[Sex Toys, Corruption, Inanimate TF, Lactation]

"So why exactly do you need me here? You're an inventor, a marvel of Human ingenuity. And yet you need a Goddess of Love to help you. I don't know if you've noticed, but that seems more backwards than the kinds of love that I have to watch over."

"Now now, Kama. There's a lot of insight to be gained from having you here. Besides, Master requested that I keep a close eye on you. Especially since your main body is almost as small as mine."

"That's not a good thing for either of us, you realize."

Kama was... bewildered, more so than anything. She had been called upon by Chaldea's brightest mind, the one belonging to a certain Leonardo Da Vinci. And while she was not exactly pleased with seeing her smaller body, given the fact that her own body was just as young at the moment, she was more concerned about why she needed her in the first place.

"Why do you choose to don that body anyway?" Kama muttered as she took a seat on one of the empty tables nearby, letting her hands rest against her knee. "Don't you feel shame from doing so? What about the lack of respect from your peers? I don't see you taking advantage of that form in the same way I have." She continued, before scowling. The kind of people that were into this body... Far, far too obsessive. The lot of them.

Da Vinci chuckled as she put a hand on her chest. "Merely a test run. I want to make sure that this body functions the best it can. That way, I can use it as a backup in case something goes wrong. Of course, if things go way out of control, I'll have to only transfer my memories to this body and leave it to develop an ego of its own. But hopefully, things shouldn't get to that point." She explained, before turning towards her many tools. "Now then, as for why I brought you here... It's rather simple actually."

A light shone down from the ceiling, right onto a very large looking heart. Or at least, an item shaped like a heart. It wasn't exactly easy to tell what it was supposed to be, since there was no interface and no other sign of obvious usage.

"...I know I represent love, but this is a bit too high concept for me." Kama dryly remarked, as she drew a heart in the air. "Unless you're trying to say that you're trying to invent a way to inflict love. In which case, try and remember. Love isn't that simple. You can't just take a machine and fill somebody with love."

"Why not?" Da Vinci said, far too smug with her response. "If the Greek deities could inflict love upon mortals using their powers, then I don't suppose there should be anything preventing me from crafting a machine that could inflict the same sort of phenomenon. Failing that, at least I could try and replicate the effects of a love potion and have that serve as its basis."

Kama narrowed her eyes a bit more. The girl was making a mockery of her and the other divinities. Typical. And yet, at the same time... If it was possible to mechanize love like that, spread it far and wide using a simple machine... then perhaps there were quite a few uses she'd have in mind.

"Hmmm... Well, if it's love you're trying to fill people with, then I suggest you look at the root of why people fall in love." Kama said, a devious scheme cooking up in her head. In this timeline, she hadn't yet tried to achieve her true power as a Beast. But that didn't mean she couldn't accelerate the time table a little and have a bit of fun in the process. Turning Chaldea into a den of sin to reach her max potential? Through a misguided inventor's machinations? Heh. What a fun way to pass the time that'd be.

"Oh, affection and attraction?" Da Vinci chimed, as she turned towards a blackboard where she had already written up a thorough overview and theorem of how human relationships were formed, a bright smile on her face. "Don't you worry. I've already tried my hand at figuring it all out. It's surprisingly complex, considering all the values that have to be considered. Did you realize that the time of year that two people meet has an effect on how their relationship develops?"

Kama ignored the obvious statements. She was the Goddess of Love in her neck of the woods. Of course she knew. "No, no. That's very important as well, but you must remember. There's something instinctual that lurks underneath that. Something that even you should feel. Even in that form." She said, as she climbed down from the table, stepping closer and closer to Da Vinci. Each step is emphasized by an aura of love pouring out from her body.

"Something... instinctual..?" Da Vinci replied, her mind growing foggier the more she stared at Kama. Goodness, she should... She was doing something, and she should try and stop it. But her body was getting really sluggish just looking at her. Maybe she should just keep watching. Yeah... Yeah that sounded like a totally fine plan...

Once Kama had gotten close enough to Da Vinci that the tips of their noses could meet, the young Goddess pushed her lips up against the equally young inventor. And she snuck a hand down below as well, gently caressing that private spot that was meant to be so pure and protected. All while letting some of her love seem inside in the process.

It didn't take long for Da Vinci to feel a rush of energy pour into her. All while she shook and shivered all over. She... She didn't understand what this was, but she did understand the heat going through her. She was getting horribly aroused. And the more she looked at Kama, the more that arousal was growing. Haaah... She needed.... She needed to deal with it...

"That." Kama said, licking her lips as she pulled back. "Is the root of any relationship. Lust for your partner. Lust for your other half. Take that to heart, Da Vinci. And maybe then, you can make your machine work just as you want it to." She chimed, slowly stepping further back. "However... I think there's a much better use for your skills. Something that would be able to bring out the lust in others, without necessitating something this silly. Something much simpler, yet it would be improved tenfold by your professional touch..."

Da Vinci could feel the lust pouring through her. She could easily tell that she was being manipulated. But at the same time, she couldn't resist it. There's no way that she could resist the pure lust that came from a Goddess of Love. So she simply and eagerly nodded, gasping and panting in response.

Kama smirked. Oh, things were going to get a lot more fun from this point forward...

---

"So, how's this supposed to make us stronger, exactly?"

"Indeed! I do not see how this is meant to increase our strength!"

"Now now. Drake, Nero, I know you're both impatient. But you shouldn't worry too much. Just let me handle it. And everything will make sense in due time."

Da Vinci, having returned to her original body, looked a little different compared to before. Maybe it was because she had ditched the usual dress for a sling bikini with hearts covering her most important areas. Maybe it was the heart printed onto her thigh, her breast, her cheek and right above her pussy. Or maybe it was simply the fact that she was a little too eager compared to her normal self. Either way, most didn't really treat her new self that differently. Just treating it as another eccentric phase. Just like the younger self that she had stashed away at this point, saving it for special personal encounters with her dear Kama.

As for her current guests and unwitting test subjects, she had called upon two veterans. Rider class Francis Drake and Saber class Nero Claudius. Why them, in particular? Well, the suction cups that were attached to their breasts would probably explain everything. Not that she was going to actually spell it out for the two. That would go against everything that she had learned from Kama.

"Gotta say, this makes me feel more like a cow than anything else." Drake said as she put her hands on her breasts. Especially since those suction cups looked a lot more ravenous than the kind that were attached to cows. Which made a slight shiver run down her spine. "You sure this isn't some weird thing that Master made you create, Da Vinci? She's a real piece of work, so I wouldn't be surprised if this was her doing."

"Cows... Master... Ah, I see now, I see, umu!" Nero grinned as the gears up above started to really grind and turn. She totally understood. "You'll be using this device to pump us full of Mana, not unlike if we were being pumped full of a cow's milk and we used the nutrients to improve our bodies. Yes?"

So close. Yet so far. Despite Nero's rather eccentric tastes and unorthodox way of thinking, she had a habit of figuring out what was in play with just a little nudge. And here, Da Vinci barely had to do anything before she understood. Shame she got it wrong, because that would've made the look of shock on her face all the more delicious when it appeared.

"You're so very close, Nero. As a reward, how about we start with you? Don't worry. This won't hurt. In fact, it'll be so good that you won't have to worry about feeling anything ever again. Lucky you!" Da Vinci giggled, as she pressed the heart-shaped button on her remote, trembling as subjecting other girls to something like this was far too delightful...

"Eh-" Nero didn't get to say much more before she was assaulted by such an intense suction. It felt like her tits were being vacuumed, her nipples stretching out. Growing into definite teats that were trying to be forced open. Not only did it feel like she was being stretched out, not only did it feel like she was being vacuumed...

But it also felt like several tongues were licking away at her nipple. As well as a second mouth sucking on her nipple. Sucking and emphasizing it, until it started to throb and redden with need. She needed... She needed to... She needed to cum and get milked...!

And within a few moments of the suction starting, Nero was forced to cry out in pure delight as she came. So much juice poured onto the ground below, while milk began to pour from her nipples. So much milk being pumped out from her nipples. So, so much milk.

Drake watched as Nero practically got turned into a cow, all of that delicious looking milk leaking from her nipples as it was all being sucked up into the machine that was pumping it out of her. And she... She was leaking a little herself as she watched it. Not that she was going to admit that. Why in the world would she admit something like that? She just... She just couldn't stop staring. That's all.

"She's... She's like a cow..." Frankly, Nero was less like a cow and just outright a cow at this point. Because it wasn't just milk that was being sucked out of her tits, as Drake would soon come to find. No, it also contained a solid dose of her personality. Which was why the milk started to take on a pink tint, as she began to drool more and more.

Then it was her turn. She could hear Da Vinci clicking the other button, but by that point it was already too late. Any chance of her trying to resist had already come and gone, as she was forced to cry out intensely as... as...

W-Why was she... Why was she crying out again..? Right... Because she was cumming... Because she was squirting a lot... But what else was she doing... Uh.... She was being milked, yeah..? Yeah, that was right... And... Was anything else happening..? She wasn't sure... Maybe she should just... Stand there...

Drake could not even come close to resisting the way her mind was being milked. Her milk turned pink even quicker than Nero's had, as she just stood there. Eyes dimmed due to a lack of proper thinking up above, and a gushing pussy that just kept on letting out more and more juice as her body reached thresholds where it couldn't take any more pleasure.

"Mmmphh... Lust... Luuuuust..." Da Vinci gasped as she played with herself. Sticking the end of her remote up her pussy, using the vibrations that came from mashing the buttons to intensify the milking to get even closer to a climax of her own.

This was one facet of lust that she had pursued. The kind of lust that left one completely mindless. The kind of lust that made you lose yourself in your duty. It was a lust that wasn't exclusive to sex, but one that definitely was easy to trigger through intense stimuli like this. Just as Kama had told her...

While these cows were definitely delightful... She wanted more. Moooore... Muuuch, much more...

---

"W-What is the meaning of this, Da Vinci!? What have you done?!"

"F-Father... D-Damnit, I don't want to be part of this either! M-Mother, this is your doing, isn't it!?"

"N-Nonsense. This is... Hhh... This has nothing to do with me... You're betraying our Master by doing this, Da Vinci..!"

Da Vinci giggled as she watched a lovely family endure another kind of lust. One that she had forced them through, thanks to the finished version of her project. Instead of inflicting love, it would drive the ones subjected to its waves wild with lust for a few seconds. It was why she had managed to convince them all to get up on their respective poles...

The three that served as her current victims were all British. Lancer class Artoria Pendragon, Saber class Mordred Pendragon, and Berserker class Morgan. Well, it would be a misnomer to call the last one properly British, considering her existence didn't have ties to this timeline, but it was close enough. They were all family, which was why she wanted them to be stuck in lust together.

As for the experiment that they were being forced through... It was a rather simple one, all things considered. They were each pumping up and down on a different color coded dildo. One that had been sculpted in just the right way to ensure that they each got a taste of each other.

The cock that Artoria was bouncing on was shaped after Mordred's cock. A 'Son' breeding 'his Father'. At least, that was the intent. Considering the circumstances of Mordred's birth, this hardly served as the strangest thing that had happened to their relationship. Especially since Artoria was forced to pump her hips up and down with even greater intensity than normal, panting and gasping as she bounced up and down.

Mordred was in the same camp. She couldn't stop herself from bouncing up and down. Squatting up and down as a massive cock speared its way into her hole. This cock was shaped to match Morgan's specifications. While 'Father' was being bred by 'Son, Mother bred her 'Son' in turn. It was a daisy chain, and that might've been the reason why Mordred was so intense. Something about her complexes, and how much she wanted approval from either parent.

Finally, there was Morgan. While she had previously bounced on a cock not unlike the one currently stuffed into her pussy, this one was specifically shaped like this version of her Sister. Which meant that it was a lot thicker, since her sister had matured into a proper beauty. And with that kind of beauty, an equally intense cock naturally followed. And while it didn't move, she was forced to take it all in. Which not only reminded her of the experience of being bred to conceive Mordred... But filled her with all sorts of conflicted feelings for her sister...

"Isn't it romantic? The Family that fights each other fucks each other too!" Da Vinci giggled, doing absolutely nothing to hide the fact she was using a dildo modeled after Kama's true potential to keep her nice and wet. Pumping it in and out of her as she watched the three girls struggle to handle their rising lust. "Come on. Just give in. You'll all receive a treat if you end up taking everything in!"

Artoria was trying to keep her composure. Despite the might of her 'Son's cock. "Y-You... You won't... Youuu... Hhaaaaahhhh!" And yet she couldn't. Eventually, she was forced to collapse on top of this thick rod that was meant to be Mordred's. Collapsing on top of it and having her eyes roll into the back of her head as she just squirted all over the place.

"Father... M-Mother... Father..! Mother! FATHER! MOTHER! DADDY! MOMMY!" Mordred broke even harder than her 'Father' did, as the sheer girth of the cock that was meant to be her Mother's ended up driving her over the edge. Her vocabulary breaking down further and further until she could do nothing except scream in pure delight. She wanted nothing more than to have it keep thrusting deeper and deeper, which was why her cervix was on the verge of breaking as she sat down fully on that fake shaft.

Morgan was in much the same boat as both of her family members. Struggling the best she could. "T-To think... T-To think I'd lose to Artoria's cock... T-To another version of that frustrating girl..! Even if they weren't truly siblings, she knew about the way that Mordred had been born. So the fact that she was breaking by a cock like hers, breaking just like the other version of her had done... It was too much for her to endure, the sheer fact that history was repeating. Causing her to climax as her eyes rolled into the back of her head.

Da Vinci giggled as she watched each of the three British girls collapse and be claimed by pleasure. Ah. She could just let them sit there. Let them rest on top of those wonderful cocks. But where'd the fun in that be? She needed to make sure that they were being pumped full. She needed to make sure that they got everything that they deserved. And the remote that she held would help her do so. She pressed down on the Excalibur-shaped button, and watched as the balls attached to each of those fake cocks started to glow...

Moments later, each of the three girls were given their reward. They had done as Da Vinci asked after all. They had taken every inch of that thick rod. And as a result, they had won their prize. A thorough filling, causing so much cum to pump into them that it was rather hard for them to even come close to enduring. None of them were ready for this. None of them could even be close to ready...

So their screams echoed out. Filling the workshop with pure pleasure as their juices leaked onto the table, all while their bellies were being pumped full of seed. Seed that was meant to belong to the owner of the cock they were mounted on. 'Son' impregnates 'Father'. Mother impregnates 'Son'. And 'Father' impregnates Mother. Sending them down the exact same cycle that gave birth to Mordred in the first place. But this time, the lust inside them would ensure that they weren't going to be causing any trouble. Just making brand new memories, as they let themselves be consumed by lust.

Ah... Familial lust. Yet another delightful kind of lust that would birth such wonderful relationships. Da Vinci loved a sweet tale like that. And yet, it was nowhere near as strong as her favorite kind of lust. Indeed, there was still one that remained. One little experiment.

All she had to do now was call for Master...

---

"W-Why does this feel so good!? S-Senpai..!"

"Ehehehe. I can see you like my latest toy a lot, Mash. I'm very happy. And I'm sure Master is as well!"

Da Vinci couldn't help but giggle and rub her hands together. All while watching the adorable eggplant thrust wildly into the brand new onahole that she was gripping tightly. It was such a lovely sight for sure. Especially considering the shape of said onahole.

The onahole that Mash Kyrielight, Shielder class Demi-Servant, currently held in her hand... It was shaped like their mutual Master, Ritsuka Fujimaru. Only, there was one tiny problem. One that Mash was well aware of.

It wasn't just shaped like her. It was her. In fact, that was why she had come here in the first place. She had suddenly detected a drastic change in her Master's mana, and rushed to the workshop to try and figure out why. If push came to shove, she was even willing to try and hurt the one that was responsible. After all, this concerned her Master. Her Senpai! She wasn't going to let the one that hurt her get away with it.

And yet that was exactly what Da Vinci had been planning for. As soon as Mash came inside, she activated her Lust-filling device, successfully disabling Mash for some amount of time. It wasn't going to be for long, since the machine was still not at full power. But it was just strong enough to enable what she wanted.

By handing over that onahole, allowing Mash to hold it tight and squeeze it, the lust within Mash was set free. Causing a cock to shoot out from her crotch, throbbing and desperately craving a hole to punch into. And since there was a hole right there, she had no chance to resist it.

It was why Mash was currently thrusting into the onahole that had once been her beloved Senpai. Why she was furiously thrusting like she needed to breed. She tried to control herself. She tried to hold back. But there was nothing she could do. It felt so good. It felt so good to fill her pussy with her shaft. So much that she bit into her lip to try and stifle her moans and downplay how good it felt.

"Ehehehe. Think about it, Mash. Think about what Master might feel. How badly she might be enjoying your cock inside her. How you're stirring up her hole and making her feel absolutely phenomenal. Ehehehehehe..." Da Vinci loved every moment of this. Which was why she was goading the eggplant to thrust even more. She wanted her to fall completely. To fall victim to that romantic lust that she still needed to observe.

"N-N-No... I-I mustn't... I-I... S-Senpaiiii!" Mash cried out as she tried her best to resist. But it was practically impossible when paired with this wonderfully tight masturbatory aid. It was impossible to stop herself when it felt so delightful. It was like she finally got what she wanted. She got to be together with her Master. Her Senpai. And... And she was filling her, and she was going to cum inside her and make all of her sticky cum just splatter all throughout the insides of that onahole. All so she could... All..!

Mash threw her head back as she succumbed completely. Of course she couldn't resist. There was no way that she could ever resist something like this. She was completely and utterly subservient to her lust towards her Senpai. The girl that had helped her overcome many of her insecurities. The girl that had been there for her whenever she needed her. Of course she wanted to cum inside her. Violently.

Which was why she was forcing the onahole to press as tightly against her crotch as it possibly could go, pumping in ropes after ropes of thick and virile seed. All for the sake of thoroughly filling this toy. All for the sake of filling it so much that there was absolutely no space left inside. She didn't care if it was going to leak out. She was going to blow her load inside her. Again and again and again..!

Indeed. As soon as she had orgasmed once, she went right back to thrusting. Even though her cum was being splashed back out of the onahole. Even though the onahole had distended from how much had been forced into it. Even though it was gradually losing its form thanks to how badly she was abusing it. She just kept doing it...

And Da Vinci watched every moment of it. Watching as Mash showed the greatest lust of all, the one that gave birth to love. The affection and desire that one had for another. It was why she was this furious. Why she couldn't stop craving her Senpai. It was also an adorable sight for sure. Heh. To think that a girl like her could be such a potent fuck-machine. She'd almost have to run tests to try and see if she could make new relationships with others, using that brand new cock of hers.

But for now, she had to report to her dear Goddess... Mmmff... She was probably waiting for her to tell her everything. So she could see just how much she had learned by trying to research things this way...

Kama was going to enjoy it, that much she was sure of...

---

"Well. You certainly took my words to heart, Da Vinci. I don't think I've ever felt this much lust in one place before."

"Ehehehehe... T-Thank you, my Goddess... Thank you soooo much!"

Kama was... Okay, she wasn't unnerved. But she had to admit that she didn't expect Da Vinci to go this wild. She expected her to try and experiment a little. Maybe even get Master over and admit her horny feelings for her. She didn't expect her to turn her workshop into an experimental fuck box.

On one hand, the workshop looked completely normal. Nothing out of the ordinary at a glance. But as soon as one tried to get a feel for the world around them, they'd instantly realize the truth. That she has somehow found a way to replicate the workshop endlessly. Each instance of the workshop contained yet another set of Servants that were currently being experimented on in so many different manners. Whether they were being treated like horny animals, being forced to breed with one another in absurd ways, or simply made to fuck endlessly.

Kama was almost jealous. Almost. No, wait, she was definitely jealous. She just didn't want to say it out loud or admit it. Causing her to huff as she crossed her arms and turned away from Da Vinci. She didn't want to acknowledge her more than necessary.

Unfortunately, she made a grave mistake. She turned her back on Da Vinci. And since Da Vinci was still filled with so much lust... Well, she couldn't control herself. Especially when faced with the Goddess of Love's fat ass. A fat, matured ass, as she had managed to regain her older form due to all the lust that had gathered in Chaldea.

All that Kama could notice before she lost control of the situation was the sound of something turning on, and then the feeling of intense lust reverberating through her. "W-Wha... D-Da Vinci, damn you..!" Thanks to her nature as a Goddess, the device that Da Vinci had turned on was a lot less effective on her. But that didn't stop her from getting far too horny than she had any right to be.

"Ehehehehe... Ehehehehe!" Da Vinci couldn't stop herself from giggling as she immediately launched onto Kama, wrapping her arms around her and squeezing tightly before slamming her cock straight into that hole. There was nothing that really got in her way, so she just thrust as hard as she could. Sinking deep into her defenseless hole, so that she could dominate and fill her Goddess with lust!

Kama immediately let out a powerful moan. She didn't expect her to stuff her cock up her ass. And thus, she ended up on her knees. Bent over, hands against the floor. "H-How did you grow one that quickly!? M-More importantly, cease! G-Get off me, you horribly horny maniac!" She tried to protest and figure out how Da Vinci had acquired a cock. And demanding that she got off, as she had no authority to be screwing her like this.

But Da Vinci didn't listen. She just rammed deeper and deeper inside. Pumping her hips back and forth, pistoning like her life depended on it. All for the sake of being filled with even greater lust. "Aahhh! Goddess... Gooooddesssss!" Da Vinci cried out, as she kept on thrusting harder and harder.

This was bad for Kama. If she kept up doing this, she might actually be broken by dick. She didn't even think that it would be possible, since she couldn't fall for many of the people here. And Ritsuka... Well, she didn't have a dick in the first place. The one person that had managed to gain some amount of affection, and she wasn't even the one trying to fuck her. Ah... Ahhh... D-Damniiit...

Not long after Da Vinci had started to fuck Kama's ass, the Goddess started to cum. Her holes were tightening as they leaked plenty of juices, while trying to wring some sticky juices out of the perverted pouncer in turn. And she certainly succeeded, as it didn't take long before Da Vinci started to release plenty of cum inside her hole.

Even then, Da Vinci showed no signs of slowing down. Condemning Kama to a fate of her own making, as the cock inside her gradually made her fall more and more in love with it.

Truly, Da Vinci had learned exactly how love came to be. And it was all thanks to her Goddess' kindness...