It was a calm evening with clear skies in Equestria. Kian the Lombax slowly walked into the main barn at Sweet Apple acres, being ushered in by Applejack from behind. He couldn’t believe this was really happening, the situation felt like a fever dream. The day had started with Kian finding an advertisement in the paper, in which the Apple family was looking for male participants of different species to donate their sperm for research. It would be collected via machine, then sent to Twilight Sparkle for further study. But despite the friendly nature of the ad, the young black and green creature was still extremely nervous about volunteering. 

“Are you sure this won’t hurt, Applejack? I’ve heard these cow milking pumps are really strong…” He pointed out with a bit of hesitation in his voice. However, the farm pony seemed very relaxed and encouraging as she directed him towards a pile of hay next to a large cylindrical unit in the middle of the building. Red evening sunlight shined through the far windows, reflecting off the yellow hay and metal canister. She quickly used her teeth to grab a white and black outfit from her saddlebag, and held it up for him to see with an excited expression. 

“Don’t you worry partner, I’m sure you’ll enjoy this. Now here, I need ya’ to put this cow costume on. You gotta get in the mooooood for milking, my friend...” She winked at him. Kian chuckled at her pun as he grabbed the spotted cow outfit and slipped into it. The fabric was fairly tight, and it had a circular cutout in the bottom for his penis to slip through. He wasn’t used to roleplaying, but the thought of becoming a cow made his lower regions tingle with anticipation. Applejack smiled in amusement as she studied her new bovine subject. He looked so cute in the costume; it made her blush. The green pattern on his body was now covered up, which made his bright eyes stand out even more.  Kian began to feel flustered from her intense staring. Before she could get too distracted, Applejack decided to get straight to business. 

“Now Kian, you need to get down on yer’ knees for this part. Stay real still while I hook you up with some special gas.” The Lombax complied and lowered down on all fours, pushing his feet and paws into the layer of soft chaff. Applejack unholstered a mask off the side of the device and held it up in front of him. “This mask will give you a quick dose of aphrodisiacs to get you nice and hard. The effects should linger for a good while.” Before he could say anything, she pushed it forward and clamped it over his mouth. He immediately began to get a weird feeling throughout his whole body, as the effects of the compound slowly forced him into an aroused state. 

It didn’t take long for Kian to become fully erect, his black shaft jutting six inches out from his body. Seeing that he was ready, Applejack flexed her leg and kicked a big red power button on the nearby machine, causing it to rev up with power. She grabbed one of the metal teat cups, which was connected to a long clear hose that fed into the center of the contraption. The suction coming from the end produced a very loud and constant hissing. She inched forward and held the pump right underneath his throbbing shaft, pausing for a moment to appreciate the sight. Kian gasped as the device made contact, immediately sucking upwards and swallowing his whole cock in one swift motion. Shoooorrrrp! He shook from the sudden burst of pleasure, as the pulsing vacuum pump gobbled up every inch he had to offer. While he adjusted to the sensations, Applejack removed the mask to prevent from overstimulating him. She gently coaxed him on a bit more, stroking his ear with her hoof. 

“How does it feel?” She asked with genuine care. Kian felt overwhelmed by the scenario, and could barely form a complete sentence. 

“Ooaaaahhh, this f-feels *huff* incredible...” He muttered. Applejack cracked a sly grin, and rubbed her hoof over on his shoulder. 

“That didn’t sound like a moo, Kian…” Applejack followed up by turning a dial on the control panel, which rapidly increased the suction. Kian’s toes curled from the sudden rush, making his claws dig into the hay. Slowly, he began to buck his hips while the machine held tightly onto his ‘udder.’ The increased stimulation tipped him into a whole new frame of mind. He wanted to be sucked dry and milked now more than ever… 

“Mmm, Mrrrmm… MOOOOOOO!” He belted out, as his dick began to throb with almost painful hardness. He had never been so helpless, but it felt incredibly good. Meanwhile, Applejack couldn’t help but lick her lips at the sight of his twitching dick poking all the way through the pump and into the clear hose. A tip of vibrant green was visible, which seemed to shine with color. She knew that the apparatus was designed to keep sucking until milk was extracted no matter what, so this was going to be a big one. Kian continued mooing under his breath as he began to sweat profusely. The experience was like nothing he had ever felt before... After a minute or two, he couldn’t resist the pleasure anymore. His whole body shook as he thrusted his hips and came violently into the hose, unleashing a thick torrent of cum. The intense vacuum pressure sucked all the jizz right out of his cock, and he watched intently as the sticky liquid splatted through the hose and disappeared into the tank. The sensation was overwhelming, as the unit kept inhaling at full power throughout his entire orgasm like an insatiable beast. Applejack gave him an approving glance. 

“Wow, you really blew a huge load there! Let’s see if you can do another one…” 

Despite the mind-blowing orgasm and release, Kian’s cock started to feel hard again almost instantly. Feeling the milking machine’s unending thirst awakened a bovine side of him that he didn’t know existed. He wanted to give it more product… He needed to. 

“Turn it up, p-please… M-milk me harder! Suck my big fat udder dry!” He begged, his voice staring to crack slightly. Applejack fulfilled his wish, and turned the red dial up even more. Cli-click. The machine became audibly louder, and the suction ramped up very sharply. Kian went wide-eyed with pleasure, as his dick was stretched to its limit by the contracting rubber lining. 

“Agggh, ooooohh… MOOOOOO!” He yelled again as another orgasm creeped up his spine. He bucked his hips, making the hose sway back and forth in the air. Kian felt an intense wave of relief as he exploded inside the tube a second time, his cum being easily sucked up like before. His load was less than half as much as the first round, but the orgasm felt much stronger from the forced nature. Applejack grinned in amusement, then approached him and leaned against his side. She now held a different mask in her right hoof, and brushed it against his face. 

“You know Kian, how would you like to stay the night? You seem like a very productive little cow, and I think you could provide a lot more milk. Ah’ can give you some anesthesia to help you make it til’ morning if you want.” 

Kian gulped, still trying to cope with the constant stimulation on his dick. He wasn’t sure if he could do it, but Applejack’s warm and approving gaze told him otherwise. He quickly caved, feeling a carnal desire to keep going. 

“Ok. Put me *hurgh* under, I can do this…” He proclaimed, while breathing heavily. Applejack smiled in approval. 

“There we go, that’s the spirit. You’re a good cow now, aren’t you? Yes you are…” 

She slipped the mask over his face, then turned on a valve to release the chemical. Pssssssshhhh. The gas made an airy sound as it began to pump though the tube and into directly his mouth. Suddenly, Kian began to feel lightheaded. The anesthetic was fast-acting, and it helped him to relax. His eyelids began to feel heavy, and the feeling of his dick being sucked seemed to fade into the background. For a few moments he could still feel it, until he finally fell asleep on all fours. Now that her job was done, Applejack quietly turned off the lights and trotted back to the main double doors of the barn. She tipped her hat in respect to his commitment. 

“Sleep tight buddy. I’ll be back in the morning…” 

Ka-klunk. 

The wooden doors closed, leaving him alone in the barn to be subconsciously milked until the sun returned.