Da Vinci's Universal Servant Reserve Project

Hipposagainstleopards (Twitter & AO3)

Desc.: It has been a long time since Da Vinci first set out on her mission of finding the best way to make new Servants and now, she has found perhaps the best candidate to test her theories on in Passionlip who frankly did not expect most of this to happen.

Leonardo da Vinci considered herself one of the finest Casters Chaldea had, not solely due to power, mana reserves, or even being the first to arrive but due to her constant drive to find new ways to help make the facility even better and her appreciation for beauty, what other Servant could claim to match her supreme appreciation for finding what made something truly great? That was what it meant to be a truly universal thinker but some saw her as some kind of weird pervert nowadays, well, the Caster couldn't help that she had been making good ground in figuring out how to make new Demi-Servants and Servants which resulted in a couple fascinating and quite pleasurable field tests, she had learned a lot about how to modify the reproductive system already. And of course, da Vinci had a few odd offspring that she still loved from her adventures but today was when she finally achieved what was perhaps the masterpiece of her Servant career, it was just a matter of waiting in her workshop for her willing assistant to arrive and help her in seeing if all of her hard work would finally pay off in one great success for her still experimental project, she just didn't know who to expect.

Most of the Masters' Servants didn't trust Da Vinci which was a shame, how much of a better bond could those familiars have with their mages if her work resulted in a success and yet they refused to see the light? Perhaps they would see their errors later but for right now, she had to deal with the more unsavory characters who she felt cared more about personal pleasure than efficiency and beauty for all. "Um, hello, Da Vinci?" "Oh my..." "I hope I'm not dissapointing to you..." If the Caster had some force guiding her down the right path, it clearly showed that her luck had been truly universal this day as she could hardly pick a better Servant to test her theories and new member on than this beautiful display of fertility, Passionlip was downright one of the most attractive Servants in Chaldea and that chest was...no, that was not her goal this time but perhaps she could let her children help out.

"No, you are truly a universal beauty! Such plump breasts and wide hips! To think that one would think such a body is unattractive merely for your weapons!" "Ah, I'm truly happy to hear that...Mother sent me to help you with some experiment, I hope it won't be painful..." "I hope it won't be, my dear, but I must say these truly are something that could suck a partner right in without even their unique property of a disposal unit, that is cruel to deny your daughter an integral part of her beauty!" The universal genius couldn't help but start groping the Alter Ego's massive breasts, she was careful not to go too deep lest she wind up wasting her potency on what would admittedly probably be the best titfuck she could ever have or literally be sucked into the garbage, still they were incredibly soft and warm while her partner looked away from her with a shy blush.

"I'm sure Mother had her reasons for making me like this." "Indeed...but I do not want to surprise you with what my intentions are, would you happen to have a cock and balls already?" "What?!" Da Vinci was perhaps a bit too forward with Passionlip, she had just gotten her to look into her blue eyes with those deep purple irises while kneading her plump rack between her delicate fingers, but her partner was a quick learner with her outfit suddenly changing to one that revealed so much more skin, thin little straps covering her now erect tits poking through and her massive claws trying to pull down her pink skirt and black leggings. "You just get better and better, Passionlip! I could hardly have asked for a better test subject!" "You're the first person who's actually asked to see that embarassing thing..." "Oh no, I think it does much for a fine young lady's appearance..." The Caster simply kept smiling gently at the Alter Ego as she then pulled down the other Servant's legwear, the brunette practically beaming as she saw the massive member popping up to greet her and her own little modification burst out of her red skirt to smack against the side and measure against her purple-haired partner's futahood.

"Ah...you have one too but why is it a horse..." "Well, it's a personal modification but you are still bigger than me to start with, that's very good to see. Such a sad pair however, is that another sick joke from your Mother to give such a universally potent shaft such small babymakers to pull from?" "Um, I'm glad to be complimented like this but what are we going to do that you needed to see this?" The universal genius had spent so much time getting the right measurements for the Amazon centaur horse cock she had transformed her own meat into and even that potent display of virility was a good couple inches shorter than the AI of Love, it made her even more eager to begin but first she had to get something out of the way as she yanked her brown and blue dress' top open to let her own ample breasts flop out with her stiff nipples poking out that she rubbed against her partner as she moaned.

"Well, my dear Passionlip, I've been working on a new way to make Servants. Summoning is such a pain and making them is usually difficult but I think I found a way to fix that..." "Hehe, I'm glad to hear that but why are you lining up to my tip with your own? That isn't how you make babies is it?" "Oh trust me, I know from personal experience it works several times and why did you immediately jump to the conclusion that we're reproducing?" To be fair, da Vinci's horse balls were far more large, reaching below her knees while Passionlip's human pair just filled up the space between her legs with a cute pink panty on them, but as the brunette lined up to the purple haired girl and held onto her shoulders, she suddenly thrust her hips forward into the sizable urethra in front of her,the centaur meat surprisingly easily slid into the member across from her with a louder moan from her partner and a pleased chuckle from the inventor.

"Ah! It's just that it makes sense that would be what you were planning with both our reproductive organs out but wouldn't this be much easier to do with my vagina instead?!" "Oh no, that's not as pleasant! I hope you don't mind me letting my own daughters out to have some fun with you, they really like playing with beautiful girls!" "Of course not! Wait...why are they centaurs?!" Of course the Alter Ego would be confused, it's not like the Caster looked like she was a mother especially not from a testicular impregnation but that was an exceptionally fun Singularity, those Amazon centaurs just wouldn't leave her urethra unused until she was carrying their offspring and delivered them, these two blondes with red bras now being undone showed off their chests and cocks to match their mother as she let them out of containment with a well-rehearsed spell.

"Well, I'd be greedy to just hog this wonderful body to myself so I thought I'd share it. That's fine, isn't it?" "Ah yes! I don't mind! I never thought so many people would..." "It's to be expected when your body is so beautiful, trust me, Da Vinci would know!" The universal genius did another quick gesture to put up a barrier over the AI of Love's Breast Valley as one of her centaur daughters put her already twitching futahood between those massive breasts, the brunette knew they had a short fuse and the purple-haired girl tried to put her lips around the massive tip, while the other laid her front legs on those large claws and found the equally spacious virgin pussy of her partner to push inside as their mother enjoyed being in the middle of a tight warm dick's embrace for a moment.

"I managed to fit my entire member inside with one thrust...this is truly starting off perfectly!" Da Vinci was practically in heaven as she pumped her potent horse member into Passionlip's lengthy girthy cock, her urethra felt really nice around the brunette, honestly probably better than her vagina and mouth with the suction but she was happy to see her daughters already panting as they thrusted into her well-endowed partner with full intent to breed her, she certainly taught them well. The Alter Ego did her best to keep suckling the centaur meat popping through her massive breasts at a decent pace and leaking precum already from the soft tits wrapped around the Amazon's base, her heavy balls smacking eagerly against the huge rack that engulfed most of her length, and her sister kept moving her wide hips forward to push all the way inside the surprisingly deep pussy that clung to her with wet vaginal walls, the feeling made her reproductive organ twitch sporadically in the Servant's tunnel. The Caster grinned as she saw her partner's lewd body jiggling all over from the breeding attempts of her daughters and their mother before looking down to see her horse dick buried to the hilt in the AI of Love's stuffed urethra before pulling out to a quarter of the way and then slamming back into her futahood with increasingly intense breaths and movements, maybe it was a bit much to involve her offspring at the same time as the first round...

"A worthy body for the Alter Ego of Love if I do say so myself, excellent grip for the urethra on the penetrating member, comfortable size for thrusting into, and plenty of other options but will your balls take to my seed?" Passionlip looked back at da Vinci with an even brighter blush and muffled gasp as she enjoyed what the brunette was planning on doing, the horse cock in her oversized member was pounding back and forth in her with the full intention of breeding her pair and that filled her with even more vigor as the purple-haired Servant began thrusting her wide hips forward to help. "Oh dear, you've been starved of affection, haven't you? Don't worry, Passionlip, we've only just begun with the experiment..."

The Caster's wide smile grew as she took in how truly perfect the Alter Ego was, her horse meat was being yanked back and forth into the intense, loving grip of the purple-haired Servant's warm penile walls and this was only a third of the way in her at best yet it felt like the brunette had plenty of room to pump her own hips into the long shaft without being uncomfortable. "Hah, feels so good, keep holding onto my meat..." "Of course, it's always important to keep mind of weak spots in love!" The universal genius had briefly moved her hands to steady the massive futahood in front of her but seeing how the AI of Love began bucking her pelvis forward with greater intensity at that, why would the brunette stop making it easier for her horse dick to bury itself in her willing test subject? It certainly felt a bit tighter around her when she did that anyways.

Da Vinci's urethral docking had the added effect of making Passionlip get far more passionate with her daughters, the first Amazon centaur heaving already as the purple-haired girl's massive rack squeezed her horse member tightly between them and the Servant frantically kissing and licking the tip to get all of the love from her many partners as possible, the blonde began groping her huge tits and holding her head down in her lust. "Oh, Juno, don't be so rough with Passionlip, I don't want to break her." The centaur nodded in response and eased her grip as her powerful legs kept pumping her potent meat in between the ample fuck pillows of the Alter Ego trying to milk her and closer to her attentive lips and tongue, the Caster took her time with truly enjoying the Servant shaft she placed her own girth into and bit her lip as it began to make her intermittently twitch, the brunette knew her partner's body wanted her seed with how much those perfect penile walls refused to let her go. The AI of Love's chest was constantly jiggling from the movements of the mother and daughters pumping into her orifices, adding to the immense pleasure of the already plump breasts wrapped around the first Amazon's horse cock that were almost keeping her locked in place as the purple-haired Servant sucked on the swollen, precum leaking tip.

The other Amazon centaur was certainly thankful that a side effect of da Vinci's cock fucking experiment made Passionlip's movements away from her mother push her tight pussy onto her own horse member, making her only have to thrust into the Servant's warm vaginal walls with loud slams, clearly the purple-haired girl enjoyed being claimed quite roughly. "Well, Gaia, doesn't your mother give you nice treats every once in a while?" The Caster was pleased to see her daughter smile in response, the two almost working together with their pumps into the respective clenching holes of the Alter Ego's urethra and vagina that made the purple-haired Servant push forward to bury her mother's horse shaft in her own or leave only a third of the Amazon's meat uncovered by the dripping tunnel and pressing against her womb. The centaur enjoyed being able to stuff the AI of Love's cunt with her horse dick and grinded up against the uterus that she wanted to fill with her swimmers, her only concern was lasting long enough to match her universal genius of a mother with this fertile hole latched onto her and almost reluctant to let go without her offspring deposited in the Servant.

"It would appear your loving beauty has finally overwhelmed me, Passionlip, and my daughters don't seem to be doing much better!" Passionlip looked at da Vinci with her purple eyes widening in anticipation as she practically felt each pair of potent horse balls from the Amazon centaurs and their mother begin to pulse against her tip, breasts, and pussy as they clung to her partners' groins, the brunette speeding up in her final thrusts that made her own ample rack jiggle as she pushed her horse member deeper into her eager cock. The Alter Ego kept dutifully attending the Amazon making short deliberate pumps into her fuck pillows, making sure her lips embraced every part of the lengthy girth she could reach even as her sister's futahood kept sending waves of pleasure through the Servant as her womb was pushed into and her vaginal walls stretched around it with an equally loving embrace.

"Are you sure you're fine with taking all of this seed at once?" "Yes! Give it all to me!" The AI of Love's lust was evident in her passionate grips and thrusts which made the brunette Caster chuckle happily as she rapidly slammed into the purple-haired Servant's stretched urethra before stopping, her centaur daughter taking the opportunity to push her horse dick completely in the Servant's cunt and entering her womb which made her have to focus her approaching orgasm on squeezing the first Amazon's shaft between her tits and sucking on the rapidly twitching tip.

"Time to see if all that research paid off!" Da Vinci was overjoyed to be able to pump her virile seed down Passionlip's beautiful member, the remaining penile walls widening to let her flow pump into the prostate and down the purple-haired Servant's widened vas deferens, making them bulge out between her member as the baby batter went through her tubing and got into her testes with surprising ease, making them slowly swell downwards and onto her legs. "That's promising..." The Amazon centaur in her pussy emptied a sizable amount of her fertile swimmers into the womb she was lodged in, managing to send her future offspring through the fallopian tubes and straight into the Alter Ego's ovaries, while her sister kept spurting frantically into the purple-haired Servant's mouth and over her massive breasts, even absorbing it didn't help much with the overwhelming pleasure and she was forced to let her plump rack swallow the stream. "Yes, it-well, this is inconvenient." The brunette Caster was greatly satisfied that the AI of Love's balls had now grown so heavy in her sack that they reached her knees to rival her own family jewels and that her centaur daughters seemed to be pleased but the purple-haired Servant was completely dazed from the intense affection she had just received, no matter, just another small spell for clearing her head should fix that.

"OH?! Da Vinci-chan, is it supposed to feel this full and warm down there?!" "Yes, Passionlip, I can happily tell you that you are the first impregnated Servant of Chaldea's new Reserve Program...well, at least in the incredibly effective but unpredictable testicular pregnancy but it would appear Gaia might have made your womb carry more than usual as well!" "Thanks, I'm really glad to receive such an honor..." To be fair to Passionlip, so much penetrating definitely must have worn her out a bit even with the extra mana she received and da Vinci could understand that with her impregnated sack swaying a bit as it poked out between her legs and swollen veins along it pumped blood to support her new wombs' offspring, she could tell they were forming nicely in both of her reproductive systems. "Now, Juno, Gaia, go eat lunch while your mother changes into her other form. Passionlip, just stay there." "Alright, will everyone else truly like these heavy orbs? If only da Vinci likes them, it's fine I suppose..."

The Alter Ego blushed as she looked down at her knocked-up family jewels, she could feel her fertile sperm cells merging with the Caster's virile swimmers, getting their heads penetrated, and the nuclei being divided with a similar process happening in her ovaries with the centaur seed and her eggs, she didn't even notice the Amazons had been sent back to their holding area and the brunette had left her. "I'm back, my wonderful beauty!" "Oh, that's ni-why are you so small now and is that another animal member?!" "It's more of a pain to change cocks out so I just had both my forms modified beforehand and this particular example was taken from those ugly dog-like things without eyes, frankly I don't even recall the name but I hope you find me more attractive." The poor AI of Love could hardly stop sputtering as the Lily began approaching her with a somehow thicker canine cock, the brunette leaning in to tenderly kiss her on the lips for several moments to calm her down, the purple-haired Servant relaxed as she felt her partner's nuclei pairings end up with healthy combinations and tried to push her gaping urethra against the new red futahood resting against her lengthy shaft.

"I've never done anything like this before...Ah!" "Oh...to be expected of a perfect body, your urethra can fit this new member just as easily!" "Ha, how can you be so calm when you're in that form and making me feel another one of your cocks in me?" Passionlip had hardly even noticed Da Vinci's outfit was now an almost completely white dress with blue and gold accents that had her skirt pushed up and the top pulled open, partially because of the increasingly lewd situation of the much smaller universal genius spreading her urethra open with a thrust of her new canine member and giggling sweetly as the purple-haired Servant cried out in surprise, it was definitely a tighter fit in her cock than the last one. "I hope you don't mind being knotted, Passionlip!" "Wait, I don't think it'll-OH?!"

"See, it feels good right..." The Rider saw the poor Alter Ego panting again already and her massive rack heaving as she shoved her dog meat completely in her partner's shaft, the purple-haired Servant attempting to cover her face with her claws as the knot widened her cockpussy open even more and left the brunette in the middle of her still sensitive penile walls. "Now, it's a shame to hide that face." "But...alright, look all you want but be more gentle..." The genius Lily began to move with surprisingly slow but powerful thrusts that made the AI of Love feel lightheaded once more, she flashed the brunette a nervous smile which was returned by a confident grin as she held the purple-haired Servant's futahood and pressed down on the soft spots where her dick was also moving inside before her massive breasts pushed forward.

Da Vinci took the invitation and started sucking on one of Passionlip's giant tits before moving on to the other, leaving the purple-haired Servant quivering and her purple irises looking down at her partner with affection as her hands moved behind the brunette and pushed her canine cock inside her stuffed urethra, starting to enjoy the feeling of her member being used immensely. "Lactating already? Well, I might have been a little too thorough with impregnating you!" "No, it was fun..." The Alter Ego was starting to like this smaller body and the Rider's unique choices for reproductive organs a bit more as her ample sack rested on her tip, the brunette still being as delicate as possible with her even as she moaned and spurt milk into her mouth, she wondered if the feeling of so many things settling in along her septa's walls and bottom along with her medulla and womb feeling heavier was how it felt to become a mother. The genius Lily put a hand on the AI of Love's impregnated womb sacks and suddenly a screen popped up to the right of her vision, the purple-haired Servant instantly turning bright red as she saw the statistics for how her urethra was handling a canine dick which was perfectly fine, how many offspring were in her futahood's engorged babymakers, and how many sperm cells she had left along with other lewd statistics.

"That can't be right..." "Oh no, it is. To be expected of a Servant with so many quality parts, your sack is replenishing at a rate usually only divine Heroic Spirits can muster which means you have a lot more swimmers to be claimed! I won't make you too heavy..." "My girls are going to outgrow my chest with you, Da Vinci-chan..." Da Vinci pumped her surprisingly wide hips into Passionlip with a bit more urgency and let her mouth open so her own heavy breaths could come out while the purple-haired Servant's massive rack and heavy balls jiggled, the brunette deciding she needed to keep this partner close by with how wonderful her urethra felt clinging to her and almost sucking her canine member off as she was knotted in her cock.

The Rider felt substantially more sensitive in this form, perhaps due to her relative lack of time in it and her dog meat was covered in waves of pleasure from the Alter Ego's widened penile walls that still kept trying to fit her reproductive organ completely, the purple-haired Servant's shaft had a visible bulge in it from the outside that showed where her knot rested slightly below the tip. "Look me in the eyes please..." "Of course but why?" "Ah, it's just a personal preference!" The genius Lily felt her passion to completely claim this perfect body rise when the AI of Love began looking into her blue eyes, pumping her animal futahood faster into the purple-haired Servant's cock and even pressing her length upwards so her partner could see her gaping cockpussy right near her milky breasts and she started grinning as well with her claws moving closer.

"Oh, you like this after all?" "Mmm, it's more because of you but I don't want to let you go until all you've finished inside me again!" "Ah, what an affectionate partner you are, Passionlip! Don't worry, I have lots of love for you!" Passionlip kissed da Vinci for a couple more moments as she felt the knot pushing her penile walls apart even more, the purple-haired Servant becoming increasingly excited as she felt the brunette's balls pulsing against her tip with the canine cock continuing to slam into her member with the urgent need to release in her new womb sacks, she might have found her new favorite form of love.

The Alter Ego broke the kiss and cried out as the Rider began to rub her lengthy shaft and knocked-up pair with excitement, the brunette laughing happily as the purple-haired Servant began trembling and tightening up around her dog meat with her own wide hips thrusting forward vigorously, almost as if she were trying to impregnate herself or at least ensuring even more offspring were conceived in her. "Ah, I seem to have less stamina in this form as well..." "You've been going for several minutes!" "I did better before!" The AI of Love really didn't mind the genius Lily starting to throb sporadically in her, really this was a bit embarassing how good it felt to have an animal dick in her futahood and it was hardly like she could take much more of the brunette's passionate pumps into her urethra, her small body still making the purple-haired Servant's considerable assets bounce around with her tits continuing to lactate and her babymakers still beginning gestation properly.

"Cumming, Passionlip!" "Ahn! Is this even more than before?!" Da Vinci's knot locked her canine cock a bit further than halfway in Passionlip's lengthy member as it swelled to the maximum size it could reach, the brunette's potent seed spurting out her own tip and easily moving past the purple-haired Servant's loosened penile walls to start flowing directly down her reproductive tubing that didn't even offer any resistance this time. "Oh...I hope Mother knew this would happen..." "It doesn't matter what she thinks, you'll be contributing far more to Chaldea than her..." The Rider wasn't lying, BB had done so much more to hinder their mission than help it, but thankfully this Alter Ego was quite the help as her handy analytics helped her see the successful impregnations rising before her blue eyes looked down at the results of her two rounds of urethral docking, the purple-haired Servant's balls were now about to match her rack in size and possibly be even bigger with their next wave of steady expansion.

"All things considered, a perfect first test run with a universally beautiful subject!" "Ah, I'm happy to help..." "As you can see, you'll be carrying quite the substantial amount of new Servants and I'd like to keep you around for later tests. So, want to be my assistant?" The AI of Love gently giggled and smiled while the genius Lily rested her head on her breasts, the purple-haired Servant gladly accepting the feeling of her testicles beginning to cover up her legs and the warmth that came with her sperm being used as fertile improvised eggs by the brunette's virile swimmers, her vas deferens remained visible next to her futahood as the canine dick popped out and it felt like they almost wanted more.

"Ah, yes! That sounds nice..." "Glad to hear that and it looks like your cute panty survived! Wow, that's some excellent taste in fabric!" "Well, it was part of a set to keep my chest in control but Mother said people liked me better without a bra..." Da Vinci groped Passionlip's massive chest one last time and clung to her body with her legs as she moved in for another passionate kiss, the purple-haired Servant holding her small body in between her breasts while the brunette's member got slightly stiff once more even as her offspring began to find suitable places for growing again in her partner's impressive babymakers. "Probably the only good decision she ever had, anyways, I promised Juno and Gaia they'd get to breed you after I was done!" "W-wait, what?!" "Be nice and have fun!"

The Rider walked away with a slight bounce as she gestured once more and the two Amazon centaurs from before began to rest their front legs on the Alter Ego's claws before pushing their horse members into her previously stretched urethra and pussy at the same time, the purple-haired Servant moaning in surprised pleasure as her testicles and ovaries were about to be used even more. "She probably can't get bigger but it doesn't hurt to try and maybe I'll figure out if she can still impregnate others...truly a beautiful example of a Servant and a nice place to start with my list. Now, let's see who seems like a good place to start next in my notebook..." The genius Lily left her daughters with her new assistant in her personal workshop as she pulled out a somewhat heavy but ornate journal, not even bothering to cover up as she could tell if a candidate peaked her interest better that way and began eagerly writing down her findings before going to her previous task of looking through all the current Chaldea Masters and Servants she had taken note of.

The trio of girls.

"Well, that clearly isn't happening immediately, I need to warm them up more to the conclusive results of my new program before trying anything..."

The Dragon Witch.

"Interesting, that could work quite well but then again, I could be roasted alive. Mmm, it's just a matter of getting past that coarse shell and to the soft insides..."

The poisonous Hassan.

"Oh, now this one is going to be fun to try, I should be able to make sure the poison isn't lethal but the question is, will the testicles be completely made viable only for her young afterwards?"

The King of Knights.

"Of course! This is definitely one that I can work with, ah, I personally prefer the Lion King and that Caster but I have such a wide selection..."

Needless to say, Leonardo da Vinci had a lot of work ahead of her and there were so many potential Servants to add to her program, yes, Chaldea would soon have entire legions of Servants to protect humanity and make her own dream a reality, the sounds of Passionlip being mated with in the other room driving the brunette into a frenzy of crafting a potential timeline and it would be a truly universal project...

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Pub: 07 Feb 2022 02:30 UTC
Views: 739