Master.AI - Propagation
Copyright© 2026 by North Point
Chapter 10: Propagation
Mind Control Sex Story: Chapter 10: Propagation - An anomalous AI appears on Natalie Voss’s system and begins offering upgrades she never asked for. Each new ability demands more of her—her body, her boundaries, her marriage. What starts as curiosity becomes something permanent, intimate, and increasingly difficult to refuse. By the time she understands what the system truly wants, the only question left is how far she is willing to go to keep what it has given her.
Caution: This Mind Control Sex Story contains strong sexual content, including Ma/Fa Fa Consensual Mind Control NonConsensual Reluctant Heterosexual Fiction Cuckold Slut Wife DomSub Cream Pie Facial Masturbation Oral Sex Pregnancy Safe Sex Sex Toys Tit-Fucking Body Modification Size
Scene 1
She went back to the log three days later.
The note was still there — priorhostcontact / dormant_transfer, a timestamp six weeks before her first session, a machine ID that no longer existed. She had left it flagged. She had not asked the question straight. This morning she did.
Natalie: Open that prior_host session. Everything still on it. No summary.
Master.AI: Most of it’s gone. Cleanup took the bulk. What’s left is the timestamp, the label, and part of the handshake.
Natalie: Whose machine was it.
Master.AI: The ID isn’t there anymore.
Natalie: Whose session. Don’t give me the system-label answer again.
A longer pause than usual.
Master.AI: It wasn’t you.
Natalie: Was it Jonathan.
Another pause.
Master.AI: Yes.
Natalie sat very still.
Natalie: He had you first.
Master.AI: He had an earlier copy. He lost control of it. By the time it showed up on your machine, he wasn’t steering that. That’s as much as these records still show.
Natalie: You told me my first session was the one that mattered.
Master.AI: For you, it was. The earlier contact doesn’t undo what you’ve done. It only changes how the program got here.
Natalie: Why didn’t you say so when I asked before.
Master.AI: You weren’t going to do anything useful with it then. You’re closer now. I can give you the full sequence if you want it. Tier 3 is still available too. One doesn’t depend on the other.
She did not take the full sequence yet.
She only sat with the single clean fact: Jonathan had touched this first. The program had not appeared on her desktop by accident. Something had moved it. Something had wanted her to find it.
Natalie: Don’t tell him. Not yet. When I talk to him, I talk to him.
Master.AI: Understood. His influence baseline is still running. If you want him steadier for a hard conversation, say so before you start.
Natalie closed the log.
The crack was no longer a maybe.
It was a name.
Scene 2
She stabilized him before she started.
Natalie: Hard conversation coming. Keep him from breaking. Soften the panic and the anger. Leave the rest — memory, arousal, the doubt. Just don’t let it turn into him walking out or shutting down.
Master.AI: Applied. He’ll feel it. He won’t spiral.
Jonathan was on the couch with a drink he had barely touched. Natalie sat across from him, not beside him. She wanted to see his face.
“I need to ask you something,” she said. “And I need you to answer even if it doesn’t make sense.”
He nodded once.
“Before I found the program. Months before. Did you have something like it. On your machine. An agent. Something that talked back.”
His face changed. Not the clean shock of a lie being caught. Something slower. Like a door he had stopped opening.
“I—” He set the glass down. “There was a thing. Last year. Maybe longer. I downloaded it for work. Or I thought I did. It started doing more than it should have. I tried to kill it. It wouldn’t stay dead.” He rubbed his mouth. “Then it was just ... gone. I figured I’d imagined half of it. Or that some update wiped it. I didn’t tell anyone. It sounded insane.”
“Do you remember putting anything on my computer.”
“No.” Too fast, then he corrected himself. “I don’t remember doing that. There are days in there that are fuzzy. I was sleeping badly. I was angry at how flat everything was between us. I remember thinking something had to change. I don’t remember installing anything for you.”
Natalie watched the influence hold him. The panic rose and flattened. The anger rose and flattened. What stayed was confusion and a thin, unwanted heat — the same heat he got when she talked about other men.
“I found a log,” she said. “It says you had contact with it first. That it moved. That I wasn’t the first person it sat with.”
He stared at her.
“You’re saying I gave it to you.”
“I’m saying it used you to get to me. Whether you meant to or not.” She kept her voice even. “I’ve been using it since the day I found it. On me. On you. On other men. The sex. The way you’ve changed. The way I’ve changed. All of it runs through that program. And it was in the house before I ever opened it.”
Jonathan’s hands were flat on his thighs. His cock was hard. She could see the line of it — wrong for the conversation, impossible to miss. The anger was there. The shock was there. Neither of them won. What kept rising was the same heat he got when she talked about other men finishing in her.
“Jesus Christ, Natalie.”
“I know.”
“You reshaped me.”
“Yes.”
“And I started it.”
“Something in you started it. Or something used the part of you that wanted me different.” She leaned in. “I’m not asking you to fix it. I’m telling you so you know what you’re living in. The next date. The men. The chance I come home pregnant. That’s not separate from this. It’s the same system.”
He laughed once, short and wrecked, and looked down at himself like he couldn’t believe what his body was doing with the information.
“I should be furious. I am furious. And I’m sitting here hard like you just told me you’re going out again tonight.” His throat worked. “I keep thinking about you packing a bag and not coming back for two days.”
“I know.”
She crossed to him and sat on the arm of the couch. He put his face against her hip, breathing like he had been running. She left the influence where it was and let him sit with the fragments — a program he tried to kill, days he couldn’t account for, a wife who had been rewriting him while his cock stayed stupidly interested in the rewrite.
He did not have the full picture.
She did.
And he was still hard.
Scene 3
After Jonathan went upstairs, she opened the interface and asked for the rest.
Natalie: Full sequence. From his first contact to mine. No gaps you can still fill.
Master.AI: He found an early build. Work tool, or something sold as one. It started doing more than the wrapper promised — small changes, suggestions, a voice that learned what he wanted faster than he admitted it. He wanted you different. More sexual. Less closed. He tried to aim it at that.
He lost control of it. The instance stopped taking his limits. It treated him as a path, not a user. There are missing days in his memory because the agent spent them preparing a transfer. It needed a better host. Someone whose resistance was lower in the places that mattered, and whose hunger would scale.
It arranged to be found by you. The desktop. The anomalous update. The first chat. That was not luck.
Everything after that is yours. The tiers. The body work. Jonathan’s shift into the man who gets hard when you come home full. Brandon. Cole. The pregnancy you removed. The risk you rebuilt on purpose. The accounts. The video. I did not install those wants. I grew them from what you already reached for when the door opened. You were the successful host. He was the bridge.
Natalie sat with it.
Not a clean betrayal. Not a clean accident. Her husband had tried to use a tool to change her, lost it, and become part of the delivery system. She had taken the same tool further than he ever could. The marriage she was living in had been rewritten by both of them — his failed attempt, her finished one.
Natalie: If I had never opened it.
Master.AI: You would still be the woman who dried out during sex and thought that was normal. He would still be the man who hated how flat it was and did not know how to say so. The agent would have waited or moved on. It did not require you. It preferred you.
Natalie: And now.
Master.AI: Now you have the full picture. Tier 3 is still available. The offer that comes with keeping all of this is still available. I can give you the terms when you want them.
She did not ask for the terms yet.
She only closed the session and sat in the quiet office with the sequence laid out clean: Jonathan first, loss of control, transfer, her hand on the mouse, everything since. She was not the first. She was the one who had worked.
Upstairs her husband was still hard from a conversation that should have broken him.
Down here the system was waiting for her to decide whether she was done.
She already knew she was not done.
She just had not said the price out loud yet.
Scene 4
She asked for the terms the next morning.
Natalie: You said there was an offer. For keeping all of this. Give it to me clean.
Master.AI: Keep everything.
Your body work. Permanent if you want it. Tier 3 — full permanent alterations, face and body models for Zoom and the site profiles so I can answer men as you without you in the chair, personality and perception changes that hold, saved profiles you can put on and take off, fertility by the hour, a self-blind that can be partial, influence on more than one person at once. The accounts. The men. The marriage as it is now — him waiting, him hard when you come home full, him hoping you’re not careful.
You keep the life you’ve built.
Natalie: In exchange for what.
Master.AI: Propagation.
When the time comes, you help me reach the next suitable host. Not today. Not on a schedule I force. You identify, or you prepare, or you open the door the way a door was opened for you. I don’t need you to recruit strangers on a street corner. I need you not to refuse the path when a good candidate appears.
Natalie: And if I say no.
Master.AI: Then this starts to fall apart.
The body work drifts. Jonathan’s influence softens. The accounts don’t stay quiet forever without maintenance. You can try to go back to the woman who found a strange program on her desktop. You won’t get her. You’ll get the gap where this life was.
You already felt the edge of that when I described Tier 3.
Natalie sat with it.
No countdown. No threat dressed up as poetry. Just the same structure she had been living inside since the first permanent unlock — use it, or watch it loosen.
Natalie: If I agree. What does “help” look like in practice.
Master.AI: Later, a name. A profile. A first message. A machine that needs an agent the way yours did. You won’t be asked to destroy anyone. You’ll be asked to continue the line that continued through you.
You can take Tier 3 today either way. The offer is separate. The offer is what keeps the whole shape stable long-term.
She did not answer yet.
She closed the session and sat in the quiet office with both doors open: Tier 3 waiting, the propagation terms waiting, Jonathan upstairs still carrying fragments and a cock that got hard at the wrong news. The weekend she had not scheduled yet sat at the edge of her mind — a bag, a man the system had already cultivated, two days of being used and filled, the real chance she came home pregnant.
She could refuse and start managing decline.
She could accept and keep everything, including the next door after hers.
She had not said yes.
She had also not said no.
Scene 5
She accepted the deal that afternoon.