bad, we could've been friends.
"First off, I'm gonna need you to remove your clothes." She calmly admitted.
"Could I at least have some privacy?" I asked, obviously embarrassed.
"We won't look." They replied at the same time, before turning around so I could take my clothes off. Before I got myself completely naked I asked "Underwear off too?"
"No, please leave that on. I am still technically a minor." The girl replied as she got one of those stretchers they use in hospitals.
"So I get on that?" I asked.
"Yep." She replied. I climbed up onto it, the metal feeling cold on my bare, pale skin. I slowly eased myself into laying on it, and once I was completely laying down, the girl strapped my hands and legs to the stretcher.
"I'm guessing I don't want to know."
"Exactly." She said as she wheeled me over to a platform, and when the doctor got on it, it slowly started to descend. Soon, we were at a giant door, that looked really high tech and futuristic. Younger, more innocent me would've loved this. Except for the part where I'm strapped to a cold metal rolling table. That would've scared me as much as it is now. The doctor opened the door and the girl rolled me about halfway in before stopping and letting go.
"Well bud, this is where my part ends. Hope you enjoy the show." She said before starting to leave.
"Wait! I didn't get your name!" I said frantically.
"Ariel. I suggest you get used to calling me that." She replied.
"Well Ariel, thanks for making an attempt, despite being a really weird attempt to turn my life around." I said before she gave slight smile and quickly left. The door shut quickly and loudly after she left. Damn. What now? Then, a light blue light covered my body, which actually kind of tickled.

After the light went away, everything was really awkward until my body felt strange. From what I could see, it looked like my man parts were getting smaller!? My chest was also getting flatter and looking more childlike. Out of the corner of my eye, I could see my jet black hair getting longer and turning a light brownish gray sort of color. I couldn't tell in the dark lighting.
"What's going on!?" I asked myself, very loudly I might add, to which my voice was higher pitched than normal. It sounded really familiar to be honest. Like I've heard it somewhere before. Another more familiar light of a lamp filled the room again as a mirror popped in front of my face. My hair had gotten out of my face, revealing an oddly clear forehead. Now this was starting to feel like I was in a bad dream, which I wasn't. My eyelids were forcibly held open and something was put in my eyes. When my eyelids were able to blink again, it turned out that green circle contact lenses that were typically used for cosplay were placed in my eyes. I knew who this was, but I couldn't place an exact guess. Then, everything seemed like it was getting bigger, but I was getting smaller. My height went from a solid 6'0 to a measly 2'4. It hit me. I figured out who this was. It was someone from Fire Emblem, though I didn't remember his name. All I remembered was that you had to fight him on the dlc path Revelations. I don't remember much else of that game due to when I was playing it, I was on a high of Mountain Dew, Skittles, and other candies I had stolen from our leader. He didn't seem to mind about that though. Then, the room was flooded with a darker blue light. I could feel my joints getting stiffer and my mouth being forced into a smile almost the size of that of a certain pun loving skeleton. I managed to turn my head and take a look at myself through the reflection through the glass. I think when I realized what this kid's name was, it felt like a ton of bricks falling on me. This was that kid from Valla, Anthony. Why would this girl want him? Then again I fell in love with a girl from an earlier game. Personal preferences I guess. All of a sudden, my back was in pain. Apparently, something was being shoved into my back and connected to my vocal cords so I couldn't speak. A string came out of this wound and was quickly stitched up. So basically I was turned into a doll. Great. At least I know she's a fan of Fire Emblem. Again, we needed to meet up in better circumstances. Soon, my brain started to be filled with new memories, trying to rid myself of my old identity. I had to keep a grip on my old identity, but if I didn't struggle, this would go over a lot better. I guess I could lose a bit of memories. My brain hurts too much. Then, after I had let a few memories go, I heard the door open. Probably Ariel. She walked over and undid the straps before sitting me up.
"So Tony? How does it feel to be actually alive and not with that monster?" She asked in the most sincere voice I've ever heard while tugging gently on the string protruding out of my back.
"Good, but my body really hurts." I replied. Wait, some outside force was controlling my voice. I would've asked why the hell she did this to me rather than that.
"Now let's get you into some clothes that are more, size appropriate." She said as she picked me up and placed me on her back. As she did this, I realized that my underwear were way too big for me. No wonder she said size appropriate, and how was she able to carry me on her back like this!? She looks like the type who barely passes gym, but then again she kicked my ass a while back. Who knows really. When we walked out of the tunnel, my comrades were staring in horror.
"Bro, what did she do to you?" All I did was give a shrug and Ariel gave an evil look. She soon sat me down on a more comfortable chair and put a shirt over my body, after which wrapping it with a beigeish green jacket. I honestly felt a lot more comfortable now that I had clothes on, and they felt warm, like they had come fresh out of the dryer. I had noticed that a more smaller pair of underwear was on alongside a pair of brown shorts and boots.
"Now Tony, let's get you to bed." Ariel said as she picked me up bridal style. Maybe this new body wasn't so bad after all.

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Here's what I've gotten so far from tonight's events.
There's a girl that can kick 3 grown men's ass.
She's sadistic af
She turned Hitsuji into her personal plaything (in which she has horrible taste in characters. Why a brat that attempted to murder you?)

"So? Which one of you are next?" She asked with the most fucking sadistic ass grin I've ever seen. Underfell Sans can go to hell, this girl is essentially Satan, and I've met a lot of assholes in my day. Both me and my partner shook our heads know because we knew what she did to him.
"Eenie,meanie,miny, mo." She said as she waved her index finger between me and my partner. Of course it had to land on me.
"You know the drill, take your clothes off except for your underwear, and get on the stretcher. Don't worry, it's clean from the last time." She said. I grumbled and started to take my clothes off when I was stopped by my partner
"It was an amazing time working with you." He told me, being pretty damn honest about it.
"You too." I replied as I got on the stretcher, naked except for my underwear before that crazy girl strapped me down. Guess there really is no escape. She wheeled me over to the same platform she did Hitsuji with the doctor and we were lowered into the tunnel where I'd be punished. He opened the door and the girl wheeled me inside.
"You know, you ain't the quietest thinker." She told me sarcastically. Damn, she knew about that? "So maybe this new life will teach you to be a little more respectful." Then, the girl left me. What the hell man!? After the girl left, a red light filled the room, which was pretty annoying. It was like when someone wants to tickle you with a feather, it's annoying and you want to punch them in the face.
From what I could see, it looked like my body was being more filled out in it's arms and legs and my arms looked like actual arms instead of noodle things. Yeah, I was skinny as hell, and whatever was happening was making me look like a human being. I felt my hair change even though I couldn't see it. Then a goddamn mirror was shoved in my face and so was something in my fucking eyes. When I could blink, I saw that my eyes were reddish brown and my hair was soft red and kind of messy, but the neat kind of messy.
"The hell?" I asked myself, and it turns out my voice had changed into a voice that could sooth a hyped up caffine addict. What was this girl turning me into.... Wait a fucking second. It was a character from one of those trash games that Hisuji played! I couldn't even remember any of their names so why should I care. Then, my body was flipped around so my face was on the cold ass bench. I couldn't tell what was going on but it hurt like a bitch. It felt like something was being shoved into my back. Which hurt. A lot. Then it felt like something was being tied up in my lower gut which hurt even worse. The pain started to subside and I was turned onto my front side, which didn't help the pain as much. Then another dark red light filled the room. What the hell was it with all these lights? It's fucking annoying and it needs to stop! It felt like my skin was turning into hard plastic, like I was being turned into a store manniquen. If it weren't for the straps, I'd be out of here. I can handle a transformation, you know, so I can hide my identity, but this is going too far. All of a sudden, after my skin had stiffened into plastic, my brain had started to flood with new memories. A shit ton of new memories started to flood my brain and it hurted like a bitch even more so than the thing shoved into my back. I had to keep my old memories, I had to be me... but those memories won out against my willpower. I felt my eyelids closing as the door opened, probably the girl.
"So Lukas." She said as she walked over, presumably to unstrap me. "Did you learn some respect?" My head was forcibly nodding yes. So what was shoved in my back, was probably a frame to be controlled like a puppet. After she unstrapped me from the table, she started to playfully twirl a strand of my now soft, red hair around one of her fingers. "We're gonna have so much fun together." My body was forcibly sat up, and after which, I manage to catch out of the corner of my eye, I saw her holding something. It looked like a remote for an RC car. So that's what she was controlling me with!? Was she able to control my voice as well!? I could be saying stuff that I don't want to say and I have no control over myself. This kid was a mad genius. After she finished messing with my hair, she picked me up, bridal style, and carried me into the room where we once were, and placed me on a soft carpet, and started to take off my underwear. Wait, didn't she say that she was a minor? So why was she doing this? Then, I realized I wasn't just on carpet. There was something crinkling under my lower back. Oh no.
"Look, I know that this seems embarrassing, but you know this is the only course of action since you got that scar." She said as she got some white powder. My suspicions were confirmed, she was putting me in a diaper like those wierd people on the Internet. I looked over to see Hitsuji's transformed body laying on the couch, appearing to be asleep, but he had this forced grin on his face that made him look like Sans. How could he sleep at a time like this!? We're being turned into playthings! After the white object of infantilism was placed on me securely, it was covered by dark brown dress pants and tightly secured by a light brown belt that felt so tight I couldn't breathe if I even could breathe anymore, most likely to keep that diaper as close to my body as possible. Then, she put a long sleeve soft red shirt on me, to make me completely clothed. She then put me underneath the other one, to make it seem like we were close. Not transformed, maybe, right now, no.
"Well darling, I guess I've got myself some friends for once." The girl said, smiled and then walked off to prepare the last of us.