This is story request for @xxxhucow, she's awesome so everyone go visit her blog and encourage her pumping. Had a lot of fun writing this and thanks for the prompt!
When your breast pumps finally gave up the ghost after years of owning and using them, it wasn't so bad. It was a little disappointing, and using your hands was tiring, but you made due for a while. Until you finally gave in and bought new ones, after the urge to pump for hours on end was too much. You picked a small brand, not a lot of reviews, but they seemed ok and were very very cheap. Shipment was delayed a week, and by the end of it you started to actually feel backed up. Your tits weren't too swollen, they still fit in all your bras, but the tightness just wouldn't let up.
When they finally arrived, you immediately opened the package and within minutes, they were pulling away at your nipples. Bliss and relief mixed wonderfully as your long sought after need is met. You lay back on the couch, letting your lovely new pumps pull and pull and pull. Hours seem to pass before you finally stop pumping and sit up. Your nipples are so puffy and sensitive that even when you tenderly place them into your softest bra, electric shock shoots up your spine and instantly your brain is demanding you pump more. But you resist the urge, and try to push it out of your mind as you go about your day. Shopping, chores, watching tv; full, if not exactly busy. But no matter what, during all the quiet periods the nagging sensation comes back, and the heaviness in your chest, which couldn't actually be real, is almost enough to pull you back to the couch.
The day finally ends, and you go to sleep ready for another day. However, when you wake, you're groggy, sweaty, and shocked to find the pumps sitting on the bed next to you, the batteries dead but cups still attached. As the shock subsides, you begin to wonder if you simply don't remember coming to bed with the machine and falling asleep with it running. For a split second, you almost think that the pumps came up to your room and attached themselves, but it's such a silly thought and you brush it aside. Turning your still dazed attention to the cups, you gingerly remove them and it's sweet agony as they pop off, something that normally doesn't happen. You gaze down at your fuller looking chest, but hasn't actually changed size you think, and your eyes rest on your poor abuse nipples, they're bright red and have been under pressure for so long they seem like they might be perpetually hard now. Running a hand over them sends that thrill down your spine, but instead of an overwhelming need to pump more, a wetness flows from between your thighs, and you fear the worst as it sinks into the sheets, but as you whip away the covers, relief greets you. The sheets are soaked, but you realize that it's simply your own slick, pouring from you. It's also at that moment, that your brain catches up with your body, and an incredible urge to masturbate washes over you. Flopping back down, your hands find their way between your legs, and with one hand you madly swirl your clit and the other slides two fingers in with ease. The wetness only builds as you lay there, squirming and thrashing. The cool morning air almost stings your nipples as they bounce and sway in time with your movements. You curse your luck with the pumps dead batteries, only to see that the machine has a long thin cord wound underneath it. Breaking away from your pleasure, you fumble madly with the machine, almost falling out of bed trying to plug it in.
When the machine whirs to life, joy and excitement blossom inside you. Shaking from your excitement, it's hard to slip the cups on, but once they have a good seal ecstasy washes away everything else. Your hands immediately dive back to their jobs, and you desperately drive your fingers in and out as the suction grows stronger and stronger. Orgasm after orgasm roll over you, but not even exhaustion and stop you now. Over and over you bring yourself to the peak, and over and over again your convulsing body sprays cum nearly across the room. You can feel your eyes roll back, the world blurring in pure bliss. But soon, it begins to sharpen again. This time, however, you're looking down at yourself, writhing in pleasure on an increasingly soaked bed. But what you mostly see is your chest, still bouncing and jiggling as your body shakes. And it's not long before you notice the growth. Your tits are swelling quickly, your respectable I cups blow past your goal of Ks, and show no signs of slowing.
Larger and larger they swell, you can feel the weight pressing you further into the mattress, even as you float above yourself. Soon, they've doubled in size, and not only your chest, but your hips have gotten wider, your thighs thicker, belly jiggling almost as much as your chest was. An itching sensation draws your attention to your head briefly, as flapping ears and tiny horns sprout from the top of your head. However, nothing can hold your attention for long, as you zero in on your chest again. You doubt you could even reach around it, let alone squeeze it into a shirt and bra. Your nipples have grown and puffed up so much that the very tip is the only thing the cups can still find purchase on.
It's not long before your vision starts to fade again, your body still struggles against the pleasure, but it's starting to catch up with you, and before you know if, your vision goes black and you pass out. Hours later, you awake in the pitch black. Night has fallen and you're not sure it was a dream until you try shifting. Your hands instantly feel around your chest. It's huge, much larger than anything you thought possible for a human, easily too large to reach around, but somehow not too heavy to sit up and grope for the light. Your tits cover your legs entirely, and as you try to stand the new weight takes you off balance, almost crashing into a wall. But, you manage to stumble to the nearest mirror, thankfully a full sized one. However, even that's not enough to encompass your new body. Your chest is immeasurably large now, and so full and sits up so high. Your nipples are still very puffy, but to your delight, you see they've somehow inverted, and as you watch and get more turned on by them, they slowly peak out from their folds and are soon poking, easily bigger than some woman's breasts. But you don't let that distract you. Turning you see how much your hips and ass have grown, no pants will ever fit again, but then again with a chest like this you don't think you'll be wearing much clothing ever. Finally, the last thing you inspect are the new ears, horns, and tail. They're soft to the touch, but the horns are real and very firm. The tail swishes, as if with a mind of if's own, and your ears certainly twitch and flop around.
Returning to the bed, you're tempted to pump again, to see just how big you can go, but sadly you find the cups cracked, almost certainly because you outgrew them last night. It's not long before you settle back down, but as you do, another wave of tightness hits you, and as you shift to get more comfortable, you watch in surprise as a thick, long spray of milk gushes from your tits, showering the entire room in sweet smelling milk. Bliss threatens to overwhelm you again, but you fight it this time and jiggle your way to the bathroom where you do your best to lay down some towels, and with no small amount of regret, start squeezing your gargantuan chest. Milk flies from the puffy nipples in huge gouts, easily filling the bottom couple inches of the tub, the drain not able to keep up. And soon a rhythm develops, squeezing with your arms and pushing outwards, keeping your hands free to scroll on your phone. And the first thing you do, is track down the largest swimsuit you can find. You find one meant for L-cups, but giggle as you look down at your chest. Still, you order it with rush shipping, and let your thoughts drift off as you mindlessly milk yourself.