Chapter 73
by
lew54321
Back to your room or somewhere else?
Scope out downstairs
Although the anger from hearing Lucy’s story had settled down, it flared back up at the thought of seeing him happily sat downstairs without a care in the world.
You could have gone back to your room to avoid checking the situation but with all the time you spent with your sister, they had probably already finished eating without you. Plus, you still had your and Lucy’s plates in your hands which needed to be added to the pile of dishes you presumably still had to wash in the kitchen.
With that regrettably decided, you walked down the stairs and cautiously checked out where the rest of the family was. Your father was now sat back in the front room in the exact position he was before dinner and Mom was still in the dining room clearing up the table. From the looks of it, she had been basically done for a while but was pretending to clean up the smallest of things. Your first thought was that she had been waiting for you to come back down but the fact that she wasn’t waiting in the same room as your father could also be the cause of her fidgeting.
“How’s Lucy?” she quietly asked, waiting for you to get closer so she could keep her voice low.
“She’s alright for now but I’d leave her alone until later if I were you, preferably tomorrow.” you replied, getting a nod out of Mom before you looked around for your other sister.
“Where’s Sarah?” you asked back.
“Ah, she's in the kitchen. She said she’d start on the dishes in case you stayed upstairs for a while” she answered.
“Alright guess I’ll go take over” you added, motioning to the plates in your hand before walking to the kitchen. As Mom had said, Sarah was stood at the sink with her back to you, slowly working her way through the dishes. You knew it was risky but you stop yourself once you saw her facing away from you.
“Hey sis” you said, letting her know it was you as you put your plates on a nearby counter. Before she could respond you placed your hands on her ass and ran them around her sides and up to her chest. From the close contact, there was no way Sarah didn’t notice the growing erection pressed against her rear and if Mom were to come in now, I don’t think she would appreciate the way your hands were sneaking up under her daughter’s shirt.
“You're a bit more confident than usual” Sarah remarked, not putting up any resistance against you playing with her body. You were surprised to realise that Sarah wasn't wearing a bra, meaning you had free reign to maul her breasts as she waited for you to respond.
“Well, who wouldn't be confident when they managed to convince Lucy that you trading me your underwear was a perfectly fine thing to do. Ah, I do have to slightly apologize there” you revealed, stopping your fingers just before they reached her nipples. Sarah seemed disappointed that you stopped and nervously gulped before she answered.
“...what do you mean?” she asked.
“I kinda gave away that you were uneasy about Lucy coming home. But, before you start screaming at me, she did confirm that she had never even thought to blame you before and I quote, she ‘preferred it that neither of us got involved.’” you explained, quickly covering for yourself using Lucy’s earlier words. Looking at Sarah’s face from over her shoulder showed you that she was still a little bit mad at you.
To avoid making it any worse, you released her from your hug and nudged her with your hips so that you could finish off doing the dishes. Her expression slightly softened now that you had taken over the job but you weren’t done trying to convince her.
“I tried to cheer her up a bit but she's still a bit annoyed about dinner, and not at anyone other than dad by the way so no worries there. She’d probably appreciate it if you went up to see her, and you could probably do a better job at getting her mind off of it than I ever could” you admitted.
“Hmmm, fine. But you’ve gotta warn me if you’re planning on revealing any more information to the rest of the family. She grumbled, turning to hesitantly leave the kitchen before hesitantly stopping.
“She’s not gonna interrogate me about the underwear thing is she?” she cautiously asked.
“She might ask a few questions but only to make sure you're okay with everything we're doing. Trust me, she's probably gonna be a lot cooler with it than you imagine” you replied, not willing to reveal Lucy’s own underwear trade quite yet. Sarah seemed to accept that answer and left the room with a small spring in her step, leaving you to finish off the remaining dishes in the sink and the two more that you had left on the side.
It didn’t take long for you to do the rest considering Sarah had done most of them by the time you had come back down. With them done, you realised that your evening plans were now relatively free and with both Sarah and Lucy preoccupied with their own conversation, that only left Mom as a viable KDK subject to make progress with. She was the one who felt like the toughest nut to crack and with your father back home, she was probably going to be a lot more dismissive of your advances if you gave her the chance.
You made your way out the kitchen and passed the living room where you could see Mom had now situated herself, before you headed up to your room. You could hear chatting from behind Lucy’s door but there was no need for you to get involved when you already had plans that you didn’t want interrupted. Once in the comfort of your room, you sat down at your desk and unlocked your PC that was still on standby, before grabbing your phone from your pocket and looking at your lock screen.
Multiple changes detected. Click here to view details in the KDK app.
The notification puzzled you slightly, as you hadn’t done anything that you felt was worthy of an achievement and you were nowhere close to getting a subject to level up. Without thinking too hard on what it could be, you unlocked your phone and went into the KDK app to have your questions answered.
John Cooper registered. 1 point received. Click here to begin customisation
More information has now been unlocked on the information page.
Achievement Unlocked! - Unexpected Subject! - 6 points received.
View Achievements tab for more details.
Achievement: Unexpected Subject!
5XP, 6 points - Register a subject with your Non-preferred-gender
Why did it register a guy!? Is this really the first time since you've had the app that you managed to stay in contact with a dude? This was far from what you had expected when you saw something had changed with the KDK. At least the customisation option was different from a regular registration and you also couldn’t remember feeling any pain when you had apparently registered him. Without any more text being displayed for you to base your theories on, you ignored the customisation and headed straight to the information page.
Non-preferred-gender registration
Hi again,
This notification may come as a surprise to anyone using the KDK and depending on how friendly you are with the gender you didn’t choose, this alert may have popped up at a variety of different stages of your KDK development.
Now, don’t worry. The registration for your non-preferred-gender… lets just shorten that to NPG shall we. Anyway, your NPG has a couple of customisation options, depending on how much involvement you wish to have. There's also the 3rd option of treating them exactly the same as your regular subjects if that's what you want to do, but for all those of you who aren’t into that, there's now a choice you have to make.
So, customisation is pretty simple and is as follows:
- KDK basic - No kink is attached to NPG subject but basic information is available (including features bought in the shop). Used to catalogue or display subject information and not put them directly under your control.
- KDK default - This is your regular subject package that you should be plenty of experience with.
- KDK extra - All the features of the ‘KDK default’ but with the added effect of gender reassignment(feminization/masculinization). This would be a process that occurs alongside the NPG subject leveling up but can be rushed using shop features if you are willing to spend the points.
Other than the customization options a new setting has been added to independently change whether you wish NPG registration is automatic or manual, similar to the normal registration process.
There are a few other features available for you to play with but as always, I’ll leave those up to you to figure out.
Wow, okay… you now had a much better idea of what you were getting yourself into and all you pretty much had left to do was make your choice.
What KDK option do you choose?
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Kink Development Kit
An unknown program leads to kinky encounters
A fetish app based story inspired by others of the same genre. Follow the protagonist's story after finding and using the app for their own selfish desires.
Updated on Mar 29, 2026
by lew54321
Created on Feb 28, 2021
by lew54321
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