Found by Stepsis

The door to my bedroom opened and my heart raced. Or at least it would’ve if I still had one. Currently I was transformed into a four-inch tall, plastic Funko-Pop style version of myself naked. I was half-buried in packing peanuts in a partially open box, partially covered in the folded note to my girlfriend.

From the otherwise empty room, I heard the voice of my stepsister Katie talking to herself.

“Alright Austin,” she started.

I nearly had a heart attack thinking that she was addressing me directly, but my fears faded as she continued.

“So your text said to… what was it again?” there was a pause where I presume she looked at her phone. “‘Find the box in my room, tape it closed, and take it to the post office.’ So this must be the box you were talking about.”

Holy shit, it was working. Katie was going to do it, she was going to mail me to my girlfriend! This was going to be great.

“Oh this is addressed to Gwen, that’s your girlfriend isn’t it?” Katie asked aloud. “I wonder what you would send your girlfriend. Let’s have a look, shall we…”

As the box flaps shifted and the light pouring into the box got brighter, panic gripped me. She wasn’t supposed to look in the box, she was just supposed to close it and mail it! The box opened fully and I could see her face.

My stepsister, my mom’s husband’s daughter, really was beautiful. She was petite, but curvy with toned muscles from her many hours in the gym. Her dark red hair fell down around her pleasant, round face as she looked down at me. She was a few years older than me, her being twenty two and me having only just turned nineteen, those few more years making her all that much more attractive.

Katie was wearing a loose black tshirt, over equally loose gym shorts, the kind that only barely cover the upper thigh and hang away from the skin, promising to give a full view if she lifted her leg just right.

The crush I wouldn’t allow myself to admit out loud caused me to feel like I was blushing, though luckily my plastic body didn’t actually have blood to rush to my face. Katie pushed the folded note aside, revealing my full body to her in all its plastic glory.

“Did he… is he really sending a naked plastic toy of himself to his girlfriend?” Katie laughed as her giant hand wrapped around me and lifted me. I could feel her warm fingers on my skin, sending a shiver through me. I admitted that I enjoyed the feeling of her hand on me more than I would say.

“Wow, those two must be into some weird stuff…” Katie’s eyes shifted back to the box. “Oh is that a note?”

She put me down quickly and picked up the paper and unfolded. If embarrassment could kill, I would’ve died at that moment. Being seen in this state was bad enough, but I don’t think I would recover from the humiliation of her realizing that the naked toy was actually me.

“Okay let’s see what Austin wrote to his girlfriend…”

If I had blood, it would’ve run cold at that moment.

“...‘Surprise! I know you wanted to play around with your transformation fantasy, and I wanted to surprise you with it, but I never knew how,’ awe, he’s supporting his girl! ‘But then the Transform-It app added a new feature: TF Hand-overs. So one user can give another control over their TF with a code…”

Knowing what I wrote, I dreaded the next sentence, but Katie didn’t miss a beat.

“‘...So I transformed myself into this toy version of myself…’ What? He transformed himself into…”

Katie burst out laughing and looked down at me over the top of my note for a moment. I was wrong earlier, THIS is where I would’ve died from embarrassment…

“You transformed yourself? So this little toy is actually you Austin?” Katie’s expression looked like she was thinking hard. “So you were going to get ME to mail you to your girlfriend, huh? I guess that makes sense, you can’t really do that yourself. Wait… you were talking about handing over your transformation…”

She trailed off, going back to the note quickly. 

“‘So all you need to do is put the following code into your Transform-It app and you’ll be able to transform me into whatever you want for as long as you want. Just in case something goes wrong, I built a timer into my TF and will automatically turn back in four days unless you change it. Have fun, and don’t go easy on me!’ So if someone else, say I was to put this code into the Transform-It app…?”

A chill ran through me. Was Katie actually going to take over my transformation? And what the hell would she do with me? We’ve been stepsiblings for around eight months now, but I have to say I don’t know her well enough to guess at what she would do. I watched as she put the folded note down and picked up her phone, tapping through it for a moment. She looked back at my note a few times, checking the code as she put it in. I was in shock, my brain numb as I watched the secret for my girlfriend turn into being controlled by my stepsister.

“You know, I’ve uh,” Katie started, not looking at me as she spoke, like she was nervous about something. “I’ve kind of had a crush on you for a while. I didn’t let myself admit it, but I guess this is a perfect time to say it! You can’t respond and make this awkward, so um… yeah. Anyway, the code’s in so you’re mine now! Oh, and I disabled your automatic reversion, so you’re mine until I decide that you get to be human again!”

She scooped up the box and note and carried all of us into her room, which up until this year was my mom’s home office. Katie dumped the box onto the bed, before scooping me up and looking over me while biting her lip and smiling. Her other finger slowly came into view and gently circled around my cock and balls. I yelped in my mind, the sensation of her giant finger both aroused and terrified me. Katie giggled and set me down on her computer desk so I was standing on my feet and looking into the room.

“Let me take care of the evidence while I think of what to do with you first!” Katie giggled and ran off with the box and note.

I was left completely numb. I didn’t know how I felt about being discovered and hijacked by my stepsister. Her admission of having a crush on me certainly didn’t help me feel good about my situation. What would that mean? Would she just play pranks on her transformed stepbrother like full siblings would? Or, given her apparent attraction to me, would she do something… else? I didn’t even want to think what she might do, though thoughts of what my girlfriend would’ve likely done crept into my head and I was forced to imagine Katie doing all of that instead.

My musings were interrupted by Katie returning in a hurry. She rushed in like she had something exciting to tell me and ran right over to me. Dropping down onto her knees, she put her arms on the desk in front of me and rested her chin on them.

“So I figured out what to do with you first!”

Her voice was so excited and giddy that I practically blushed. It was almost like my long-time crush came up to me unprompted and asked me out on the perfect date.

“But I’m going to keep it a secret!” Katie jumped up as soon as she finished. Before I knew it, I was starting to change again. It was a weird sensation, my head started to grow, turning my lips into something resembling their normal size. At the same time my body shrank down and molded into my head. Though even as my head grew, it shrank, changing size in a confusing way that I couldn’t fully wrap my head around. But then it all stopped, leaving me still with the ability to see just like before.

Katie giggled excitedly and jumped up and down a few times. Her excitement betrayed the fact that she wasn’t wearing a bra, her chest moving freely under her shirt. Almost frantically, she scooped me up, her hands wrapping fully around what must have been my body. In a dizzying flash of movement, she was standing in front of her closet, and the full-length mirror mounted to the door.

What I saw confused me. She had transformed me into a flesh-colored, mouth fleshlight, my realistic lips on full display. I was stunned, the feeling of numbness kept its hold on me. Not only had she turned me into a sex toy, but she had turned me into a sex toy for a MAN. What the hell was she going to do with me? She didn’t have a boyfriend that I knew of.

“So I bet you have questions, so let me show you something that very few people know about,” Katie explained, turning away from the mirror and setting me down on the bed facing her. She stepped back and put her hands on her hips, taking a hold of her gym shorts. After a short pause and a deep breath, she pulled her shorts free of her hips and let them fall to the ground. She wasn’t wearing anything under those shorts, but that wasn’t what struck me.

I was shocked to see that she had a penis and testicles hanging from between her legs! A few conflicting feelings washed over me in a moment. First, I was shocked to see that she had male anatomy, second, I was jealous that hers appeared to be bigger than mine despite her being shorter than me, third, I was relieved that she wasn't going to use me on a man, and fourth, I was terrified of her using me on herself.

“So I’m not a transwoman, if that’s what you’re wondering,” Katie explained. “I was born like this. I didn’t even realize I was different until I was almost in high school. And I’ve dated men and I’ve dated women, and I gotta say… it’s really hard to find someone willing to suck it!”

Before I could start to work out exactly what I was feeling at this deeply weird and intimate discovery, Katie leaned forward, causing her ever-hardening cock to sway beneath her as she picked me up in two hands.

“So be a good little stepbrother,” he brought me to her face and gave me a long, slow, romantic kiss on my rubber lips. It felt like she was actually kissing my real-life human lips. It felt good. When she broke away from the kiss, there was a hunger in her eyes. “And suck my fat cock like swallowing my jizz will cure cancer.”

A chill ran through me at her incredibly sexually charged demand. I couldn’t lie, even though I didn’t have a penis anymore, I could feel that shiver of arousal run through it. And with that, my view started to move down, putting my point of view very close to her body as she lowered me toward her hips. As I passed her chest, I could see her nipples poking through her shirt. Before I could stop myself, I found myself wishing that she had taken her top off as well.

But then I found myself face to face with her now very hard cock and I had other things to worry about. I knew from her kiss earlier that it would feel like I was putting my mouth on her and a chill ran through me. Then Katie pressed the tip of her penis to my lips. To my diminutive size, it felt like I was trying to press a grapefruit into my mouth. Though to my surprise, my lips parted enough to easily accept her giant cock. From the moment she touched me, I could feel the contours of her skin, that distinct pattern of a circumcised tip very clear to me, like I was reading braille.

Katie moaned above me, clearly enjoying the sensation of my mouth on her penis. She pressed further, and her tip popped past my lips, introducing the slightly salty flavor of her unwashed skin. As she pressed deeper, my lips moved over the veins of her shaft, again feeling every single change in the surface of her skin. I panicked as she started to hit what felt like the back of my tongue, but no matter how deep she sank into me, I never gagged. My mouth cavity simply opened more and more to allow for her impressive girth.

As Katie pressed deeper and deeper, she moaned, her sexual, feminine sounds sending that shiver through my nonexistent penis again and again. And then my lips touched the skin of her body, leaving her entire penis buried inside me. I got a chill when I realized that I was feeling the skin of her ballsack on my lower lip.

“This is good and all,” Katie spoke, nearly making me jump. In all the sensations, I had forgotten this was an actual woman I was with. “But I need some effort on your part.”

Just as I was wondering what effort my inanimate self could possibly make, I felt her finger slide down my back and flip a switch that I didn’t know was there. If I could have, I would have jumped out of my skin at what happened next. My lips and tongue, and somehow the inside of my mouth, started working against her furiously as the toy I was transformed into automatically sucked her appendage.

Katie immediately screamed to the room, her other hand immediately going to grab onto me, leaving her with both hands wrapped around my body as if the new motion would otherwise force me to pop right off of her.

“Holy fuck…” she moaned under her lips and started to work me up and down her shaft. The constant movement of her penis combined with the sucking motion I was forced into made it nearly impossible to tell what was going on. All I knew was that I was in fact sucking her giant cock like it would cure cancer.

Katie sounded like she stepped out of a porno, such was the sounds she was making. Listening to her was making me incredibly horny. At that moment, I had forgotten about my plans to see my girlfriend, forgot that this woman was my stepsister, and just allowed myself to enjoy listening to her. And the fact that it was ME that was ripping these noises out of her was incredibly hot, even if I was sucking a cock to do it.

And then suddenly I felt a hot, thick liquid filled my mouth, announced by Katie’s scream of the most intense pleasure. The sensation was unexpected, but not as bad as I expected. Though I did shiver thinking about what it actually was.

“Oh fuck,” Katie muttered above me, flipping my switch and stopping my frantic movements on her penis. “Oh you and I are going to have a lot of fun, stepbrother…”

I admit that I didn’t really know how to feel about what she just told me…