Christmas break.
 
As the winter winds howled outside, Hogwarts castle stood largely empty, with most of its students having returned home for the holidays to spend time with their families. One exception was Hermione Granger.
 
Ever the studious type, Hermione had elected to remain at Hogwarts in order to practice a new spell of her own creation. Genuine spellcrafting was typically the domain of much more experienced witches and wizards, but Hermione had always demonstrated abilities beyond her peers and felt that if any student was capable of crafting an original use of magic, it was her.
 
“Suctio ventus.”
 
A spark emerged from the tip of Hermione’s wand and left a scorchmark on the column of Pavarti’s bed. Its owner, thankfully, was not around to complain. All of the Gryffindor girls in Hermione’s year had gone home, meaning that she had the dormitory all to herself.
 
“Suctio ventus.”
 
She spoke more firmly this time, imbuing the magic with her intent, willing it to make real her designs. When nothing happened, she grew frustrated, impatient, and ready to call it quits for the night. This was supposed to work. As far as she knew, she’d done everything right. Why then was the charm not working?
 
For the next hour, Hermione poured over Amorette Deneuve’s Charms from the Ether in search of something she might have missed. Nothing. After everything, she came up empty handed. Hermione was usually quite a composed person, but when hitting an academic brick wall, she had a tendency to lose her cool. Frustrated, she tossed the useless book behind her as she sat up on her bed, grabbed her wand, and went in for one last attempt.
 
“Suctio ventus!”
 
Hermione knew she was finally on to something when the bedposts began to shake and dust started to fall from the ceiling. That was a promising sign, but bringing about an earthquake wasn’t the purpose of the spell. For that, Hermione needed only to wait a moment longer as, behind her, right in her blind spot, Armorette Deneuve’s tome levitated off the bedsheets, hovered briefly in place, then shot right up her arse with a tremendous force, ripping straight through her skirt and stretching her rectum to accommodate its entry as she winced, hurrying to nurse her backside while the spellcrafting manual came to a rest in her bowels.
Not wanting to pay Madame Pomfrey a very embarrassing visit, Hermione decided to gingerly lay herself down and hope that natural processes would take care of the book as she thought back on what happened.
 
Naturally, cramming a literary work up her Chamber of Secrets was not what Hermione had set out to do. The spell was simply supposed to be a more powerful variant of a summoning charm, but what had she summoned? The book? This needed further study.
 
Thankfully, Hermione was spared the indignity of a night in the Hospital Wing as the slime in her rectum broke down the charm’s handbook into a much more manageable pulp. Come morning, she managed to empty herself without a problem, but her bathroom visit was prolonged all the same, for its quiet afforded her the perfect place to think upon the spell and its unexpected effect on her.
 
Most witches, when something large and hard made an unplanned entry through their backdoor, would likely try to avoid the experience in future – but not Hermione. Her mind was busy thinking of what had happened and how she might smooth out the wrinkles. The spell worked. Now all she needed to figure out was how.
Naturally, being the most gifted witch of her age, Hermione didn’t take long to find answers to her questions. The key to a consistent result was where she cast the spell. Where most charms relied on a specific wand motion, this one seemed to depend on physical contact, almost as if it was creating a point of attraction not entirely dissimilar to Muggle magnets. To test this, Hermione locked herself up in one of the toilet stalls and whispered the incantation while tapping her bare bum with her wand. On an entirely academic level, she couldn’t say she was surprised when the toilet roll shot right up her pooper, but it did elicit a loud moan all the same. Thankfully she was in the bathroom and could pass off the noise as dealing with a particularly troublesome stool. As embarrassing as it might have been, it wasn’t quite as bad as the alternative.
 
After several days testing her theories (and having the bloated midsection to prove it), Hermione at last decided that she couldn’t keep this to herself. But who could she share this with? It couldn’t be Professor McGonagall. Hermione respected the head of Gryffindor house too much to bother her with something so.... perverted. The same could be said for any of the teachers, really. No. She needed someone that she knew. Someone she could relate to. Someone like....
Ginny Weasley led the procession. She didn’t normally like to cut quidditch practice short just to go the bathroom, but then it wasn’t every day that Hermione asked for a favor. With her came Luna Lovegood and Cho Chang – both at Hermione’s request – each as confused as she was to be summoned to the second floor toilets this early in the morning.
 
On arrival, they were greeted by a rather flustered-looking Hermione. Her bushy hair was somehow bushier, and her usually pale complexion was brushed with a hint of red across her cheeks.
 
“You made it.” She breathed a deep sigh of relief. “I wasn’t sure you’d come. I placed a few obfuscation charms around the door, so I couldn’t hear you coming.”
 
“Sounds important.” Luna remarked dreamily. “I wonder what this is all about.”
 
“I’ve been thinking that myself.” Ginny added.
 
Faced with the moment which she had invited upon herself, Hermione got to explaining; going into great detail about her experiments thus far and everything she’d since discovered about her new favorite spell.
 
“So it attracts things to your...?” Cho awkwardly trailed off.
 
Hermione nodded. She couldn’t quite bring herself to say the words. This was already far more embarrassing than she anticipated. She just had to push through.
 
“I don’t understand.” Luna said with never a truer word. “This is all very interesting and all, but why do you need us? If it were me, this might be the sort of thing I keep to myself.”
 
Another blush crossed Hermione’s face. It was a fair point. Truthfully, she didn’t strictly need the others. She wanted them. To discover something like this and not share it seemed like nothing less than a crime against magic.
 
“Well, um....” She stammered, not sure how to say it. “You see I.... The thing is....”
 
“Oh, just spit it out already!” Ginny said bluntly.
 
You could always count on Ginny to cut through the nonsense. Hermione almost smiled at her straight-forward nature. Alright, she could do this.
 
“Okay, please don’t judge me for this....” Hermione squealed. “But you know how I said I’ve been sucking things up my b-bum? Well, it wasn’t just for practice. If I’m honest, the feeling is really quite exciting. Here, let me show you.”
 
Without waiting for a response, Hermione brought the tip of her wand to her cheeks, cast “Suctio ventus”, and moaned unashamedly as the spell latched onto a toilet brush, a plunger, and someone’s abandoned homework, sucking them all into her arse one after the other. Her body jolted with each entry, and with them came a trio of sensual groans that she couldn’t have held back even if she wanted to. This was all just so intense. Embarrassing too. But then, she wasn’t the only person enjoying themselves.
 
“Ginny?” Cho sounded taken aback, catching her friend in the act just as the redhead was delving into her skirt.
 
“What!?” Ginny sounded flustered. “She’s obviously turned on by this. Why should she have all the fun?”
 
To that, Cho had no answer. Hermione had nothing to say either. She was too busy milking the sensation in her butt for all it was worth. The only person not speechless was Luna – but that was only because she was going off again about one of her imaginary creatures.
 
“You know, it reminds me of the wide-mawed gurglepuff.” She said, moving around Hermione to get a better look at her vacuous backside. “They’re predators that look misleadingly small and cute, but when you get near they-”
 
No one would find out what it was the gurglepuffs did, for in a move that was very typically Luna, she had reached out her hand to touch Hermione’s bottom and accidentally got it caught in the suck-zone. In an instant she was elbow deep in Hermione’s arse; pulling against a force she had no real chance against. She yelped, alerting the others to her plight. Ginny and Cho rushed to her side. Hermione, however, was rooted to the spot, locked in a tug of war against the blonde Ravenclaw whether she wanted it or not.
 
“Hermione, you’re sucking her in!” Cho exclaimed, grabbing Luna’s left shoulder as Ginny took the other. “Come on, Luna! Just hold on!”
 
But she couldn’t.
 
Luna, not exactly known for her strength, was quickly losing ground to the ravenous hole in front of her. It suckled along her sleeve, eating her arm as if it was slurping on a boiled sweet. Cho and Ginny had to let go or risk getting caught themselves; surrendering Luna to fate as Hermione’s hole reached her shoulder.  
 
Though her audible moans might have given another impression, Hermione was hardly unaware that she was anally devouring a fellow student. She just didn’t care. Or rather, she couldn’t care. Having something as large as Luna Lovegood entering her ass overrode any sense of compassion she might have had. Luna was just an object. A really pleasing, extremely stimulating object. Right now, feeding her arse was all that mattered.
 
From there, her ass got hungrier, gaping wider to admit the blonde’s head and consuming it when the chance arose. Poor Luna. She might have stood a chance if it was only the spell she was facing, but when Hermione herself got in on the action – bending over, reaching back, and spreading her cheeks wide – it was over. The rest of Luna was yanked in with a wet pop, drawing her into a world of stink and disgusting mucus. She gave a parting yelp before the wrinkled hole closed behind her feet, trapping her inside with the rest of the stink.
 
As a meal, Luna made for a surprising lack of baggage. Hermione had no trouble at all sitting back up and patting her backside on a job well done. If anything, the only difficulty came from her friends who, quite understandably, weren’t exactly thrilled that she’d so nonchalantly eaten one of them with her butt.
 
“Let her out!” Cho cried, seizing Hermione by the shoulders and shaking her as if doing so might make Luna tumble free.
 
“Stop....” Hermione groaned, nursing her stomach and the disturbance within. She didn’t mind Cho’s reaction – that was fair enough – but all this shaking was riling up something inside her. “I have gas.”
 
She said it so plainly and innocently. It was a disservice, really, to the wind kicking up a storm in her gut. It felt tight. Bloated. All of the things stuffed up her ass put together couldn’t compare to this pressure. Her discomfort didn’t matter to Cho. The Ravenclaw just wanted her friend back. Hermione, however, only had one thing she could release.
 
PPPHHHLLRRRRPPPPTTTTT!!!!!!!!
 
The look on Cho’s face as Hermione erupted with an explosion of rancid gas was nothing short of priceless. It was as if her eyebrows raised as Hermione’s gas depleted, disappearing into her fringe the longer the fart went on.
 
And on it went. Hermione didn’t stop farting for a good minute or so, by which time she was exhausted and the room reeked worse than it ever had in its 1000-year history. The question then became why. She’d entertained half a dormitory's worth of furnishing up her butt by now, so why was this fart so long and stinky? Then it hit her.
 
“Ugh.... I think that’s Luna....”
 
It made the most logical sense; Luna Lovegood digested into flatulence. There were notes of radish among the general egginess of the lingering fart smell. That was Luna alright, but oddly Hermione didn’t
 
feel regret for turning a friend into a fart. It was satisfying, if anything. And was her bum looking a little bigger?
 
“What is wrong with you!?” Cho looked betrayed. “That’s Luna? You just ate her and you’re acting like it’s nothing. This is.... Ugh! Ginny, say something!”
 
Attention turned to the redhead who, Hermione noted, was being uncharacteristically quiet. Ginny stood off to the side, hands fidgety, a blush on her face as she avoided eye contact with either of them. Cho called her name again, prompting her to snap out of it.
 
“Oh, umm....” Ginny stammered, more nervous than Hermione had ever seen her. “It’s just, what happened to Luna.... That was kind of uh, a turn on?”
 
Somehow, Ginny’s embarrassing admission stunned the room even more than Hermione’s fart. The girl’s face reddened so much, but through Cho’s judgmental glare she looked to Hermione, summoning the courage to speak.
 
“You could do that again, right?” She asked nervously. “If you had another person?”
 
Hermione nodded. In that moment, Cho knew she was in trouble. She reached for her wand to defend herself, but Ginny was always the faster duelist. With a swish and a flick, Ginny caught Cho with the leg-locker curse, magically binding her legs together and making her easy prey for two fully-mobile girls; one of which had an arse that needed filling.
 
Ignoring her protests and pointless pleading, Ginny grabbed Cho and dragged her across the floor of the bathroom, an excited fire in her eyes as she took the girl’s frozen feet and held them up to Hermione’s backdoor, pushing Cho’s toes against it as if knocking for entry.
 
So far, none of this was turning out as she thought it would. Hermione never had any intention of subjecting a friend to her ass, much less enjoy it as much as she did. And she certainly didn’t expect to have them fed to her. For once, Hermione didn’t even try to think about it. She didn’t need to understand what Ginny was doing. In there here and now, the only thing she wanted was more stuff up her butt.
 
“Suctio ventus!”
 
The magic coursed from wand-tip to butt cheek, restarting the inhalation of Hermione’s asshole and giving it the power to latch on to the nearest object. Ginny held Cho’s feet up, tempting the vortex of Hermione’s butt to catch it and, when it did, pull them deep into her ravenous sphincter. At first, consuming Cho was no different than a lifeless object, but then Hermione reached the girl’s hips and met her first real obstacle.
 
“Why didn’t you just –hngh!- stun her?” She wheezed, straining to overcome the girl’s arse.
 
“I though having her squirm would be more fun.” Ginny answered simply.
 
Hermione never realized how much of a sadist Ginny could be. It surprised her almost as much as her own emerging sadistic tendencies because Ginny was right – having Cho wriggle around was way more fun.
 
As futile as it may be, Cho kept up her struggles until the very end, screaming for help when Hermione overcame her ass and then breaking down into unintelligible mumbles when she was engulfed up to her boobs. Hermione made sure to enjoy sucking in those, but the spell wasn’t just going to wait around for her to have her fun. With another pull the only thing left sticking out between her cheeks was Cho’s head. Hermione clenched. The magic dissipated with one last suck, absorbing Cho in her entirety and leaving Hermione with a very special parting gift.
 
Cho wasn’t even in Hermione’s arse for 10 seconds before she was digested. Earlier, when Luna dissolved, Hermione had thought that her bum had gotten a little larger. But now, after Cho, she had to wonder no longer. The Ravenclaw added to her ass in a big way, bumping up those buns to give her the fattest arse in Hogwarts. After all this was said and done, a change in uniform was certainly in order.
 
BBBBBBBLLLLOOOOOORRRRBBBBTTTTTTT!!!!!!!!!!!!!!!
 
With no warning, Hermione’s expanded rear ripped a deafening fart right in Ginny’s face. The green gas blew the redhead’s hair back and caused the entire bathroom to shake, but through it all Ginny stood with her hand down her pants and her nose sniffing the air.
 
“So good....” She drooled, abandoning all reservations as she dropped to all-fours and pressed her face against Hermione’s ass for a closer sniff.
 
In her lust, Ginny wasn’t thinking straight. She was acting on impulse, driven by desire. She loved Hermione’s girl gas, but that love had put her in possibly the most dangerous place in the entire school.
 
“Suctio ventus!”
 
Hermione couldn’t let this opportunity pass her by. One second Ginny was enjoying the smell, and the next she was swimming in it. Her head popped right in, swallowed by Hermione’s anus and trapped, stink engulfing her every sense. The stench brought her back to reality. This was a closer look at Hermione’s bottom than even she wanted, but with the butthole closed around her neck and the magic exerting its influence upon her, Ginny’s struggles came too little, too late.
 
Blessed with her now Luna and Cho-infused cheeks, Hermione had no trouble at all slurping the younger Gryffindor up, swallowing Ginny in four even gulps that each took a brief pitstop to let Hermione enjoy what she could. She moaned at the shoulders, yelped at the breasts, then positively wailed when she ate up Ginny’s butt. The girl’s legs were a victory lap after that. Hermione relished every inch of swallowing them. When she was done, and Ginny faded into gas, she climaxed in sync with the growth of her arse. Her cheeks got so bubbly and big that they looked like they’d been hit with an engorgement charm. How she would explain that she had no idea, but as she felt her gut fill, she hoped she might not have to.
 
PPPPPPPPPPPPPPPPPHHHHHHHHHHHHHHHLLLLLLLLLLLLLLRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRPPPPPPPPPTTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
Ginny was the windiest and smelliest fart yet. Her exit left Hermione’s cheeks in a rhythmic jiggle and created a miasma of stink that filled the bathroom. It was great. Amazing, really. But in farting such a huge gas cloud, Hermione felt strangely empty. Hollow. She needed something to plug up the absence in her bum, but she was out of friends to turn into farts. What else could satisfy her like they did?
 
The answer came to her when she looked around and caught sight of her reflection in one of the bathroom mirrors. If she wanted to be truly filled, then there was really only one candidate fit for the job.
 
Hermione, gripped by desire, made the decision then and there to suck herself up her own ass. Forget tests. Forget her future. She wanted this. Nothing else.
 
It was almost like she was prophesized to do this. Under normal circumstances she’d never have been able to pull it off, but thanks to her massively enlarged posterior, half the work was already done. The rest was simply magic.
 
"Suctio ventus maxima!”
 
Hermione cast the enhanced spell upon her butt, granting it a level of suction that previously she’d deemed dangerous, yet now it was exactly what she needed. With it, her arse effortlessly hoovered up the gas floating around the place. Then it set its hunger on a new target – her – the suction clawing for her hair in a bid to satisfy itself. Fighting her every instinct, she jumped up, abandoned preservation, and let the magic bend her body backwards.
 
Hermione’s world went dark as her head went up her own ass. The intrusion caused her to fart in her own face, but for once it was windier her outside. This loop of eat and be eaten created a vortex out of her body. It spun, growing faster, whirring, warping her form as if she were apparating. In this case, there was only one destination she had in mind.
 
The looped figure of Hermione Granger became a blur of motion. With every spin she grew smaller, shrinking in on herself until, with a boom that shattered every porcelain fixture around, she imploded in a cloud of fart gas.
 
It wasn’t how Hermione planned to leave her mark, but she wasn’t complaining. Wherever she may be, she was happy, content, and gassy forevermore.