Donating Milk

On the day of her appointment at Ponyville's hospital, Derpy woke up feeling amazingly horny, which was apparently becoming her new normal ever since she'd taken note of her functionally limitless milk and shared it with Berry Punch. She'd grown, then, which had been amazing. Hefty G-cups, utterly ridiculous on her frame. Thick and prominent nipples which were difficult to hide. Whenever Derpy had spotted another pony taking note of the way they tented her shirt, they'd grown erect.

Thinking about her breasts certainly didn't help her arousal. She felt engorged, which was something which had literally never happened while she was actively nursing or in the time between weaning their daughters off and discovering that her milk hadn't dried up. Berry had already pointed out how little sense that made.

Derpy could feel her glands frantically brewing up more and more milk. She'd felt that way all the time for the last few days, but it was more intense at the moment. Perhaps she'd had a particularly motivating dream? She tried to remember, but the details had already slipped away. She'd had very large breasts in her dream, but she hadn't been big enough.

That feeling was also a new constant in her life.

Did she wake up horny every morning because of the dreams she was having? Or was a good night's sleep simply too long a time without playing with her boobs, so the new demands of her body made any dream steamier?

There was really no use denying that somehow, acknowledging the powers of her rack had kicked off changes which should have worried her. Instead, she felt delighted. She enjoyed the peculiar awareness of her breasts. Even her lust had taken on a new dimension. In addition to the familiar heat between her legs, her tits seemed to grow terribly sensitive. Keenly aware of her erect nipples under the bed cover, she hardly dared to move.

Derpy spent a few minutes holding still, enjoying the way her breasts throbbed insistently, sending arcs of pleasure into the rest of her body. She was pretty sure she could get herself off without immediately spraying milk all over the bed, but it seemed smarter to practice that kind of control some more.

Shouldn't she resent the fact that she apparently needed to get used to functioning day to day while highly aroused because her breasts had turned into sources of breathtaking pleasure? She didn't mind at all. She looked forward to growing bigger breasts, which would provide even more pleasure, so it only made sense to get used to that sort of thing now. She intended to do the best possible job of being a mother to Dinky and Ruby Pinch, after all. Self control was going to be of great importance.

Thinking of her family dulled the edge of her arousal. The heat seemed to pulse through her in slow, comfortable waves, and Derpy marveled once again at how cooperative her body was being. Even though during the last few days her mind had constantly wandered to her breasts and some of her fantasies had taken on an increasingly exhibitionistic bent, her escalating libido hadn't particularly hindered her in the daily business of taking care of their daughters.

Derpy supposed that if she squinted, it made some sense that something as maternal as her boobs wouldn't want to get in the way of her actually taking care of her family, even though they and her milk were never far from the forefront of her mind.

She strained her ears briefly, hearing Berry putter around in the kitchen. The other mare was an early riser. So were the fillies, but Berry was nice enough to let Derpy sleep in every so often. The earth pony was probably making breakfast for their daughters. Her voice was audible, since she tended to explain what she was doing when the kids were present.

At least Derpy knew that her attraction to the other mare had been growing before she'd discovered the power of her boobs. Berry had never much cared about other ponies, treating them nicely mainly because it was expedient, so seeing her put so much effort into caring for her own daughter and Dinky was a delight.

The fact that Berry enjoyed teasing Derpy about her rack and touching her breasts made the whole thing even better. Maybe Berry's general indifference regarding what other ponies thought had allowed her to voice fantasies Derpy had needed some encouragement to contemplate. She hoped there was more to discover about her breasts.

She wondered, not for the first time, what it would be like to have boobs so big they dominated her entire upper body. Maybe they could hang up mirrors on all the walls and the ceilings. It'd allow Derpy to admire herself from other angles, and she foresaw herself picking up a lot of things from behind her to keep her tits out of the way.

Derpy couldn't stifle a moan. Contemplating the adjustments huge breasts might make necessary inflamed her lust even more. Her back arched, she involuntarily bucked her hips. She badly wanted Berry's strong hands on her demanding tits. She wanted to be bigger. Wanted everyone in the whole town to be in awe. She wanted to let her milk flow unrestricted.

She threw off the covers and practically leapt out of bed, setting her breasts to jiggling. It would be better to finish this in the shower. It was hard to think of anything but her milk. She produced more, every moment, more than any one pony would need. The weight of all the milk she hadn't shared since her daughter was born seemed to press down, threatening to smother her mind.

As soon as she had closed the bathroom's door behind her, Derpy started probing her sex with a few fingers while playing with her clit. She came quickly, managing not to let down her milk with a heroic effort of willpower despite being rendered nearly insensate with bliss.

Her breasts apparently resented being left out. They churned and sloshed with her movements, and Derpy wasn't sure it was a real sound or just a sensation being sent directly into her brain. Internal pressure caused them to bloat, fat and round, until they sat high on her chest as unnaturally firm globes. There should have been discomfort, but the aching fullness felt like an amazing gift, already stirring her up again.

Over the last few days, this had begun to make more and more sense to Derpy. If her production was endless and her capacity infinite, or at least vastly greater than her size should allow, any degree of engorgement could only be meant to add variety to the intense pleasure her tits could unleash. Self-evident, really.

Derpy took a deep breath. Given the state of her boobs, she'd been prepared for the relief of her quick climax to be temporary. She turned to the mirror above the sink, greeted by her own self-satisfied smile. She wasn't the skinniest of pegasi, but even so, most observers would probably consider her tits to be wildly oversized for her frame. She found them highly attractive but simply not big enough.

She permitted a few tiny drops of milk to bead on her thick nipples. Berry found that degree of control to be impossibly ridiculous, but right now it was more difficult than during previous tries because Derpy's great glands still hadn't entirely settled back down to their usual level of production after whatever had riled them up in her dreams. They were so eager, so desperate to just gush endlessly until her appointment at the hospital later. She could tell everyone she met on the way that she was going to donate breastmilk, like it was the most obvious thing in the world.

Everyone needs to see and understand.

She turned a few degrees to the left and right, pivoting at the waist to set her boobs wobbling, feeling and watching their beautiful heft. She looked forward to more. Of course, her dreams of larger breasts and more milk were just desires and ambition, not an actual pressing need. Derpy was and would remain in control, even if it required a little practice. She'd set the pace on her path to impossibly vast tits, not her libido.

A minute release of control allowed her milk to run down along the lower slopes of her breasts in thin rivulets. She delighted in the way she could feel those trickles of milk move along her skin, so sensitive did her boobs get when they demanded to show what they could do.

There was a knock at the bathroom door. "Turn away from the mirror, Derps," Berry barked.

Derpy wiped a strand of drool away before it could drip onto her chest. "Sorry, got lost in thought!" Her friend had made the correct guess on not hearing her showering for ... there was no clock in the bathroom, but it must have been some time. Looking at her own breasts could be distracting. Another area she'd have to practice control if she wanted her boobs to take up more and more space at the lower edge of her vision, cleavage stretching ahead of her.

Time to take that shower, allow the milk to flow to calm her tits and bring herself off another time or three before facing the day. To Derpy's mounting regret, they didn't have a shower stall she might one day get stuck in, just a curtain around their tub.

She turned to face it and just for a moment, she was hit by a mental image of herself and Berry crammed into the bathtub as it overflowed with milk. Renewed arousal crashed through her, from her tits to her loins, and several powerful squirts of milk escaped before she reasserted control. Derpy had to steady herself against the wall momentarily.

She wasn't put off by the lapse, and anyway, it was delightful to find yet another fantasy. She'd suspected something of the sort when she had noticed that filling smaller containers with milk had been oddly enjoyable. The tub was probably a natural development of that.

Showering had become more significant since her boobs had ... woken up? Come alive? Especially when her sensitivity was up, the spray of water was unbearably pleasurable. More than that however, there was the mental component. The forceful spray of the shower head felt like equal parts motivation and challenge. It had only been a few days, but as far as she could tell, refusing to let her milk run free during the process meant she'd be significantly more easily distracted for the rest of the day, especially when encountering other ponies. In that state 'gush uncontrollably' had steadily moved to the top of her list of responses in any social interaction. It was, frankly, impractical, so she'd have to relegate that sort thing to weekends, or at least warn Berry in advance the next time she was going to go around in that state.

Fortunately, playing with herself in the shower was a decent way to avoid making a mess, and giving her eager tits the attention they deserved would give her a few hours during which her rack would be largely unaffected by her heightened libido. Derpy suspected 'horny' was her new healthy rest state, but it tended to be a pleasant, languid heat which hadn't been too distracting. Would neglecting her great abundance turn her lust from comfy to desperate and make her more likely to have flashes of lewd fantasies, or did her simmering arousal naturally come to a boil sooner or later, causing her rack to respond with increased production and a demand to release some of her bounty? It was too early to come to conclusions. Maybe it was a vicious cycle of both, made worse whenever there were ponies present who didn't already know what Derpy was now capable of.

All Derpy knew was that when her boobs were calm, it was her choice to dispense milk. Once she started feeling backed up and engorged, it instead required a constant effort of will to keep the milk in. The shower was an ideal place to blow off steam and waste a lot of milk to satisfy her great glands that she was still aware that she'd never run out. She was dimly aware that other ponies would be concerned about suddenly having to manage the severity of their constant arousal and how it interacted with constant milk production.

Derpy took the shower head in hand to aim the water at the undersides of her boobs. She wondered how long it would take her to get so large it would be faster to have Berry help her clean her awesome milk factories. Derpy also wondered idly how the other mare would tease her with the bathtub fantasy. She'd probably go 'Huh.' and then innocently ask if a lake bed counted as a container.

The image of Derpy filling up the nearby dam's reservoir with her milk while Berry massaged her tits slammed into her mind, displacing all coherent thought for several moments. Derpy groaned, going weak in the knees. She tried to adjust her stance and nearly lost her footing. Extending her wings to aid in balance, she pushed away the shower curtain until it hung outside the tub and failed to protect the floor from the water.

It might have been worse if the shower head had still been up on its mounting. She dropped it into the tub, which didn't entirely help matters as the spray's force turned the loose nozzle to and fro. Derpy scrambled to pick it up and ended up gracelessly flopping down into the tub, bumping knees and elbows painfully.

She sighed. On review, she hadn't felt very horny in that startling moment where she thought she was about to slip and bust her head open. The flow of her milk had stopped as well, which probably meant she'd wasted enough to appease her breasts. With some effort, she managed to pull the curtain back inside the tub.

"Ugh."

She felt clumsy and embarrassed about it. Her tits weren't quite large enough to serve as an excuse for lack of coordination. Of course, Derpy had never been one to dwell on minor frustrations for long. She assumed a sitting position as though she were taking a bath. Climaxing as easily as she did was delightful, but that didn't make it less satisfying to actually put in an effort and masturbate with intent.

Using one hand to spread her lower lips, she held the shower's nozzle close to her sex, moaning at the stimulation. "Mmmh, I need you, Berry." Derpy imagined herself with melons fat enough to get stuck in the tub, making it necessary for the strong earth pony to rescue her while fountains of milk erupted from huge nipples. Maybe if Derpy's arms were trapped under her tits, Berry would just dig her rough fingers into her swollen jugs to try and pull her out.

Her depths clenched on nothing as escalating waves of pleasure rocked her. She sprayed milk from twitching nipples, not because she needed to but for the sheer delight of it. Derpy didn't even need to touch her breasts, the memory of the first time Berry had groped them forcefully at her command was still amazingly vivid in her mind and on her skin. The combined pleasure from her nethers and breasts left her convulsing wildly, a vast storm of bliss swallowing up her thoughts as her eyes rolled back. By the time some remnant of coherent thought decided that her clit could use a little more directed attention, her own touch served as little more than the trigger to an immense, noisy orgasm.

She used the shower head to give herself another once-over once she'd called a halt to her milk output. While it was nice that her efforts were well rewarded, she was eager to find out what it'd feel like to actually make love to Berry beyond having her massage Derpy's breasts.

She got up and turned off the water. As expected, water had run down the curtain while it was outside the tub's edge. It was a right mess, but the clean-up seemed worth it to Derpy. She examined that thought, wondering about it. A month ago she'd have been quite annoyed at the mess. She'd been bothered by her clumsiness earlier. But it could be traced back to her boobs and the pleasure they brought, so the extra work of cleaning up didn't bring her mood down. Still, even if she wasn't bothered, it was pretty clear that Berry's idea for a dedicated shower room would already be useful right now, if only for better footing than the shape of the tub allowed.

She shrugged and set to the task unhurriedly. "Berry! Bit of a flood!"

"What sort?"

"Water!" The clarification had only become necessary recently, so Derpy forgave herself for the oversight.