"Hun, come look at this news story I just found on the internet."

"What's it about, Babe?"

"It's about our favorite topic, X-CHANGE. You know how those stories on Literotica are our favorite fantasy? Well, it looks like maybe our fantasy is becoming scientific reality!"

"No way!"

"Well, see for yourself. This biochemist in San Francisco has started building gene-editing kits to sell to the public. They are do-it-yourself GMO (Genetically Modified Organism) kits for anyone who wants to try it. It says here that it comes with all the instructions for using the CRISPR* gene-editing tool that scientists have been experimenting with. Remember, you're the one who said you'd like to get your hands on CRISPR to try some experiments. Well, it looks like you got your wish, and that means that we get our wish."

(*CRISPR-Cas9. CRISPRs are specialized stretches of DNA. The protein Cas9 is an enzyme that acts like a pair of molecular scissors, capable of cutting strands of DNA.)

"Do you think it's safe?"

"Well, it says here that the biochemist that sells the kits even uses it to experiment on himself and has injected himself in public settings. He's still alive and selling kits, so I guess it's OK."

"What do you say, Hun? Shall we go for it?"

"I vote YES! Let's send for it today—and see if you can get express shipping on it."

***

"They said to expect delivery tomorrow, so that gives us time to plan how we're going to work this out."

"What do you mean?"

"Well, for instance, I think we should go one at a time. That way, if there are any unwanted problems, the other can take care of the one going through X-CHANGE."

"That makes good sense. Who will go first?"

"I volunteer. I am really excited to try it out. I have always wondered what it would be like to be a guy. I can't imagine what it feels like to walk around with all that stuff between your legs. But it sure explains why so many men are guilty of manspreading. You guys have to make room for all your stuff to not be crunched together. And you know how much I love cocks. I can't wait to have one of my own to play with."

"But you have mine to play with any time you want!"

"Yes, and I love it, but I want to see what it feels like to have one and to FEEL what it feels like to play with it, and feel it get hard."

"Well, I volunteer, too! I want to have a pussy and breasts just as much as you want cock and balls!"

"Then there's only one way to solve this."

"Rock—paper--scissors?"

"Ready? GO!"

"My paper covers your rock. I guess I go first."

"Yes, you won fair and square. But we still have the rest of today and all of tonight to play with each other and fuck until the cows come home. Let's make the most of it. And let's save all your sperm and freeze it."

"Why?"

"Well, I don't want to think the worst, but I think we should have some saved up just in case we have trouble getting your balls back after the experiment. Better safe than sorry. In fact, I think we should extract as much sperm as possible. Do you think you can cum six times before tomorrow?"

"I think I'm willing to try! It's a tough job but someone has to do it."

***

Bryan signed for the package, closed the door and turned to Sheila. "Let's get started right away. I'm so excited! I can't wait until I have my own pussy and breasts."

"Babe, the first thing we have to do is to make some back-up copies of yours and my DNA. Once we change you to female, you will have all X chromosomes like me and I won't have your Y to grow my own cock."

"Good point, Hun. I guess all we have to do is swab the inside of our cheeks, label it, and put it safely in the freezer. Then we can change back and forth whenever we want."

Sheila had opened the kit while they talked, and announced, "Here's the swabs and test tubes to put them in."

Taking a swab, she rubbed it inside her cheek, put it into the test tube and labeled it. Then she did the same for Bryan.

"What's next, Hun?"

"Well, we have to swab our cheeks again to get the sample we will actually use. . . . . There, I'll put yours aside until later, and I'll use mine to get my X chromosome to give you my pussy and breasts. . . . . The instructions say to put that swab into this liquid and shake vigorously. . . . . Now I suck up the liquid into this syringe and inject you in your butt. Drop your drawers."

"OW! Did you use the square needle?"

"Don't be such a pussy. . . . . Oh, wait you DO want to become a pussy."

"Such a comedian! Wait until I stick you in the ass! . . . . When will that be?"

"The instructions say that different changes take a different length of time, so we will just have to wait it out. They suggest that you strip down and lie in bed and quietly observe the changes taking place."

***

"Comfortable, Babe?"

"Yeah, I'm fine. Do you see anything happening?"

"Not yet. Do you feel anything?"

"Well, my butt got really warm after you injected those X chromosomes into me, and the warmth is spreading down my legs and up into my torso and chest area. I feel very warm all over, and kind of tingly, too."

"Anything unpleasant?"

"No, I enjoy the feeling. How much time has passed?"

"Only about 10 minutes. The kit suggests that I record your feelings every 5 minutes."

***

"15 minutes, Babe. Anything new?"

"Yes, definitely! My cock is tingling like an electric shock. It doesn't hurt, but something is definitely happening. And I can feel my balls drawing up. Mostly, though, my nipples feel like they are going to explode."

"Let me check you over. . . . . Does it hurt when I rub your nipples?

"No. In fact it feels good—VERY good. Keep it up!"

"But I want to check down below. . . . . When I stroke your cock, how does that feel? I notice you aren't getting hard."

"It feels funny, different than before. But the head is REALLY sensitive. Please lick it for me. . . . . YES! That feels great!"

"I think your cock is starting to shrink up and the head will become your new clit. Now you know why I like it so much when you lick my clit! . . . . And your balls are definitely drawing up. I think they are getting smaller and will be drawn into your body where they will change to ovaries. We should have measured your balls before we started. I didn't think of doing that, and now it's too late."

"I don't care about the measurements—I just want it to happen, and the quicker the better! Then we can change you into a guy and you can fuck me!"

"True, Babe, but enjoy this part while you can. . . . . Oops! There goes one of your balls. It just drew back inside your body. . . . . And there goes the other one. . . . . Can you feel anything going on inside?"

"It still feels warm and tingly, and I do feel stuff moving around. It feels like stuff is stretching and shrinking, moving around and rearranging. . . . . I feel a lot of stretching on my chest. How are my breasts doing?"

"They are definitely coming along. You are a good A cup already and you have the sweetest nips! Mind if I suck on them a little? . . . . And they certainly feel different. I can tell that they are developing real milk ducts inside. The texture of your girl breasts is very different from your boy breasts. . . . . You know, you should be able to produce milk. . . . . WOW! I just imagined a time when I am a boy and I fucked you pregnant and you had a baby that you nurse, then later we change back and you fuck me pregnant and I have a baby that I nurse. We would have two kids and we would be mother to both and father to both. . . . . OK, you're a B cup now. You are really growing fast, and your cock has shriveled up. It is going to be the cutest clit you ever saw!"

"Do I have a pussy hole yet?"

"If you mean a vagina, no, but you have a very significant dimple where it is starting. And the skin of your ball sack has drawn up to be your pussy lips."

"I feel a lot of movement on the inside."

"Well, I can't see inside you but I suspect that it's your prostate growing to become your uterus. In a few minutes it should attach to this dimple that will be your vagina. . . . . I can't wait until I have a cock to stick into it! Babe I'm going to fuck you until you scream for me to stop! . . . . Oh, look, you're at least a C cup now. What beautiful tits, you have. If you don't stop growing soon, I'll become jealous of you!"

"Not to worry, I can tell that it is nearly done. The warmth and tingly feeling have nearly gone. How much time has elapsed?"

"About 25 minutes. Not bad! I hope mine goes as quickly. Do you feel like you can stand up?"

"Sure."

"Oh, Babe, I can't believe it's you! You look enough like me to almost be my twin. You are much shorter, your hips have grown, you have great thighs. You are a real BABE, Babe. Maybe I will want you to stay a girl. I'll know for sure after I fuck you. . . . . Speaking of which, do you feel ready to give me my injection?"

"Yeah, I feel like a million bucks, and horny as I have ever been. I'm ready to do you, then you can "do" me, and try out this virgin pussy."

"Here's your Y chromosome swab. Just drop it into this liquid and shake. OK, now draw some into this syringe and make me your man! . . . . OW! You're right, that injection is painful, but it will be worth it. Besides, I'm sure in time they will perfect it and maybe one day they will have X-CHANGE pills."

"OK, clothes off and onto the bed."

"I feel the warmth and tingling that you described. WOW! It's intense. I can feel my tits shrinking. That was fast. You didn't give me too much stuff did you?"

"I gave you the same amount you gave me."

"Something is happening fast in my abdomen. I'm going to guess my ovaries are turning into balls and trying to drop down and out."

"Yes, they will push into your pussy lips which will become the skin of your ball sack. And your uterus will shrink up and become your new prostate. But tell me about your clit."

"That's the most intense of all! I can definitely feel it growing."

"I can SEE it growing! You are going to have a pecker and a half. But that's OK with me. The bigger the cock you fuck me with, they better I will like it. . . . . Woah! One of your balls just dropped down. . . . . And there's the other. Hun, you are changing so fast I can barely keep up with the changes."

"I feel a little achy. I hope everything is alright."

"I think that is your bones growing and muscles stretching. You are visibly growing taller by the minute."

"I want to stand up. I feel like it is all done. How much time has elapsed?"

"Just over 15 minutes. Not bad. Careful standing up, you have a few more inches of height than you were used to before. . . . . I love you with hair on your chest, but mostly I love that woodie you're sporting."

"Yes, it's aching to find a home. Any suggestions?"

"Yes, my pussy is aching just as much, but be gentle; it's my first time as a bottom."