“Is there anything I should know about this? Like, uh…” Jake squinted, trying to remember the training he’d received. “...special instructions?”

“Just don’t break the vial,” said Twilight Sparkle. “That was probably obvious, huh? Thank you so much for doing this, I’ve got a million things to keep an eye on here in the castle, and Spike’s not here at the moment…”

“No thanks necessary,” said Jake, tucking the vial into his back pocket. “It’s my job, remember?”

“And it looks like it’s a good fit for you!” said Twilight. “I bet you’ve gotten to know the town pretty well by now, and met all sorts of ponies!”

“Yeah,” said Jake. “I mean, it’s still a bit of an adjustment, not being around other humans.”

“Oh, I’m sure it is,” said Twilight sympathetically. “But I think you’ll find that ponies are pretty easy to make friends with!”

“Well, yeah,” said Jake. “But I don’t just mean for friendship, I mean like…”

As Jake trailed off, recognition dawned on Twilight’s face and she gave him a knowing smile. “Hey, there’s plenty of eligible mares here in Ponyville,” she said, nudging him with her foreleg. “You know, I’m free later today. Once you get off work, why don’t you courier me some takeout and we’ll talk about how you’re doing?”

“Sounds good,” said Jake. “And the vial… the professor’s train is coming through at 1:15?”

“Yup!” said Twilight. “She’s just passing through, so make sure you get it in her hooves while her train’s at the station.”

“Will do!” said Jake. With a wave, he set off into Ponyville, leaving Twilight to her work. When he met her later today, he’d have to ask her just what he was transporting; it couldn’t have been too dangerous, if Twilight’s only instruction was “don’t break the vial.” From what Jake knew of magic - and Twilight’s work with it - the fluid in the vial could be something incredible and world-changing, or maybe just a dry and technical variation on some rather mundane spell. Probably closer to the latter than the former, if she was entrusting it to a courier.

Jake’s pace slowed as he passed by a sandwich shop. A quick glance at the clock in the window told him that he had plenty of time to kill before making his delivery; it wasn’t yet noon, he was close to the train station, and he had nothing to do until he had to hand off the vial. This was as good a place as any to settle the rumble in his stomach, so he took a seat at one of the outdoor tables and opened a menu.

But sitting down was a mistake - or rather, putting the vial in his back pocket had been a mistake. The glass snapped beneath his weight as he lowered himself into the seat, and the vial was so thin that he neither heard nor felt it happen. And the liquid inside was just close enough to his body temperature that he didn’t feel it seep through his pants, settle on his skin, and quickly evaporate.

So Jake had nothing but sandwiches on his mind as he sat at the table and soaked in the sunshine. He ordered his usual from the waitress - whose eyes seemed to linger on him after she took his order - and enjoyed his meal, just like on any other day.

The only thing that seemed even a little unusual was the attentiveness of his waitress. He didn’t really mind - she was nice, and very pretty - but she seemed very interested in how his meal was going and whether she could do anything to make it better. Even for Ponyville, this was more niceness than Jake was accustomed to.

But it certainly wasn’t unusual enough to distract him from his job. With time to spare, he finished his meal, laid out some bits on the table, and stood up from his chair…

And he’d barely been standing up for two seconds when a pony’s snout bumped into his ass, hitting him with nearly enough force to knock him over. Stumbling forward, he turned around to see who’d hit him.

“Oh, I’m so sorry!” said a mare that Jake recognized as Bon Bon - cream-colored coat, pink and blue mane, pieces of candy for a cutie mark. She was nice enough, based on the handful of interactions Jake had had with her, and she seemed genuinely apologetic for bumping directly into Jake’s ass. “Are you okay?” she asked, circling him to get a look at the point of impact.

“Yeah, I’m fine,” said Jake. “Humans aren’t that fragile.” Bon Bon was behind him now, scoping out the back of his pants, so he turned around - but Bon Bon just kept circling him, keeping her eyes on his butt. “Really, it’s fine.”

“Are you sure?” asked Bon Bon. “It doesn’t feel like it’s bruised, does it? I could check for you…” rising up on her back hooves, she tugged at the waistband of his pants, pulling downward - but his belt fortunately kept her from actually pulling them past his butt.

“Woah!” he yelped, jerking his body away from her. “I thought Twilight explained to everybody that I’m kind of… particular about being fully clothed.” He turned around, and Bon Bon, for once, didn’t attempt to get behind him. “Besides, even ponies don’t go around yanking each others’ clothes off, do they?”

Bon Bon seemed to be ashamed of her behavior… but there was something else in her body language too. She was trembling, almost vibrating, as if she was struggling to keep something contained. “Sorry, I’m sorry,” she said. “It’s just… I’ve been in sort of a strange mood lately, and, well… could I talk a little more… privately… with you?”

Jake raised a skeptical eyebrow at the request. Bon Bon and he weren’t close friends, so he couldn’t imagine what she wanted to open up to him about. But it didn’t feel right to refuse, either - Ponyville had been good to him, and he wanted to return its kindness. If that meant hearing out Bon Bon’s personal troubles, that wasn’t too high a price to pay. As long as it didn’t make him late to his delivery, anyway.

Bon Bon led Jake around to the back of the restaurant. It wasn’t exactly a secluded spot - Ponyville’s buildings weren’t packed tightly enough to create any dark alleyways - but it was hidden from most sets of prying eyes. “Okay,” he said, “so what’s-”

Bon Bon suddenly leapt at him, knocking him into the back wall of the restaurant- and then with surprising speed and nimbleness, she flipped him around. His face was mashed against the wall, and his ass was jutting out - and Bon Bon was all over his ass, nuzzling her face against the back of his pants. “Bon Bon!” Jake grunted, struggling against the weight of the mare’s body, “What are you doing?”

“I just have to… feel your butt,” moaned Bon Bon. “With my face and my hooves… I need to feel your cheeks without these pants in the way…” she tugged at his jeans again.

“What the hell?” said Jake, trying to throw Bon Bon off without excessive force. “I thought Lyra was the one who was all weird about me!”

“No…” mumbled Bon Bon, running her snout up and down along the crack of Jake’s ass. “She can’t have you, you’re mine, you and your beautiful butt… Take off those stupid pants so I can see all of you, Jake, I want to kiss your bare asscheeks and stick my face in your crack and lick your gorgeous human asshole…”

OK, that was too much. Jake suddenly cared a lot more about getting away from Bon Bon than he did about hurting her feelings. He pushed off the wall, knocking Bon Bon onto her butt, and ran off in the direction of the train station. He still had a job to do, after all; whatever was wrong with Bon Bon, he could deal with it later.

But Bon Bon wasn’t so easily dissuaded. She was chasing him down, wide-eyed, drooling, and shouting after him. “Nooo, come back!” she wailed, easily loud enough for everyone in the vicinity to hear. “I wanna lick your sweet human butthole, Jake!”

And as one might imagine, that attracted the attention of a lot of ponies. Jake, still determined to do his job, had made it to the train platform just as the passengers were disembarking. And so there were a few dozen ponies, mostly mares, turning to look at the pony who wanted to lick a human butthole and the human whose butthole she wanted to lick.

Jake felt his face getting hot. This was humiliating for him, and it was probably even worse for Bon Bon, but as long as he was here he figured he may as well do his job. He looked for the professor he’d been told to make the delivery to, reminding himself of the physical description Twilight had given him. Unicorn, red-orange coat, long yellow mane, cutie mark of a red jewel set in gold. She was easy enough to spot, and Jake rushed over to her, hoping to hand off the vial before Bon Bon made too much of a scene.

“You must be the courier,” said the unicorn. “I’m professor Crimson Shine, and… er, it’s none of my business, but are those mares giving you trouble?”

“Mares? Plural?” asked Jake. He turned around to look at Bon Bon… and saw her, and five other mares, struggling and grappling with one another. They all seemed like they were trying to get closer to Jake, but as soon as one of them made the slightest bit of forward progress, the others pulled them back. And on top of that, all of them were shouting at each other about Jake’s ass, claiming it for their own.

“I have to be honest,” said Jake, turning around to look at Crimson Shine. “I don’t really know what’s going-”

Something about Crimson Shine’s expression made Jake pause. She was staring at Jake with a hungry expression, leaning sideways to look at his backside… and then, without a word, she sparked a flare of orange-hued magic on her horn and magically unzipped his pants.

“What are you doing?” yelped Jake. He grabbed his pants by the waist and held them up, struggling against the unicorn magic that was pulling them down.

“I’m just trying to get a better look at your rump,” said Crimson Shine. “If you let me kiss your bottom and lick your tight little butthole, I’ll give you a very generous tip…”

She managed to get Jake’s pants to the floor, and he jumped out of them, stumbling backward. That got him away from Crimson Shine, but it delivered him right to the mob of mares And that mob had grown: it was now twelve mares, all fighting for the right to kiss Jake’s butthole. And now that Jake himself had fallen right onto their angry pile, that dispute suddenly got a lot more heated. Mares were tugging at his boxer shorts from every direction, with hooves, with magic, or with the tips of their wings.

As he struggled his way through the mob, one mare or another would occasionally get her face right in his butt, nuzzling her way between his cheeks, pressing her snout up against his puckered asshole. Jake was confused and frightened, but he couldn’t help but be stimulated by what was happening to him; he felt his cock growing stiffer as the mares gave his butt more and more attention.

Fortunately for Jake’s modesty, the mares’ complete lack of cooperation made it impossible for any of them to get what they were after. As soon as one mare managed to nuzzle his butt, she was yanked away by two or three jealous mares. They couldn’t even succeed in getting his boxers off - and, ultimately, they couldn’t succeed in holding him down. When the mares that were grabbing his legs were shoved aside, Jake was able to make a break for it, running pantsless in the direction of Twilight’s castle.

Twilight would know what to do. This seemed like a magical problem, and no one was better qualified than her to deal with those. Jake just needed to make it to the castle without getting mobbed… and it looked like he just might manage it. Plenty of ponies in the raging mob were faster than Jake, but they were still fighting viciously amongst themselves, and any mare who got close to him, on land or on air, was promptly tackled by several others. His heart was pounding and his lungs were burning by the time he got to the castle, but he beat the mob to the door. He raised his fist to hammer on the door-

And found himself swinging his fist into empty air, suddenly surrounded by crystal walls. “Hi, Jake,” said the voice of Twilight Sparkle. “Sorry for the surprise teleport, but my proximity spell sensed you at the door and I just hate it when people knock while I’m trying to work.”

“Uh, it’s fine, actually,” said Jake. “Are we in your bedroom?”

“Yeah, I’m just doing some spellwork,” said Twilight. She was seated at her desk, hunched over a stack of papers, not looking up as she scribbled with a pencil held in her magic aura. “You’re much too early for that bringing-takeout-dinner thing I proposed… was there a problem with the delivery?”

“Uh, yeah,” said Jake. “I ran into Bon Bon, and she was acting weird… chasing me… and then a bunch of other mares were chasing me. They weren’t angry, they were just kind of, uh…”

Twilight raised her head from her work. “Were they acting like they… wanted something from you? Something you had?”

“Yeah, kinda... “ said Jake, not entirely comfortable with the prospect of explaining how a mob of mares had been clamoring to lick his butthole. “They stripped off my pants… and…”

“Okay, I see what happened!” said Twilight. She scooted her chair out from her desk and hopped down. “It sounds to me that you broke the vial I gave you, it spilled on your clothes, and a bunch of ponies went crazy over your pants.” She looked at his bare legs, her eyes widening slightly as she saw his cock tenting his boxers.

“Uh… anyway,” she continued, “That vial contained a liquid suspension of what’s known as the “Want It, Need It” spell, which causes ponies to develop an uncontrollable desire for whatever it affects. I was sending it off for study… unfortunately that plan suffered a setback, but the important thing is that you’re all right.” She trotted past him and used her magic to open one of her dresser drawers. “Now let’s get you something else to wear. I know you don’t like just being in your underwear. How about-”

Twilight turned around, and at that moment she finally saw what the other mares had been seeing: Jake’s butt. Instantly, desire rose in her mind, turning into a singular lustful obsession. That butt had to be hers. She needed to kiss those soft human asscheeks and rim that perfect human butthole.

“Or maybe…” said Twilight, “We should strip off those undies so I can get a better look at you.”

“Huh?” said Jake - but before he could react, he felt his boxers getting pulled to the floor. And when Twilight saw his bare butt, her brain practically overheated with desire. She knew she was under the effects of her spell - she recognized the signs - but she didn't care. She didn't want to try and fight it. She just wanted to bury her face in Jake’s asscrack and lick his wonderful human butthole.

Twilight tackled Jake. His knees hit the soft carpet, and then he fell dick-first, lying flat against the floor. “Twilight, what are you doing?” he asked, planting his palms on the floor to lift himself back up.

“I can’t help it,” gasped Twilight. Jake suddenly felt his wrists and ankles get heavy and slam against the floor; when he looked at his hands, he saw rings of purple magic holding his wrists down, exerting more force than his muscles could overcome.

“Jake,” breathed Twilight, nuzzling her soft furry cheek against Jake’s butt, “I’m under the effects of the potion that you spilled on yourself. It made your butt… irresistible…” Jake felt her lips, soft and warm, press themselves against his asscheek and give it a long, tender kiss.

“Okay, that explains… a lot…” said Jake. “Can’t you fight back? Or dispel it?”

“I could,” said Twilight, “But it would be… really hard… and not much fun…” She licked her way up Jake’s crack, making him shudder. “And it would be lots and lots of fun to just lick your beautiful butt until the spell wears off. What’s wrong, doesn’t it feel good?”

“Well, it does feel kind of good,” said Jake - whose cock was standing at full attention, rubbing against the soft carpet as the motions of Twilight’s head gently moved his body back and forth. “But… I don’t want you to be stuck doing something you don’t really want to do.”

“Believe me, Jake, there is nothing I would rather do right now than bury my face as deep in your ass as I can possibly get it,” said Twilight. “But if it makes you feel better, I did already have a crush on you.”

“What?” asked Jake - and then he jerked in surprise as Twilight blew a raspberry on his asscheek and lifted her head, giggling.

“Yeah!” said Twilight. “That’s why I wanted to get you alone tonight! You said you needed a woman in your life, and I thought I saw my opportunity… Without the potion, though, I might not have been this aggressive… or so focused on your perfect, beautiful ass…”

“Wow,” said Jake. “I really had no idea. I mean, I like you too, but this is a lot…”

“If you think that’s a lot,” said Twilight, “Then you’re not prepared for what I’m going to give you next. It’s been taking all my willpower to keep myself from doing this…” She set her hooves on his cheeks and pulled them apart, sighing with bliss as she finally set her eyes on his asshole - then she buried her face in his crack, dragging her tongue over his pucker.

“Woah, woah!” yelped Jake, doing his best to struggled against the magical shackles on his wrists and ankles. “Holy shit, Twilight, I kind of… didn’t think you’d really…”

But Twilight was done talking. Her first taste of Jake’s butthole had gotten her hopelessly addicted; before this moment, her mind and her magic could have resisted the spell, but now she was completely devoted, utterly in love with Jake’s ass. She moaned happily, circling his hole with her tongue, kneading his asscheeks with her hooves.

“Twilight,” groaned Jake, “If you keep doing that… I’m gonna cum…”

If Jake had been trying to dissuade Twilight, that was the wrong thing to say. She pressed her tongue harder against his skin, massaging the sensitive spot with her surprisingly strong mouth muscle. Jake had never realized just how sensitive his asshole was, or how much pleasure it could provide, but Twilight was greedily pleasuring his pucker. If anything, she was getting more out of this than Jake was; she had a desperate need to touch and taste his butt, and every lick just made her want it more.

Jake’s cock was throbbing, twitching, threatening to shoot its load every time Twilight licked his butthole. “Twilight… slow down… I can’t… nnghh-” his body jerked, and he came, shooting his load onto Twilight’s rug in thick, sticky ropes. Twilight didn’t let up for a second, licking his butthole all through his orgasm, mumbling with pleasure while Jake grunted helplessly and spilled his cum. He fell limp, panting, when his climax ended, but Twilight wouldn’t stop.

“Twilight,” gasped Jake, “You have to stop… I just came, I need a break…”

Twilight lifted her head from his asscrack, sighing with satisfaction. “I’m afraid the spell won’t wear off for a few more hours at least,” she said. “But I’d feel terrible if you weren’t enjoying this as much as I am. Hold on, let me try something…” Her horn glowed, and Jake felt her aura embrace his dick and balls. When the spell ended, he felt… different, in a way that he couldn’t quite place…

“There,” said Twilight. “Now you should be able to cum for hours.” She wedged her snout back into Jake’s asscrack, licking his ass with the same lustful energy as before. And Jake, no longer in his refractory period, felt his balls tightening and his cock twitching, readying to fire another load…

---

Jake felt the morning sun on his face and furry limbs wrapped around his chest. When he opened his eyes, he found himself surrounded by crystal walls, and when he looked behind him he saw a purple pony embracing himself with her forelimbs.

He realized that the events of the previous afternoon - and the previous night - hadn’t been a dream. He started to wriggle out of Twilight’s forelegs, trying not to wake her up; for all he knew, she’d hold him down and lick his ass for hours if he roused her.

Before he made much progress, though, Twilight mumbled and pulled him towards her, holding him in a tighter embrace. “Good morning,” she whispered, resting her head against the back of his neck.

“Uh, hey, Twilight,” said Jake. “Are you… feeling okay?”

“I’m feeling good,” said Twilight. “Maybe a little embarrassed about how I acted last night… but it’s nice to wake up next to a handsome human.”

“So… the potion wore off?” asked Jake.

“Yeah,” said Twilight. “Although the liquid form of the spell is sort of untested, so there might be some lingering effects… we’ll just have to see.”

“What sort of lingering effects?” asked Jake.

“Oh, probably nothing too weird,” said Twilight, releasing Jake from her embrace. “Here, I’ll let you start your day… once I give you your good-morning kiss…”

Jake felt two hooves parting his asscheeks, and Twilight’s snout digging its way into his crack - but instead of a full-on rimming, Twilight just planted a tender kiss on his butthole. “Good morning, Jakey,” she said, her whispering voice tickling his pucker.