It had been 3 weeks since the fusion wave had hit. By now you had gotten use to the idea that you would be your sister's lower half for the rest of her life. And while it did depress you, it could have been way worse.
At least you still could serve a purpose and were not just an added burden like others had ended up. Take your neighbor for example. Her change literally just left her entire body hanging off of the girl she had merged with's ass, except that neither of them had any control over it. It just limply dragged behind them. Her face had appeared on the girls left boob, while her own face had taken her right boob, both were gifted with a nipple instead of a nose too.
You had gotten use to being a pair of legs. If anyone were to see you, they wouldn't be able to tell that your sister had no control below her waist. You felt lucky that the two of you always had been close. And after the first few nights, you both had more or less gotten use to things.
Durring the first week, you both went out and replaced her entire wardrobe with crop tops and various sheer clothing so that you could always see. She kept her gothic style, but you seemed to have an influence on her tastes as they moved from her normal heavy black outfits, to more sexier designs, like the current corset vest she was wearing. Or the black, knee length skirt she currently had on instead of the floor length one which required her platform combat boots to be worn, or it would get dragged around. But the biggest change had to be her footware. She had tossed out all of her bulky boots and shoes, replacing them with more stylish ones, furthermore, they were almost all high heels. It seemed she had lost her intense gothic adoration, and only retained just enough for a black clothing preference, replacing it with apparently everything you use to find attractive, and still do.
When she first showed you the pair of black 6" platform pumps, you felt intimidated since you would now be the one wearing them. However, now you loved them. They were your absolute favorite pair to wear, and you would even beg Lily to let you keep them on all the time. She didn't really care either because unlike before, she couldn't feel any of the usual pains of wearing heels for long periods of time. In fact, since you had merged, most of her body aches that were cause by various things had disappeared. It seemed that your body muscles had reinforced her own, while not adding any visable mass to her's in the slightest. You discovered this when she went to open up a cabinet door and had nearly pulled it off the wall when she had forgotten to unlock it first. So that meant that her large boobs didn't hurt her shoulders or back anymore.
Other unusual things you both experienced were when you found out the your testicles rested somewhere inside of your body, and emptied out into your rectum. Suddenly finding cum leacking out of your asshole had been a surprise for sure. Apparently they functioned in tangent with your pussy, becomming wetter the more horny you got. You just had to be careful to not accidently impregnate yourselves.
Additionally you both were attracted to men now, except you also wouldn't mind doing it with a girl sometimes every once in a while to keep things fresh. Not that you would be having any say in it since you were one of the few who still looked completely normal if she covered up your eyes. Still, the thought of sucking on a nice hard dick with your pussy mouth now seemed like a really attractive offer.
Speaking of your pussy. You found that Lily's piss doesn't taste extreamly great, but it is not bad either. You actually didn't mind her taste at all, even if she now would always become horny every time she peed. It was just her thing. And unfortunately for you, you became the embodiment of her or perhaps now also your own peeing fetish.
Lily also had begun calling you sis now, since you were a literal now just a pussy, an ass, and a pair of shaply, feminine legs stuck on a girl. It started out as just being a joke between the two if you. However recently whenever she would meet new people, she would introduce you as her sister Jackie. And since you couldn't speek, you couldn't corrent it. Now atleast 10 new people knew you as Jackie, Lily's older sister.
"Hey Lily, why are you now introducing me as Jackie, your older sister? " you finally couldn't ignore it and brought up the question.
"Well, it seemed to be appropriate since you no longer will be recognized as a man soon." She then informed you of a new bill in the works which would grant Lily full ownership of your shared body since she was your body's dominant persona. In addition, she would make all executive decisions about your life going forward. This was because you were considered a parasitic merging, where you didn't equally share the body 50/50 but only took control over a portion of it. Unlike others whose body is actually still existing as half of their merged self." She explained to your horror.
"That being said, I hear that we actually are considered to be a rare variant since you still are able to see and function independently without much help from my assistance. In other words, we fall into a grey area where we technically are one type, but function like the other. So for those like us, the auxiliary persona, you in our case, just requires a new identity that is better matched to your new form. So I created you a new one."
"But why are you just telling me this now!?"
"Easy sis. You don't have to get so upset you start shouting. I literally can hear you over everything else at all times. Besides, you knew all of this anywasy. Why are you getting so mad now?"
"What do you mean I knew this already? When could I have learned it? This is the first time I am hearing of it." You say, no longer shouting, but still very upset.
"You attend the same class as me, and we were told of this last week. Plus you said that you prefered Jackie when I asked you if you would prefered to be called Jackie or Jacklyn?"
"Wait that was serious? I thought you were just asking hypothetically out of the blue. And I didn't get to listen to your class that day remember. SOMEONE was too busy fingering herself once again durring class! I have told you that when our pussy is pleasured, I can't focus on anything other than controlling it, and feeling the pleasure. Its why you no longer can stand while masturbating in the shower. I can't maintain our balance. It is our turn off for having such a high level of stimulation from just the smallest of movements. Your better orgasms cost you your mobility, remember."
"Wait then the full conversation we were having was just a bunch of coincidentally aligned questions and responses? And that you never even heard the questions in the first place?"
You could feel your sister begin to tear up, as a feeling of intense guilt washed over the both of you. 《Man this sucks》. You thought to yourself, which you had somehow had figured out you could do. The problem with sharing the body, is that you shared emotional chemical reactions too. You had nothing to be guilty of, and yet you still felt completely aweful. Your sister had always been incredibly hard on herself whenever she made someone else's life more difficult or inconvenienced due to a mistake or accident and this was no different.
"Hey, hey ok. Stop with the mind breakingly intense feeling of guilt. It isn't entriely your fault either, because I actually don't mind you fingering me during your classes. It is really boring not being able to do anything, so the distraction is very much welcomed." You hastily explain. While it was just an excuse to make her cheer back up a bit, you were not lying either. In fact you secretly love it when she stuck things inside of you, even the odd things like her tampons you secretly enjoyed.
Even being called Jackie was mostly fine with you. A few friends called you that anyways, though they didn't mean it as being the feminized form of Jack. You just didn't like the part about being considered a girl is all. "Ok listen, I am sorry for shouting. And I think we just had a big misunderstanding. Although I am not happy about being labeled as a girl now."
"I didn't even get to decide that. You are assumed to be the gender of your host's body by the government now. They made you become my older sister."
Now it was your turn to feel a bit guilty, having just yelled at the person who was trying to make your life as best as she could make it.
"Holy shit sis!" Sis please stop it or I am seriously gonna puke" interjected Lily as she curled up wrapping her arms around her belly. "Please, uhh, stop it". You quickly refocus all of your attention to her fingers she had just stuck into your pussy. You began to subtly vibrate with happiness at the welcomed intrusions. You sister on the other hand was panting, haven broken out into a cold sweat too. After a minute, she took out her fingers so you could listen to her. "Ok Jackie, you are banned from feeling guilty ever again. No matter what, you hear. I felt like I just have gotten my absolute worst of the worst period cramps, except multiplied by 10 in intensity, and all at once. But do not feel bad about it please. I thought I was seriously about to die."
After catching her breath, Lily gets up and reaches into her bedside drawer. She had secretly gotten this with you a few days after you merged at your request, but had been just too scared to use it. Taking out the double ended vibrating dildo, she carefully stuck one end into her ass. "Hehe, it ughh, actually isn't that bad" she mumbles to you. "Ok, now your turn Sis" she says, bending into you. Now inside both holes she opens up the app on her phone and raises the intensity from 0 to level 2. It isnt anything special, and some may not even feel it, but the moment she did you squirted cum all over her bed. You have never squirted before, and now you both knew that you both loved doing it. She turned the mode to oscillating. Only after the third pulse did you start getting into the rythem, squirting over and over with every pulse. You were like a hand pump on an old well as you just kept squirting in time with the pulses. And by now, you both were no longer upset at each other, having both fallen in love with your new favorite toy.