Till Friday, when Cassidy visits.

You didn't have much real sex over the next couple days, but you did get up to a lot of fucking. Automaton Dave was perfectly compliant for you to use him however you wanted.

Meanwhile, you called in sick to Carrie's job at the university and skipped all her Uni classes. You didn't want to take over just yet till the situation with your new family was resolved. Also you were still getting used to the new you. Reading diaries, researching your life history.

Carrie was majoring in Economics as a Junior (by year, not credits). Considering you'd already graduated college, you figured a second run would be easy enough. Changing majors might be a pain, but college was supposed to be a pain. This time you'd major in Art instead of Computer Science, because why not?

When you were a teenager you got really into drawing comics, but fell out of it when the grind of classes and jobs set on. The reality of making a life for yourself put your passions second. You didn't have to make that sacrifice twice.

With Dave, you had a fine job already, with a on-the-ground management position at a startup founded by a couple of your old college buddies. You made plenty of money to afford an apartment in the city, and then some. If you kept your body working there and kept the income, in this new body, you didn't even need to hold down a job anymore. You could focus on your art, and on school.

The thought excited you, the idea of just focusing on you. You felt young. Like you were a kid again, when your parents were still writing some of the checks. Except this time, you'd be writing your own checks, paying it forward to you.

But another thing excited you about tonight, and made you a bit nervous too. Cassidy called after Automoton Dave got home from work and started on dinner (on your order, grilled chicken and pasta). Carrie's little sister was on her way and she'd be here by midnight.

Naurally, you sent your body to bed early so you could start preparations.

--

A knock at the door. It's 11:54PM.

You hurried to answer, cinching your robe shut, your hair wet but freshly brushed thanks to Dave. You meant to get dressed but... well you've been having a few lazy days. It's what happens when you don't have to go to work or class or please a girlfriend or anything.

Cassidy greeted you at the door, with a tired smile and a small overnight bag over her shoulder. She had brown hair, like yours, with a cute face and youthful figure, 20 years old.

Carrie's little sister threw her arms around you befeore you managed a word. "I couldn't stop worrying about you!" said Cassidy. "I've been thinking about what you said - just tell me this isn't anything bad!"

You laughed, and hugged Cassidy back. She's thinner than you thought, like a lankier version of yourself. "It's not anything bad, I promise. But come with me, right now! The longer this takes - well I don't want anything getting more complicated than it has to be."

With Cassidy confused, you led her into the apartment and took her back to your small office / computer room.

"Where's Dave?" asked Cassidy, looking all around her.

"Oh, uh, he went to bed early. He's been working really hard for me, he's a trooper," you said.

You have been working your old body really hard. Making Dave do overtime for the extra income, fucking him without letting him cum. It's a lot easier to clean up after sex when there's not a bunch of jizz left everywhere inside and outside and in the sheets, plus you can go as long and hard as you want. Not cumming keeps your old body at full mast and at peak performance as often as you want.

You showed Cassidy into the office, and sat her in the main office chair. You sat in the second folding chair you had tucked in there. It was close quarters, but good enough for now.

You reached for the helmet on the table.

Cassidy set her overnight bag down and gave you and the device a quizzical look. "You're up to something."

You froze. "What? No, I just wanted to show you something real quick."

"I've been on the road for three hours," accused Cassidy, her expression disbelieving. "You barely said a word to me, and I get here, and instead of spilling the beans, you sit me in this chair. What's really going on?"

"Okay, okay, I'll spill," you said, slowing down. You were getting ahead of yourself. You picked up the helmet and showed it to Carrie's little sister.

She took it in hand, examining it. A bundle of cables came out the back and plugged into your rig, and a multitude of blinking lights covered the rest. Aesthetics weren't on your mind when you were making the thing.

"What is this?" she asked.

"It's a device that allows you to enter and control someone's body," you told her.

Cassidy gave you a disbelieving look. "That's impossible."

"No it's not. That why I called you here. I wanted to show you, I knew you wouldn't believe it if I told you!"

"Where'd you even get this? You don't know a thing about comptuers," said Cassidy.

You suppressed a laugh. Carrie really was computer illitereate, but no more. "Dave made it," you explain with a wave. "You know how he works for a tech start up. He's a genius."

"Dave's a lot of things, but we both know he's no genius," said Cassidy. "He got the time wrong on your first date."

"That's not how that was. You weren't there. It was a great date," you huffed, angry she hadn't put the helmet on yet. This is exactly what you didn't want to have to deal with.

Cassidy laughed now. "That's not what you told me when it happened."

You turned red. "Maybe I did say that, but in hindsight - look, nevermind what happened. This is about Dave's invention that lets you possess people."

"That still sounds insane," she said.

"It won't sound insane when you try it," you say.

"I'm not sure. This all seems super sketchy," said Cassidy.

You reached out and touched her hand. "Please. Just... trust me on this. Just this once?"

Cassidy sighed and relented. "Okay. Just this once. Because I'm already here. But you owe me big time. I thought you were in trouble, or... or I don't even know. I thought maybe Dave did something to you? I know that's mean to say, but the last couple guys you dated both turned out bad..."

"Dave's different," you said, feeling a little guilty, but not too much. "Dave does whatever I tell him to. And part of that is because this device, this helmet, it let him see my point of view. Or let me see his. Let me show you. But it'll only work if you let it. So let it. You'll need to leave your body first before I'll be able to do the next step."

Cassidy still wasn't sure, but you put the helmet on her head anyway and strapped it down.

"Are you sure this will work? And it's totally reversible if it does, right?" asked an increasingly nervous Cassidy.

"Yes, it's all fully reversible," you said.

Truthfully, you've still never reversed the process before. This'll be the first time putting someone back in a body from a file. Except it won't be Cassidy going back in...

"Try and relax. Close your eyes," you said. "It'll work easier that way."

Carrie's little sister tried her best to relax, but you could tell it was hard for her. Still, a touch to her hand, a word of reassurance from her sister's voice was enough to put her at ease.

With that, you started the program. A few minutes of quiet, Cassidy soothed by you holding her hand.

Suddenly she jerked in place. Almost like she was jolting awake from almost falling asleep. Cassidy, however, make no further movement. Instead of jolting awake, she was just spasming as her mind went to permanent sleep, at least as herself.

You checked your computer. Next to Carrie's file, TEST1, was a second file, Cassidy's. TEST2. You renamed TEST1 to CARRIE and TEST2 to CARRIE'S SISTER. Better to not mix those two up.

With that done, you opened CARRIE with the helmet program, and typed the command for it to write the personality file back to wetware.

A few more minutes passed, the helmet on Cassidy lighting up like a city at night. She trembled. Shook. And then, after an intense moment, she shifted in place, her mouth looking unsure.

"Did it work?" asked Cassidy, suddenly.

But there's something to her voice. Her mood. Her intonation.

"Carrie?" you asked.

"Who... Dave?" asked Cassidy, turning to you slightly. She couldn't see for the helmet, and was too worried about messing something up to take it off.

For your girlfriend, no time would have passed at all. One second, you put the helmet on her. Then she was stored as a file until this second, when you put her in her little sister's body.

Aware this might be a shock to Carrie, since you couldn't tell her when you changed your mind about her body, or your other plans, you proceed carefully, and gently. To start, you helped her take off the helmet.

Cassidy blinked in surprise at you. "You're me," she said. "It worked!"

You smiled and touched her face. "It did. Your body is amazing."

Cassidy, now Carrie, finally noticed her own body. She touched her face, looked down at her more petite, slender figure. "I'm not in your body? My voice - who is this?"

You steeled yourself. "You're in your sister Cassidy's body now," you explain. "It's... been a couple days."

Carrie gave you her signature arched eyebrow look, and touched her face. "Oh fuck. This is Cassidy's face. I'm really in Cassidy's body." She jumped up and looked herself over. Cassidy had been wearing a cute red flannel shirt and a pair of jeans. She could scarcely believe her eyes, ears, or skin. "Dave, how did you talk her into this? My little sister's a lot of things, but she's not experimental."

"About that," you said, worrying your slender hands. "You said you'd do anything, right?"

Carrie went still and bit her lower lip. A much more impish, guilty look than you ever thought you'd see on Cassidy's cherubic face. She nodded, cheeks heating red with arousal."I love you. I meant what I said. I'd do anything for you. Anything you want."

You stand and take a deep breath, and take Carrie's hands. "Then... let me keep your body. Forever."

Carrie's eyes went wide, and then she smirked at you. "That's so messed up. You want to be me? Fuck Dave, what about your real body?"

"I copied my personality, edited it a bit, and put it back in once I was in you," you say, grinning and squeezing your girlfriend's sister's hands.

A lock of wet hair fell in front of your eye, jostled from when you stood. Carrie reached up and brushed it from your brow, every ounce of tenderness preserved. You weren't as tall as you used to be, but you were still a few inches on Carrie's little sister.

It was like you were still a man, in your own body, and Carrie was still in hers. But to an outside observer, it would just be two sisters sharing an intimate moment.

"I said I'd do anything you wanted," Carrie giggled. "I never thought it'd mean giving up my body to my boyfriend. Scratch that, I thought I'd be giving you my body, but not like this. So what do I do, then? What happens to me? Should I be in your body? Or. I guess, if you have a copy of yourself, is this where you say goodbye and get rid of me?"

Far from sounding distressed, Carrie actually sounded kind of turned on by the idea. Cassidy's eyes were hooded, and a special warm smile lingered on her face.

"Actually none of those," you said, suddenly feeling more embrassed yourself. "Actually I wanted you to do something else, besides let me keep your body."

Carrie was all ears. She listened attentively, and shifted her weight from one foot to the other. Her hands squeezed yours tight.

There was no easy way to break this one, so you just got it over fast.

"I want you to take Cassidy's body," you said.

Carrie's eyes widened. Her hands froze. "You didn't ask Cass to do this. You tricked her."

You swallowed, and nodded. Was this the limit? Had you pushed too far? Should you have deleted Carrie when you had the chance?

But then Carrie's smile returned, bigger than ever. "God this is crazy. I'll do it." Then she laughed. "You thought I wouldn't?"

"You said anything, but most people have a limit on that," you said, feeling a great weight lift off your chest. You let go of her hands and kicked your bare feet against the carpet. "I figured it'd be way easier to have you be Cassidy than try to pretend to be you around her. I want to be my own version of Carrie, no offense."

"None taken. It's your body, your choice, after all," said your now younger girlfriend, as she tossed Cassidy's stolen hair over her other shoulder. "So who do we put Cassidy into?"

You shook your head and glanced to the computer. "About that."

Carrie's eyebrows shot up. "About that?"