It seemed like it would have just been a harmless experience for them both to have at first. It wasn't really that hard for Jon to hide the fact that 'he' was anatomically female or for Karyn to hide the fact that 'she' was anatomically male. Jon could stuff a sock in the front of his pants to avoid his crotch looking very suspiciously flat and kept up the ruse in gym class as necessary, while everyone around Karyn suddenly found it very strange that this tomboy suddenly was wearing skirts, but ironically of course it was more female clothing that hid a certain male feature. Jon had forgiven Karyn for pushing him around and Karyn had long since decided to dismiss the issue of Jon trying to kill her right after she had sprung what she had on him, considering it really could be interpreted as a gross betrayal of friendship. And their friendship was once again strong, and now they were lovers. And it looked like there weren't going to be any more complications. Just a young man and a young woman enjoying some extraordinary possibilities before them, regardless of whichever one of them was the woman and whichever was the man. That was, until about two weeks later.
It was a Saturday. Fortunately. Jon woke up to the sound of the phone ringing.
"Hello?" he answered.
"Jon, have you had any changes?" a strange voice asked him.
"Ummmmm..." Jon answered back. "Who is this?"
"It's Karyn!"
"Karyn?" Jon said back, surprised.
"Jon, my voice is cracking!"
"Oh, shit! The testosterone?"
"Yeah. I've also suddenly got a mustache this morning. Like, a SERIOUS mustache. And the start of a beard!"
"Oh. You know Karyn, I appreciate that you have kept up with your promise, but I'm releasing you from it now, you can take off the dick and balls. I guess we should have considered this might happen. What are, what are you going to do?"
"Well it should be easy for me to hide it with new body parts, I can just put on a new face for now, I should have probably done that before calling you so that I wasn't talking to you with this weird voice, and in another two weeks when the stone is active again we can fix it for real, but what about you, have you noticed any changes? You know, because of estrogen in your own system?"
"No not real... oh shit," Jon said, looking down. For now he had decent-sized breasts. They had grown to maybe B-cup size overnight. That was fast! Weren't men on estrogen to lead into getting sex-change surgery supposed to take several months to develop breasts?
"Yeah, yeah," Jon coughed, and resuming in a somewhat higher, more feminine voice, "now that you mention it, um, hold on," he said, putting down the phone and racing toward the bathroom connected to his bedroom to look in the mirror. "Oh, shit," Jon said. "I'm looking seriously like a girl now," he, or she, said, at her reflection. For Jon now looked very much like a sister she never had. She ran back to the phone, her boobs slightly jiggling. "Yeah Karyn, I, really look like a girl now. Do I, sound like one?"
"No, but your voice is definitely higher. I think you should just get over here, and I'll just put you back the way you should be. I'll leave my front door unlocked for you. Just come straight up to my room."
"Right. I'll see you in a few minutes."
In Karyn's room:
"Wow, Jon, you're actually, very pretty," Karyn said through a big smile. She had clearly taken care of her own problems while Jon was getting there. Her face and voice were not masculinized at all.
"Yeah go ahead, make fun of me," Jon said, dejected.
"Hey I wasn't making fun of you, I was genuinely paying you a compliment, you really make a very pretty girl, Jon. I really mean that as a compliment, no underhanded meaning to it. You're really hot like this."
"Oh, well tha..." Jon started, before Karyn roughly kissed her.
"Um, Karyn?" Jon asked, as she relented to Karyn directing her to raise her arms so as to let Karyn take off her shirt.
"What?" Karyn asked back as she pulled Jon's shirt off, to smile approvingly at Jon's new breasts.
"What is this?"
"What do you think it is? How many times have we done it the last two weeks. Are you not ok with it now?"
"No, we can have sex, theoretically, but what about your parents? And I thought you were going to fix me, also, you said you weren't a lesbian, that first time when I looked like Sarah with a dick, you only very reluctantly did it with me and kept your eyes closed, so why do you suddenly seem, very enthusiastic?"
"One, Jon, they're gone all morning, to look at some stupid antique shop. Two, it wasn't because you looked like any old girl, it was because you looked like SARAH. And three, as for not being a lesbian, I don't know, tastes change. Or maybe, it's just, Jon as a girl, that's another matter. Not just any girl, but girl-Jon, I would have played for that team, any time. I don't know why, but this is really doing it for me. I can fix you, AFTERWARDS, ok?"
"Well you won't see me complaining," Jon said, as Karyn slid her pants and undies down, leaving her totally naked.
"Wow, you're totally a girl now Jon! Not just your face and breasts, but your figure too!"
"I guess so," Jon said with a little smile, realizing that wasn't meant to hurt her feelings. Karyn stripped down herself. To Jon's satisfaction, she was wearing the DD breasts herself. They embraced, Jon's much smaller breasts squishing against Karyn's big ones. Then Jon pushed her over onto the bed.
"Oh, you want to be on top again?" Karyn asked. "If there's one thing I like more than girl-Jon, I think it might be aggressive girl-Jon."
"Just stay still, would you?" Jon asked, before successfully sliding it all the way in to the base. The idea would have been horrifying to Jon before 2 weeks earlier, but now, she wanted nothing more than to feel Karyn's dong all the way inside of her, to feel Karyn's heartbeat through it. She guessed Karyn was right, about tastes changing. Jon wondered, would he feel differently when he was back to normal? Would he think back on this with revulsion? She hoped not. After all, it wasn't gross, because it wasn't just any dick that was in her, it was Karyn's. The dick of the girl that Jon had always loved. Such a paradox, and an impossibility.
"I'm sorry Jon!" Karyn said, embarrassed. "I can't, stop it..."
"Already? We didn't even slide it in and out?!" Jon said, exasperated. "At least give me a chance would you? What can I do with this ahhh, welllll... just let it out, let it all out into me, Karyn." Jon had to stop herself from admitting out loud how much she liked the feeling of Karyn ejaculating into her, of making Karyn ejaculate into her. They always say sex inherently involves subjugation of the female by the male because physically it was him inserting something into her and filling her through his own actions, but to Jon, it seemed kind of like the other way around, like Karyn was her prisoner, and was being forced to do what Jon commanded. It's not like Karyn could stop it from happening at this point, after all. It made Jon happy just to know she made Karyn come so easily, and she honestly wasn't hell-bent on having an orgasm herself anyway. She was happy just knowing Karyn was happy and enjoying herself.
"Hold on," Karyn said, "I can't let it end like that, I can't let possibly your last moments as a female ever end with bad sex, and I've got two perfectly good hands to finish the job with after all. Especially since this time unlike every other time you had a girl's parts below, you actually have breasts this time. It's such a waste for you never to experience... in fact..." Karyn reached into the drawer and pulled out another pair of arms. She stuck them onto herself right under her original arms, and now had 4. "This should be pretty good for you." She then groped Jon's breasts from behind with her top two hands, rhythmically squeezing them, and fingered her downstairs with two fingers of her lower left hand and played with Jon's clitoris with her lower right. It was only a few seconds before Jon was screaming as she experienced the full female experience finally for the first time. And she really did hope it wouldn't be the last. She had come to like having female genitals, but wasn't averse to the idea of really trying out being a girl as well, looking like this, feeling like this, being Karyn's girlfriend. But of course now would be the time to put an end to the current experiment until they could get a better idea of what was happening to them with the help of the magic rock. She also really appreciated the consideration from Karyn to make sure Jon didn't end her time as a female with bad sex, as she said. It seemed like Karyn maybe had grown as a person.
Both of them feeling much more cheerful after their strange sexual escapade, they did still have some concerns now though.
"All right, let's get that pussy off of you," Karyn said to Jon, her bottom pair of arms folded in front of her big breasts, her top left hand cupping her own cheek and chin and her top right hand scratching the top of her head. "But I want to warn you, whatever happens Jon, don't freak out."
"Wuh, why do you say that," Jon asked Karyn suspiciously.
"Take a look at my own junk," Karyn said.
"I'd honestly rather not," Jon admitted. Feeling it inside her vagina, a new part of her designed to accept it, was one thing, but Jon still wasn't actually thrilled about the idea of looking at a dick and balls, not even Karyn's, her sexual orientation hadn't actually flipped and that was why she was glad Karyn's figure and face and voice were plenty feminine after all.
"Just look at it, would you?"
"I don't know what you expect me to holy shit..."
Karyn was holding open the left and right sides of her scrotum to reveal a vulva. "I already took it off Jon. I took off the dick and balls, before we had sex, with me as the male, and this is what my default equipment had changed to. I'm a hermaphrodite, as far as I can tell."
Jon looked and probed at Karyn's genitals. Sure enough, basically it was the female reproductive system, but with one ball on each side of the slit in a sort of abbreviated half-scrotum for each one which wasn't nearly so loose and wrinkly as a normal scrotum, and her clitoris had been replaced by a dick. Which also meant, this truly was Karyn's natural own equipment now, not some additions created by something other than her own body. Truly that had been Karyn's dick Jon had in her earlier. That kind of made it even more ok than it already was, in Jon's opinion. Jon had only one question at the forefront of her mind.
"So where do you pee from now?"
"Both," answered Karyn.
"Wow," Jon said.
"Yeah it's hard, not to make a mess. And you know, I only have been like this for a few minutes you know so it's only by chance that I even knew how to answer that question but when I took the penis and balls off, I guess my bladder shrunk a bit and I really had to go to the bathroom. But my point is, after I take off what you have, don't be surprised, if it's not, what it should be. But we can fix it in two weeks. If you want to. I'm going to tell you, I think I like being like this, having both sets, and maybe want to stay like this for good, so long as I can wish to be immune to the male secondary sexual traits creeping in. I don't know about having the second pair of arms, I'm starting to really like that too, but probably only in private. As for you, whatever you want is your decision, just don't be too shocked, if you're different."
"All right. Well, I've been warned. And we can fix it with the stone later, as you said. And even if my default appearance has changed, you can cover it up with new parts until then, so it should be fine," Jon explained.
"All right, here I go," Karyn warned. She pulled off the female reproductive system she had installed into Jon, and both of them on the edge of their seats so to speak, they saw that what was left afterwards, was now...
