[Cow TF, Lactation, Brain Drain]

"Patchy! There's no more milk! You know I want milk with my tea!"

Patchouli Knowledge, the proverbial Unmoving Library, rolled her eyes at the sound of her good friend's voice. "I don't know why you're telling me that, Remi. You know I don't keep any milk in here." The lavender-haired Magician muttered as she looked up from her book, staring straight at the blue-haired vampire sitting across from her. And the blonde that was idly reading a childish book, while remaining nice and quiet for once.

"Yeah, but there's still no milk!" Remilia Scarlet, owner and mistress of the Scarlet Devil Mansion, shouted as she slammed her hand into the table between the two. "Flan, aren't you upset?! Don't you want milk with your tea too?" She roughly shook her younger sister's shoulder, to make sure that she was listening.

Flandre Scarlet, the younger vampire with the strangely colorful wings, blinked as she pulled down her book and looked at her sister... While drinking from a straw leading into the last bottle of milk in the entire mansion. All she could do in response to her sister's complaints was to just tilt her head ever slightly, as the last few droplets were slurped up her straw...

"Aaahhhhh! Flan! I wanted that!" Remi shouted, only to collapse into her chair as frustration started to pour over her face. While she put up a front of Charisma whenever she tried to go out in public, whenever she was alone with her close friends and confidants, some of her true nature started to pour out. Which was why she acted the way that she did, despite being five centuries old...

Patchouli sighed. She really just wanted her library to be nice and quiet. But at the same time, she had given Remi and Flan express permission to come and go as they pleased. And while it had bitten her in the ass more often than she'd like to admit, their presence kept her from eroding and atrophying until she was little more than a vague existence on a chair. "Can't you just have Sakuya go buy milk from the Humans?" She asked, looking to put an end to her friend's awful mood.

Just as the maid's name left the librarian's lips, a silver-haired woman appeared by the table, carrying a tray full of dishes. "I'm afraid that is not possible at the moment, Lady Patchouli." Sakuya Izayoi, the head maid of the Scarlet Devil Mansion, was almost always aware of anything going on within the massive building. Possibly due to the way she seemed to manipulate time, even she claimed it was little more than an extreme case of speed. "They've run out of milk, and its not the season for the cows to be milked."

Remi let out another frustrated groan as she heard that, and Patchouli had to join her this time as she pinched the bridge between her eyes. If they couldn't get milk from the Humans, then there was very little they could do. And honestly, she needed the milk just as much. While her preferred kind of tea didn't have as much milk in it, the extra sweetness and thickness that came with a small cup being added... It was something that made her tea feel just right.

Flan closed her book, stretching and looking to Remi. It wasn't often that she saw her sister being this down. So much so that she thought there might be something wrong with her. Prompting her to look to Sakuya, who didn't seem too concerned so it seemed like it wasn't actually that bad. So if Sakuya thought she couldn't help, then... "Patchy? Can't you help?" The younger of the two vampires asked, her eyes filled with light as she honestly had big expectations. She was a very powerful Magician, after all.

"I'm not the milkwoman, Flan." Patchouli said, closing her own book as she put it down on the table. All while she both the blonde and the silver-haired maid pointing their eyes towards the bosom that happened to be constrained within her thick robes. Not just them either, Remi's eyes had started to pour towards them as well. "And I'm not going to be the milkwoman no matter how long you stare at those things!" This time it was her turn to be frustrated, a shade of red pouring across her face...

Sakuya softly chuckled as she placed a hand on the Magician's shoulder to show her a bit of support. "It's alright, Lady Patchouli. They just gravitate towards the most natural source of milk. You know how it is." She said, before coughing slightly and drawing attention towards her own bosom which was nowhere near as large. "As much as it pains me to admit, you eclipse me in that regard. You've had much more time to let your breasts mature, compared to a human who's only lived for so long."

"You're not helping, Sakuya." Patchouli muttered. She really didn't need to worry about the weight of somebody else's envy. Especially since Sakuya wasn't... wait. Hold on. "...Repeat that, Sakuya. What did you just say?" The gears inside the librarian's head were currently turning. Spinning wildly to make sure she processed all of the relevant information.

Sakuya nodded. "Lady Remilia and Lady Flandre both gravitate towards your expansive bosom because it reminds them of a proper cow, so they imagine that you carry much of the same milk they both crave. Albeit I do not know if you're able to lactate, as I do not recall your body having experienced a pregnancy, so the milk they're trying to get might still be out of reach." She explained as thoroughly as possible, gently curtsying to show respect towards the girl who was so much stronger and knowledgable than her. She had no bad intentions, no malice hidden within her words.

The stare from both Remi and Flan was growing stronger as that explaination flew through the air. Neither of them bothered to try and act like they had dignity. They just wanted their milk. And if they had to suckle it straight from their friend's nipples, then they'd do it. Especially if it was just as rich as the milk they usually had to drink...

Patchouli smiled. Not because they were both so dangeorusly thirsty for her milk, but because she knew exactly what she had to do to make sure they'd be fed. "Sakuya. Hold still." She said, as she flipped open her book and magic started to pour from its pages. All while that smile of hers grew a little too foreboding, especially compared to the normal expressions making their way onto the librarian's face.

Sakuya could feel a sense of premonition overwhelming her. Though she didn't get the chance to act on it. For once in her life, it felt like she was too slow. Especially as that magic shot straight from the book and into her body, forcing her to moan loudly as it sank deep into the very fabric of her soul.

That moan quickly turned into a powerful moo as her maid uniform burst open, revealing a set of cow-patterned underwear that she hadn't been wearing just moments ago. Underwear that quickly grew tight as her body started to expand further and further, tits pratically pushing straight through the fabric of her bra. It felt like something wanted to burst from those big breasts of hers, and a headache was pounding on the sides of her head at the very same time. It felt like... it felt..!

"MmmOOOOOO!" Sakuya cried out as her nipples popped out against her cow-patterned top, all while a set of short but thick cow horns burst from her head. And at the same time, milk started to splash free from those extended nipples, the rich white liquid spilling right down onto the table as it became harder and harder for her to think. W-What was happening to her, what had Patchouli done? And why did these tits of hers have to be so heavy? Was this why Patchouli needed to sit down at all times..?

Remi and Flan's eyes had now gravitated towards Sakuya. Not just the milk that shot from her tits, but the milky cow maid herself. Flan was surprised and not really that bothered by the fact she now had horns sticking out of her head, while Remi felt her heart twisting a bit. Was this... Was this really the lengths she'd go to for milk? She'd have to try that milk...

At least, she would've tried the milk. If not for Patchouli trying it before her by casually gathering it all up using one of the types of magic that she had specialized in. She drank all of that swirling milk, slowly swallowing it to savour the flavor... Before her cheeks flushed bright red. It was even richer than the kind of milk you'd get from proper cows.

"Well, Remi." Patchouli said with a smile as she got up from her chair. All so she could walk right behind Sakuya and carefully caress those slender shoulders. "I think we won't be running low on milk anytime soon. If Sakuya keeps pumping out this level of milk, then..."

The Magician's hands sank into those massive udders that stuck out of the maid's chest, and she quickly let out another mooing moan in turn. Milk splattered right past the tight fabric as it spilled all over the desk, with Sakuya growing more and more rigid as she just stood there and let it happen. She should've tried to do something to stop this, but her head felt emptier and emptier...

Was there even anything left inside Sakuya's head? Not really. The only thing she felt was something sloshing around inside there. It was kind of like the milk that got squeezed out of her udders. It felt nice to have it slosh around, but she didn't really get anything out of it. She just smiled and mooed whenever she felt satisfied, and that was good enough for her. No matter how much poured out, no matter how much her udders were being squeezed, it all just felt really good...

Flan watched as all of that milk was pouring out from those big nipples. It was almost a bit of a waste. But she wouldn't just latch on and suck. Not while Patchy was busy milking the maid. It'd be rude. That and she didn't want to accidently bite her. She had already done that once, and that resulted in her getting a piece of wood in her mouth until she learned not to bite. She didn't want to experience that again.

Remi, meanwhile, had that worrying feeling in her chest increase. But this time it wasn't because she was worried about the measures they were taking to get milk. No, it was something about the way that Patchy was milking her maid. Something about seeing those mounds being kneaded. Something about seeing those slender digits sink into all that tit flesh. It made her squeeze her thighs together as she tried not to make a sound. Trying her best not to pant or to moan or to gasp. Because it was making her feel hotter and hotter...

As Sakuya mooed once again and very nearly collapsed as she started to get tired, Patchouli finally let go of her chest and allowed her to just stand there and recover. All while just looking straight ahead with a completely drained and empty smile on her face. She had been milked, she didn't need to worry about anything else...

"Well, Remi? Flan? You want some milk with your tea, or-" Patchouli said, before turning towards the two vampiric sisters... And slowly smiling as she noticed the kind of expressions that they both had. Hold on, they didn't want milk to drink. No, they wanted something much simpler. Something that made her instinctively start casting a spell, her book starting to power up in response to her desires...

Neither of the two vampiric sisters were able to stop the spell once it had been cast. Both of them struck straight in the core of their being as they started to feel a pressure building in their head and in their chest, just like what had happened to Sakuya. A pressure that was even stronger, as if it had grown so much stronger because it was flowing through bodies like theirs.

"P-Patchy..!" Remi cried out as her dress burst open and a bigger moan echoed out from her lips as her previously completely flat chest suddenly exploded outward into a set of fat and milky tits that were even bigger than her head. They were heavy, just like the weight of her own needs and desires on her shoulders. All while they were kept nice and compressed inside a matching set of cow-printed underwear... Underwear that had already gotten soaked thanks to the subtle milk drooling out through the fabric.

Flan panted and gasped and moaned as her own explosive growth was even more violent than her sister's. In fact, her breasts were that much bigger than both the maid's and the eldest vampire's. Probably because her power was so much stronger than theirs. All of that power had seemingly been converted to extra size for her udder, the blonde panting and moaning as the weight of her brand new tits was weighing down on her mind. She had a lot of milk inside her boobies, didn't she..? She kinda wanted it...

Patchouli chuckled softly as she looked at them both. Both of them, with their shorter horns than the ones that poked out of their maid's head due to their natural short stature, were already on the verge of becoming such perfect cows. They just needed a little push to be perfect. Then they wouldn't be able to resist their brand new nature as cows. A nature that she had forced upon them with a little spell. A nature that had already consumed Sakuya, which was why the maid just stared straight ahead without a care in the world as she continued smiling...

"Feels good, doesn't it?" Patchouli said as she carefully put her hands on Flan's breasts, slowly letting her fingers sink into those massive mounds. Squeezing onto them. Kneading and letting the sense of pleasure pour all the way through the young blonde's body. "It feels good to have these hanging off you. It feels good to have my fingers dig in like this, doesn't it? Of course it does. Because you're nothing but a cow, Flan..."

Flan couldn't really struggle against this sensation. She wasn't used to pleasure in general. So having her brand new bust, which was so much bigger than her head, played with like this? It was making more and more milk splash around inside there, which was weighing her thoughts down more and more, making it harder and harder not to let out one big "MooooOOO-"

And right as she opened her mouth to moo, she was cut off by her nipples being stuffed straight into her mouth. The young vampire with those massive tits was now forced to suckle straight on them, those two pink milky nubs practically stuck inside her mouth. And since she had no self control, much less a stable sense of self to fight back against this treatment, she did exactly what Patchouli intended for her.

She started suckling. She suckled her own milk. And the cow that had once been a cute vampire started to muffledly moan as she swallowed more and more of her rich and creamy milk. It felt so good to suck on her own breasts. It felt so good to suckle down all of that rich goodness. She loved milking herself. She loved that sensation so much that even though her udders weren't being stimulated or kneaded, she could still drive herself further and further up the orgasmic ladder. And even as thick clear liquids started to pour down her thigh, indicating the pleasure having forced her to climax beyond belief... She still kept on suckling and just started the cycle all over.

Remi was panting as she watched her maid just staring straight into space as more milk drooled down her breasts. All while her sister just suckled on her own udders. It was humiliating. But a part of her heart, the part that was being taken over by this spell that had transformed her into a cow, was filling up with more and more envy.

"Don't worry, Remi." Patchouli chimed as she walked right behind her blue-haired friend. "I wouldn't leave you out of this. I know how much you want your milk." She giggled, the tone of her voice far too foreboding compared to its normal tone. It was almost like she had spiraled out of control once she transformed one of them into cows.

Remi tried to get away. But she couldn't. Not once those slender hands dug into her breasts. Not as she felt them kneading away at her milky mounds. Not as that stimuli was making it harder and harder for her thoughts to move through her mind, because those thoughts were being churned into more milk.

"There there. Just worry about your milk, Remi. You're a cow now. You don't need to worry about anything else. It's a fun fate, isn't it? To just be milked all day..." Patchouli whispered into her friend's ear, all while her hands got closer and closer to those fat nipples that were squirting milk bit by bit. "It's your fate, Remi. Just accept it and let it all out."

With those powerful words pouring into her mind, how could Remilia possibly resist? All that she could do was let out one big cry of pure pleasure as the milk squirted forward, and her body slumped against her chair. Mind completely gone, thoughts drooling out from her nipples.

Patchouli smiled, looking over the completely empty cows. One silver, one blonde, one blue. All of them milkier than any other cow in Gensokyo. And not only could they all give her plenty of milk... She also had the chance to sit in silence and just read when she didn't need milk.

Finally, she'd have silence. All while she could enjoy a good cup of milky tea.