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Introduction:

William’s behavioural modifiers (Be-Mods) need a test subject, in a spontaneous moment he decides to test them on his 18yo disobedient step daughter.
#Content warning: mind control, non-consent

A brilliant medical engineer at the forefront of behavioural research tests out his behavioural modifiers (Be-Mods) on his disobedient and disrespectful step-daughter

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William had been working for Medi-Com as an engineer for almost 5 years now, he had been brought in to help research with cognitive and behavioural studies. Mainly they were researching how they could create devices to help modify and control people with behaviour issues, and compulsions they couldn't control. It had been a tough assignment and they had invested a lot of money into the research but William was confident they were there, they had cracked the code! What they had created was a small device, undetectable by the naked eye hidden behind the ear, and not felt by the user. It hadn't been tested on humans but the primate trials had been very promising. Almost 100% response to commands.

But today he was frustrated, his request for human trials had been thwarted by some bleeding heart politician who was worried about free-will or some bullshit. William was 52 now, he wanted this technology to be his legacy. The way he pitched it was, "imagine a young boy with ADHD is able to focus and is naughty all the time, this will change his life and put him on the path of being functional! Violent prison inmates no longer being dangers to the guards and other prisoners! Sex offenders who can't control their urges no longer being a threat to the public!" He called them Be-Mods!

But it fell on deaf ears. William was frustrated, and the worst part was he was going home to a moody 18 year step-daughter who seemed like it was her mission to make his life hell. No matter what he told his wife of 3.5 years she never properly disciplined Tamara. He was glad that she had been accepted to college a good 2hrs away, she was leaving in 6 weeks, but for now he needed to put up with her bullshit. His wife's name was Britney, she was 40 years old and kept herself in very good shape going to pilate, yoga, playing tennis, and other fitness activities. She was part Japanese, part caucasian, the Japanese part of her kept her figure slender, while her face was a clear mixture of white/Asian. Her brunette hair was long and flowing. Tamara was almost a exact clone of her in a younger body, the Asian features weren't so pronounced but she was very much in shape. She did dancing at high school and was in fact going to college to learn contemporary dance. William wasn't convinced it would land her a career but he was just glad she was going. She could go be a fucking waitress for all he cared.

He packed up 4 of the Be-Mods, he was going to take them home to analyse if there was a way to assure the politician they were safe to use. As he drove home he got a text from the wife, "pilates running long, grab pizza, Tamara waiting". He signed, "great time with just me and Tamara, just what he needed". He grabbed 2 large pizzas, one with extra olives because he remembered Tamara liked olives, and came inside. She was sitting on the couch in tiny athletic shorts and wearing a small grey singlet, she was on her phone to a friend of hers and had her feet up on the coffee table (something William repeatedly told her not to do). He gave her a look as he held the pizzas as if to say "take you're feet down", she rolled her eyes as she kept talking taking them off. He placed the pizzas on the dining table not saying anything. Tamara kept talking, "-yeah! I know! She's such a bitch! Oh hold on Sue - Hey! What did you get?"

William looked at her, "pizza, extra olives just as you like."

"ok."

She didn't say thanks or anything at all she grabbed some slices and took them back to the couch.

"anyway. Sorry. Yeah, total bitch! Don't know why they're together. Though there are plenty of people I don't know why they're together...." She hung that out in the air knowing William was listening, "anyway I gotta go. William just came home. Ok bye!"

It still annoyed William that she just referred to him by his first name, after everything he had done for her after her father had just up and left them. But he just was done fighting.

After eating, he went to his office and connected up to one of the Be-Mods, it was set to a basic setting of obedience. Essentially the user would just everything the other person said. In a moment of humour he thought, "maybe I should try it on Tamara!" But somehow that thought blossomed and he really thought about it. He was confident in its safety, and here was a moody disobedient bitch that could be the first to be trialled on. He looked at his phone, and saw a message from his wife saying she had gone out for drinks with her friends after their pilates session. Usually she stumbled home about 1am these nights. It all just clicked for William, Tamara was going to be the first human Be-Mod user!

He walked out holding one in his hand, the beauty of the Be-Mods was they were easy to apply and quick to respond. He walked up to her from behind, casually he said to Tamara, "Tamara I think you have something on your ear, let me have a look." Before she could say anything William had already held her head to the side and stuck the Be-Mod on her, the Be-Mod immediately pierced her head and connected her bain to it's modification system. A simple command of "obey". Initially she got up angrily, "what the fuck William! That's so creepy, wait until I tell my mom!"

Moment of truth, "be quite Tamara." A straight command, nothing else. The effects were immediate, she didn't say a word! She looked a little confused by it, her eyes were almost straining wanting to shout back at him but instead she stood there, waiting the next command.

"Go to the kitchen and get me a glass of water."

Tamara turned around and when she returned there was a glass of water in her hand, she held it out for him to take.

"Drink the water, all of it."

She placed the glass to her lips and proceeded to drink the entire glass without a second thought.

"Holy shit", William thought, "this is working better than I ever imagined!" He thought of something that had bugged him for a while every time her was upstairs.

"Your room is a mess, go tidy and clean it."

Yet again no come back, no resistance, she grabbed the vacuum cleaner from the storage cupboard and took it upstairs.

William cracked open and beer in celebration and put the TV on a program he liked to watch but Tamara would always bitch about, Game of Thrones. Apparently it wasn't sensitive to women's rights or some bullshit, "I mean it's set in a fucking fantasy world, equivalent to hundreds of years ago!"

But he sat back and watched it hearing the vacuum going upstairs. About an hour later she came back downstairs, she was sweaty and a bit dirty, she wasn't wearing a bra before so he could see her breasts clinging to her top.

"I have cleaned my room, would you like to see it."

"Yes I would, thank you Tamara."

This was going so much better than he thought, imagine the possibilities he thought!

He and Tamara came to her room, honestly it was unrecognisable. Where there were usually clothes on the floor and her "desk" a total mess of crap. now it looked closer to one of those show rooms you see at brand new houses. Not a speck of dust in sight!

"You've done well, go have a shower and get into your pyjama's. Wear those silky ones with the short shorts. Then come back downstairs."

She turned and walked out of the room, and walked into the bathroom. She was obeying his every word. This was also a test of durability, he had look said that the Be-Mods would work in water for up to 5 hours, but they hadn't been willing to test it. So here was a real world opportunity. If they didn't work the theory was it would gently direct the user to get out immediately before they would fall asleep. He hoped that today it would just work.

Sure enough 10 minutes later Tamara came out of the shower, she walked out of the shower damp only wearing her towel. At that moment he realised just how sexy she was, he had always known she was beautiful but her attitude always turned him off her. But seeing her so obedient, it actually turned him on! He realised he had a massive boner.

He let her get dressed in the pyjamas he told her to wear and made his way downstairs, 5min later she came down wearing the silk pj's, looking absolutely sexy as fuck. His cock was already hard but it now felt like it was bulging out of his pants. She stood there and said, "I'm showered and in my pyjamas". William responded, "good girl, come sit on the couch with me, snuggle up tightly to me."

Tamara did as she was told, William felt her warmth rubbing against his body as she cuddled him. William held her, "Tamara you're very sexy, you've given me a hard boner. Unzip my pants and rub my cock."

Tamara looked at him as she unzipped him and reached her hand inside his pants pulling out his cock. She rubbed it seductively. William could not believe what was happening, he could never have imagined it going like this!

"Oh yeah Tamara, you're a good girl now thanks to daddy. From now on when we are alone I want you to call me daddy."

"Yes, daddy."

"Mmmmmm, you're good at jerking cock. Have you jerked many other guys?"

"Four other guys daddy."

"Who are they? Tell me their names."

"Devon was my first. Cameron was second. I know them from school. My boyfriend Steve."

William nodded, he'd met all of them and knew she was dating Steve. "and the fourth?"

"Mr Boyd."

"Our neighbour?"

"Yes daddy, I stole from him and he caught me. He asked me what I would do to stop him reporting it, so I gave him and hand job, and then I sucked his cock."

"You're a very naughty girl Tamara."

"Yes daddy."

"Suck my cock naughty girl. Suck me like you sucked Mr Boyd."

Tamara lowered her head down into his lap and wrapped her lips around his 52 year old cock. She sucked him deeply, using her tongue to tease him.

"Finger yourself while you suck me, get yourself nice and wet for daddy."

Tamara reached a hand down and started fingering herself as she sucked William, she started moaning as her pussy got wet.

"Mmmmmm Tamara you are a good little cock sucker, look at daddy while you suck me."

Tamara lifted her eyes as she bobbed up and down on William, she looked so hot. Her Asian features bringing out the cuteness in her face, she seemed like she really enjoyed sucking William.

"Mmmmmm ffffuuuuck you're so good! Ok that's enough, sit on daddy's lap facing me. Slide your wet pussy onto daddy's hard cock."

"Yes daddy.”

She straddled William with her arms wrapped around the back of his neck, and using one hand she guided his cock into her pussy. Immediately William felt how wet she was, her pussy was still young enough he felt it gripping against him. Once he was in her he started thrusting up, he was so turned on he knew this was not going to take long.

"Ohhhhhh fffffuck!!! You're daddy's little fucktoy now, daddy's little whore!"

"Yes daddy! Yes daddy!!! I'm your whore, fuck me!"

He gripped her butt-cheeks hard as he slammed his cock inside her, Tamara closing her eyes as she felt her body giving into passion, and in unison they cried out in lust as both William and Tamara starting cumming hard!

Tamara screamed in pleasure, "ahhhhhhhhhhh ohhhhhhhhhhh!!!!!"

"Fuck yeah Tamara!!! Take my cum you disobedient little slut!!!!"

Each thrust extended Tamara's orgasm while it squirted more cum inside her. Finally though he went soft and they embraced in a cuddle.

"Tamara, are you on birth control?"

"Yes daddy."

"What are you using?"

"I'm on the pill."

"Good girl. If you get pregnant I want you to tell daddy. I will instruct you what to do."

"Yes daddy, am I a good girl now daddy?"

William was a little taken back by this, it was the first question she had asked. It was all important information for him to collect.

"Yes Tamara, thanks to daddy you're a good girl."

"Thank you daddy."

They stayed cuddling for a few minutes before William decided to end the night.

"Go have another shower, get back into your pyjamas and go to bed. When you wake up tomorrow you won't recall anything from tonight. If anyone asks you, you cleaned your room, watched some TV, and went to bed."

"Yes daddy."

Tamara got up from the couch and unexpectedly gave William a passionate kiss. Again, this was not an order of William's so it was information he would have to consider. Tamara went upstairs and showered before going to bed. She fell asleep very quickly.

William meanwhile cleaned the couch of any bodily fluid and put an air-freshener on. He waited up until his wife came home, as expected she stumbled in drunk. At 40 years old she was still hot and William was still horny from fucking Tamara, as she came in her gave her a passionate kiss and they stripped off their clothes getting intimate on the couch. Britney gave William a sloppy blow-job before he fucked her from behind on the couch where only hours earlier he'd fucked her daughter. The whole time he was thinking about how hot it was hearing Tamara call him "daddy". As they both came hard he had Tamara in his mind, he very nearly even cried her name out, but held it in and sent his cum into Britney.

Britney almost fell straight asleep after sex, William scooped her up and took her to the bedroom. She snored deeply while William contemplated one of the best nights of his life. Tomorrow there needed to be more tests, and Britney would be seeing a very different version of her daughter.

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Thanks for reading, I appreciate all feedback to help me improve my writing. Comment or message me with any thoughts you have.
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