Evolution Unlocked

His cock must be at least a foot long now and appropriately thick, no wonder he had been in her womb, he could only assume that the nanites felt it necessary to be injected into her womb, beyond her cervix. I guess it makes sense he thought.

His stomach rumbled and he realised he was fucking starving, but Rebecca was still out of it. Her face was a picture stuck in what could only be viewed as pure ecstasy. Her breathing was regular and even, but she was out of it.

Sam picked her up gently in his arms and carried her upstairs, laying her on the bed gently disengaging from her arms that had locked round him, before covering her with the duvet as she whimpered slightly.

He was soaked in sweat, his trousers were coated in pussy juice and although he might be starving, the shower was calling him sweetly. The hot water felt so good as it cascaded over his body warming the muscles that were still complaining a little about their treatment and a few minutes later Sam emerged from the shower feeling refreshed, but starving hungry. After checking on Rebecca, he got dressed and went downstairs to the kitchen, his hands almost working on autopilot as he grabbed food from the fridge and stuffed it into his mouth.

It wasn't till about half an hour later that he realised how much he had eaten in a short space of time and the gnawing feeling in his stomach has disappeared. There was no way he should have been able to eat that much, but somehow he had, clearly the upgrades to his digestive system playing their role already.

Once he had made some coffee and further snacks he opened up the nanite menu and was immediately confronted by a change, the first menu was now split into master unit and slave units. Dropping into the slave unit menu, there was only one option, currently called slave unit one. That wasn't right, so he immediately renamed it to Rebecca. He considered using 'Breeding Slut' and or princess, but decided to stick with her name.

Delving into her menu, he noted that the system told him the unit was currently asleep and gave co-ordinates and an elevation to her, that was interesting. But the only current option was 'diagnostics', which when he went into. He could see this was currently 45% complete and had an estimated time to completion of 1hr 25 mins.

He went into his own menu and was glad to see that his CV upgrades had just completed, probably due to the binge eating he had been doing, clearly a side effect of the Nanites suddenly growing his cock massively. A thought occurred to him and he dropped his trousers and looked at his balls. Shit, they were much larger than before at least the size of modest apples.

Doing them back up, he went into his own reproductive menu. He quickly discovered that his cock size was now at 75% of the maximum possible. Shit he didn't even want to think what 100% would be, fucking silly he thought. His maximum sperm volume was now 500 millilitres, 50% of maximum. His sperm motility was at 60% of max and his sperm count was 200m per millilitre, which was the normal max for a human male, but that was only 40% of the maximum, so his max sperm per ejaculation was now 1 trillion. Shit that's a lot he thought.

He could see through the menu's that the system had recorded the making of the slave unit as a high stress event, the size increases in genitalia had been required to make the slave unit, but also the system had noted very high stress levels within his muscular system, his endocrine system and also his neural system. Interestingly the system was providing recommendations to prevent that stress from occurring in the future. He read those interested and found that the first recommendation was endocrine capacity and efficiency, followed by skeletal upgrades, then improvements to his muscular system comprising, to improve muscle stamina, density and twitch response. The final recommendation was renal system upgrades to better remove toxic wastes from his system.

Reading through each recommendation, he could see why the skeletal upgrade was second, because of the muscular upgrades required, however when he looked at the option, his jaw hit the floor. The upgrade was to lace his bones with carbon fibre nanotubes, which would reduce bone weight by 50%, whilst not making the bones too hard and increasing all of their rigidity properties by at least 800% over standard, whilst also improving ligaments and their attachment strength by 1000% over standard. Shit, that would make his bones far stronger than titanium alloy.

Curiosity peaked, he looked at the muscle upgrades, what the hell could the system do that might require that high an increase in skeletal strength? But currently nothing was available that would require anywhere near that level of improvement. That suggested that maybe further upgrades would become available once the skeletal upgrades were complete. It would certainly make sense and part of his programming had been to not allow any upgrade that would compromise the hosts body, so that fit too.

Slave unit is awakening suddenly displayed in his view

That was unexpected, but useful, Sam grabbed a bottle of water and headed back upstairs. Opening the bedroom door, he could see Rebecca stirring, so he sat down gently on the bed next to her and stroked her hair away from her face. She opened her eyes and looked at him and he saw a little twinkle in them before she quietly said.

"Slave unit ready for programming master." In a semi monotone voice.

Sam felt the panic rising in him, the expression on his face a picture of horror and panic.

He saw the expression on Rebecca's face change as she leapt up and hugged him. "I was only joking Sam, I'm sorry, it was only a joke." She whispered in a panicked voice.

Sam felt the tension drain from him nearly instantly, the thought of her becoming something like that had been horrifying beyond imagination.

He pulled back and looked at her. "You are a very naughty girl." He said gently. "But please, don't ever scare me like that." He added seriously.

"I won't, I promise master, I love you so much. Please forgive me." She whispered covering him with kisses.

"You are forgiven my darling." He said gently holding her face in his hands and kissing her gently. "I love you too."

He felt the shiver run down her as he said those words, he didn't doubt them at all, he did love her, but her reaction gave him a warm fuzzy feeling inside and it felt so good. But then she shifted as though uncomfortable and rubbed gently on her belly and down to her groin. Her expression changing to one of discomfort.

"O.o, that's not good," she whispered as she shifted

"Sore?" he asked

"Yes,, I feel like I've been split in two, all the way up to my tummy," she whispered shifting uncomfortably.

"How about a shower, we can remove your plug to help and you can see why you feel that way."

Sam helped her up and she was definitely walking funny as she sort of hobbled to the bathroom. Sam stripped her off after starting the shower, then stripped himself off and joined her under the shower, He started to gently massage her starting at the neck and working down, working through the muscle groups on her back and moving down to her bottom slowly.

"Bend over and let's take this plug out for now." He said, gently pushing her forwards, before slowly easing the plus out of her bottom and placing it down.

"Aww, the does help a bit, but god, what did you do to my pussy and my insides feel battered, she groaned."

"Hmm, well we both got so turned on, I accepted the option to make you a slave unit, then the nanites did some things I wasn't expecting." He said gently as he gently rubbed her belly just above her pelvis.

"It seems that the nanites needed to be injected directly into your womb, so they did some rapid on the fly modifying of me, this." He said turning her round and pointing downwards to his now massive cock and balls.

"Holy fuck." Rebecca whispered as she gently touched and moved his cock, it starting to rapidly harden in her hand and she watched mesmerised, as it lengthened and thickened coming fully erect.

"This," he said moving her hand to his now huge helmet was all the way through your cervix and inside your womb. He said gently.

"God no wonder I feel like I've been split down the middle." She whispered still staring at the enormous cock in her hands. "My poor pussy is going to have to get used to this."

"It's ok." He said as he gave her a gentle hug. "The nanites diagnostics on you are nearly done, so we can see what's what shortly, I suspect they may have a cure for your discomfort." He said with a smile.

"It's strange to think they are inside me now," she said looking into his eyes. "I don't feel anything physically, but the thought that I'm now your slave unit." She shivered as her eyes sparkled. "I love you Sam, every time something new happens, it seems to make me want to be with you more. I can't explain it, it's like I was made to be yours and now I am, I feel complete somehow."

"I know Rebecca, I didn't intend this to happen this fast, but I don't regret it, I want you with me. Having you give yourself to me like this is beyond wonderful. But I think we need to get out of this shower before we start to prune and get some food into you, I suspect you're probably rather hungry?" he said with a smile.

As if on cue her stomach grumbled loudly. They finished up, dried off and dressed, before heading back to the kitchen. Rebecca noticed the pool of her juices on the floor and giggled.

"I think I might need to clear that up sir." Sam just laughed.

Just as she had finished clearing up the juices from the floor, Sam's interface beeped to confirm the diagnostics on Rebecca were complete. They grabbed some food for her and Sam guided her downstairs, so he could show her the interface on the PC.

He pulled up the diagnostic menu but couldn't help but notice her smile when she saw she was a slave unit to the master.

Subject: Human Female

Age: 46

Diagnostic issues detected:

• Mild trauma to sacral and lumbar vertebrae
• Mild macular degeneration (age related)
• Mild levels of internal body fat
• Normal age related general body degeneration
• Moderate joint damage to left knee and ankle
• Mild cervical and uterine trauma (caused by slaving).
• Mild neural hormonal imbalance

Would you like to correct these issues? Yes/No

Sam, thought yes and then an additional menu popped up.

Please set desired physiological age and apparent age

Sam looked at Rebecca "What age would you like to look like? You already look pretty young, so anything down to about 30 isn't going to make people ask too many questions?"

Rebecca looked at Sam, "Sir, I am yours, make me look whatever age you want." She said with a smile.

Sam set apparent age to 28 then set the physiological age to 21, before looking at Rebecca "Not quite peak fertility, but close." He whispered, gently stroking her face.

"It's really going to happen?" she whispered, "I'll be able to have your babies?" she looked at him and the tears were welling in her eyes.

"Yes my darling, but before I breed you, we need to find the perfect collar for you. I want you collared first."

The joy on her face, as the tears started to flow in rivers made Sam's heart sing. "Thank you sir, thank, you, thank you, thank you." She whispered as she hugged him, kissing him all over enthusiastically.

Sam, clicked on the accept option, which brought up another menu.

Warning, correcting these issues will take approximately 8 hours. It is recommended that the subject be asleep whilst the corrections occur to prevent discomfort. Do you wish to schedule this for the next time sleep is detected in the subject? Yes/No?

Sam selected yes again and a further menu popped up.

Efficiency recommendation: The body fat being removed during the diagnostic correction can be used to enhance the subject or be purged from the subjects system. Select option, enhance / purge.

Sam selected enhance and the next options came up.

Enhancements available from available body fat:

• Increase cervical and uterine compliance/elasticity to prevent further injury when slaves cervix and uterus are penetrated. (recommended).
• Vaginal enhancements - further options available
• Reproductive system upgrades - further options available
• Increase overall muscle mass up to 8%
• Increase overall muscle endurance up to 14%
• Breast upgrade options -- further options available.

Sam looked at Rebecca and ticked the cervical and uterine option without even considering it, she needed to be able to cope with his new monster cock and the thought of being able to fuck her that deep had his cock hardening already.

He scrolled into the Vaginal category and selected the increased elasticity option, setting that to improve by 20% which again should make her more comfortable.

The reproductive system section had a variety of different options although he found it interesting that there was an option to improve fertility overall, but there were also sub sections like propensity for twins, triplets etc, as well as elongating fertility windows, as well as uterine pliability and others. Interestingly there was also an option to lock her fertility to only allow her to be impregnated by a designated master unit.

He glanced at her when that option came up and she just looked at him and said completely calmly. "No man, but you, is ever going to be allowed inside me again, I will kill anyone else that tries to break that rule. I am yours."

Some of the options, didn't really make much sense to Sam, given that the Nanites could repair any damage that might occur, but he supposed it was better to prevent damage than repair it, so he selected both uterine elasticity and increased that up by 50% and also selected the pelvic options that increased the size of the birth canal through her pelvis and that also widened her hips slightly.

"I want giving birth to be a pleasurable experience for you." He said as he selected them. Rebecca just beamed a smile and her eyes sparkled at him.

He definitely didn't want her more muscular, but giving her additional endurance seemed like a good idea, so he went into that menu and found the maximum increase had reduced to 8%. He didn't see any need to upgrade her gorgeous tits or nipples at the moment, so ignored that and confirmed the options.

"Right, this will all happen overnight and will take approximately 8 hours once you go to sleep, how do you feel?"

"Excited, nervous, wondering how I will feel in the morning. Mostly though Sam, I'm looking forward to being able to take that huge cock deep into your pussy and feeling you fill your then fertile womb with your seed. I cannot tell you how much I want that."

"Well, I'm not sure what the system will do regarding your cycle, whether it will reset you to the start or keep you where you are in the cycle, so we need to keep an open mind, although I will admit to wanting to practice plundering your womb quite a lot before I breed you."

"I know Sam, I'm torn too, but either way is great, honestly."

"So what would you like to do, your last night of being physically 46?"

"Maybe a takeaway and some movies, before curling up in bed with my new master?"

"Sounds good my darling little slave. If you want to go and set about ordering something, I'll be up in a minute, I just need to set my own next upgrades. Sam pulled up the menu and selected the endocrine system upgrade, noting that it said he already had sufficient nutrients for it and that it would only take 30 minutes. He then looked at the skeletal options and selected the carbon nano upgrades. Ironically the nutrient requirements were far less than he expected, given that this upgraded the entire skeleton. He queued the skeletal upgrade and also the renal upgrade and made a note of the recommended foods he needed.

Sam made his way back upstairs, glancing at the clock he realised it was already just gone 6pm.

"What would you like for a takeaway Sam?" Rebecca asked when he walked into the living room.

"Well something like Pizza would be both good for my upgrades and also great so we can just veg out and not worry about washing up?"

"Domino's?" she asked with a smile

"Sounds good to me."

After looking at the options, he picked a large pizza plus potato wedges for himself, which would also provide a little over half what the skeletal upgraded required. Rebecca picked her own and placed the order using his credit card.

The Pizza arrived maybe half an hour later and they had already selected a couple of films, starting with Braveheart. After the Pizza was eaten, Rebecca snuggle up close to Sam, and nestled her head on his chest, relaxing in the warmth and safety of his arms. He didn't even realise he had been gently stroking her until she fidgeted slightly towards the end of the first film and her hand slipped down to rest on the slumbering beast in his trousers. It started to awaken at her gentle teasing and he kissed the top of her head.

"I have no idea how I'm going to fit that beast in my throat now sir, but I want to keep trying till I can." She said gently as her gaze wandered to his face.

"I suspect the nanites will be able to help Princess, once tonight is over, we can have a look at some of the options and maybe allow your beautiful body cope with me more easily. Speaking of which, one of the things I want you to think about after tomorrow, is any changes you might like the nanites to make to your body. I want you to think if there is anything you would like to change and we can discuss it ok?"

"Of course sir, but it's your body, so it should really be your choice."

"I know that Princess, but this is about what you want and or need. So if there is anything that has or does bother you, then I expect you to tell me ok?"

"Yes sir, I understand, but sir, can I make one request?"

"Of course, what is it?"

"Once you know what I think, if there is anything you want to change, do not ask me, just do it, it's your body and I want it to please you as much as it possibly can." She said earnestly.

"Ok, I will bear that in mind beautiful, whilst we are on this subject, I also want you to think about my body. What if anything would you want different if you can have it?"

"It's not really my place to say sir, but I can see you're serious and I love that you are being so considerate, so I will think sir. But I just want you to remember that I love it when you are in charge and make decisions."

Sam stroked her hair gently. "I understand Princess, but likewise in order to lead properly, I need other opinions and viewpoints, then I can assess them and see if they have merit. I base my decisions on the available information and I want all the available information so I can make the best decisions possible ok?"

"Every single time I think you can't make me feel more for you, you do, or say something that proves me wrong. How on earth did I live next door to you for a decade and never realise that my perfect man was so close? But because of you and your amazing invention, I don't even need to regret that now. It would be so easy for me to hate Jack now, but you've taken that possibility and now I just pity him."

She smirked suddenly, "Although I will admit, part of me is so looking forward to seeing him, after I'm rejuvenated, with your collar round my neck and a big pregnant belly full of your baby." She giggled.