Sweetie Belle has EHIS.

Sweetie Belle whimpered as she felt her bowels loosening and a foul smell adding itself to the current noxious odour of her bedroom. The smell sent her into a coughing fit.

"Rarity, ummm..." Sweetie Belle croaked,raising her hoof up weakly, slowly shifting around under the heavy covers of her bed which felt as heavy as a sheet of lead around her body.

The filly heard a disgusting squish sound coming from her lower parts, feeling a warm sensation all over her diaper. Rarity entered, but what a sight she was. Her mane was messed up and she had bags under her eyes reddened by tiredness and stress. She walked inside, her horn creating a weak light that allowed Rarity and Sweetie Belle to see in the otherwise total darkness of Sweetie Belle’s bedroom.

"I had to go... again." Sweetie Belle said, blushing softly, not quite used to the idea of wearing diapers to bed. Rarity sighed as she left the room, only to return a few moments later with some wipes, powder and a fresh diaper which Rarity put at the bed’s free end before rolling the covers away, making Sweetie Belle shiver due to the chills..

Rarity inflated her cheeks and held her breath. She untaped Sweetie's diaper, wiping the mess and the urine clean from the filly's nether regions thoroughly and with a grace the mare was known for, before throwing the smelly old diaper away and taking the new one she had brought in. She unfolded it after powdering up her sister’s crotch sliding the diaper under Sweetie Belle's rump.

"Um... Rarity, may I ask you something?" Sweetie Belle asked, her raspy voice mixing with a squeak as her sister proceeded to tape up her diaper.

"Yes, Sweetie Belle?" Rarity asked with a sigh as she crumpled the used diaper and the wipes in a single smelly sphere and then tossed it outside the door with her magic.

"You look tired... really tired. I don't want to bother you with-..." Sweetie Belle went into a small coughing fit after she said this.

"What are you suggesting? Letting you go around the house? Forget it," Rarity said with a groan in the attempt to read her sister’s mind. “I simply can’t let you do that while you are still this sick!”

"N-no... I just wanted to say... can't you try to take a break from me, and maybe let somepony else care of me?" Sweetie coughed, slowly lowering her head to avert Rarity’s gaze.

"And who would do that?” she snapped. “The doctor has come in once already, and he said that all you needed was bed rest and near-absolute immobility. Who else would do this for a reasonable price? Better yet, who would do that at all here in Ponyville? There aren’t many nurses for hire here.”

Sweetie Belle sighed, looking at the ceiling, her sister and back before an idea struck her.

"Well… maybe Doctor Stable's son... his special talent IS being extremely resistant to illness… I mean..." Sweetie Belle went in yet another coughing fit, "his father says that he's so resistant, he almost can’t come down with anything… and he said he wanted to start to use his talent somehow… maybe he'd look after me if you ask..."

Rarity rolled the covers back onto Sweetie Belle, forcing her to lay down again. She mumbled to herself for a bit, putting her hoof under her chin, her face contracted in what looked like, in the dim light of the bedroom, a tense frown.

“I’m not sure about him…” Rarity said. “How about we do this. We will call him in three days if you don’t get better, alright?”

Sweetie Belle sighed, sinking back in her bed. "Okay..."

And with this, Rarity walked away, left the room, and, closing the door behind with a sigh, she went to throw away the used diaper and wipes. As the clicking sound of her hooves walking on the floor faded, Sweetie Belle looked at the ceiling.

“What was up with her? Sure, she’s tired, but… she looked quite unsure when she spoke about him and about the doctor’s diagnosis…” Sweetie Belle thought as she coughed again “Or maybe I’ve imagined it.”

Another couple of days had passed, and Sweetie Belle still didn't feel well enough to get up, nor she was seemingly anywhere close to being cured.

After another doctor's visit whose result was kept hidden to Sweetie Belle, Rarity had hired Doctor Stable's son, called Iron Health. Sweetie Belle just hoped that he could help her recover from her illness as quickly as possible.

"Ah, you must be Sweetie Belle," a dark gray stallion with white spots on his chest said as he walked inside Sweetie Belle's bedroom, the floor shaking at every step, his voice deep and echoing despite his somewhat skinny physique. His black mane was long and ratty. He also sported an unkempt beard and apparently had a tongue bigger than his mouth since it hung somewhat loosely from his mouth.

Squeaking, Sweetie Belle mustered all the strength in her body, covered and wrapped herself in her covers until only her mane and her eyes were visible, shaking even without the aid of Iron's extremely heavy steps, accompanied by her heart beating like a regimental drum in her ears.

Once he was next to her, he lowered his face towards Sweetie's until his muzzle pressed against hers.

"Tell me, sweet little filly," Iron Health said, his warm breath, much to Sweetie's surprise, smelling of lavender, "where, and how much does it hurt? Tell me, how many times do you go? Tell me about all your excretions... all of them."

Sweetie Belle still quaked and shivered as her weakened bladder, thanks to the current sense of uneasiness and fear she was feeling, failed to do its job, making Sweetie wet herself with a hiss coming from under the covers.

"Um... my throat hurts a lot... my hooves feel as if they were made of air, and so does my head... my," Sweetie Belle blushed, "privates... are swollen, reddened and make a weird icky, sticky thingie when I pee. My pee is also pretty dark-colored, and it hurts a little bit to go..."

Iron Health turned face away, hummed and nodded as he slowly stroked his beard.

To Sweetie Belle, his hum wasn't something that belonged to a skinny pony, no matter how ground-shaking his steps were, but more to somebody the likes of Tirek or Discord’s father, thus fueling her uneasiness even further.

"Would you mind if I were to take a look?" He asked, slowly moving away the covers, which caused Sweetie Belle to curl up immediately.

"P-please... be quick." Sweetie Belle said, shivering, both due to the fear and the cold, and blushing furiously at the idea of being seen in such an exposed position.

Iron Health nodded, as he swiftly untaped Sweetie Belle's diaper. The filly shivered harder, as a gust of cold wind hit her wet and itching genitalia. He moved closer to the swollen labia and delicately brushed his left hoof inside it, causing Sweetie Belle to gasp, and his hoof to be covered in a white, cottage cheese-like substance coming out of Sweetie’s genitals.

Iron Health tasted the substance with his tongue, just before rubbing the excess away on the bed and going back to look down at Sweetie's nether regions, which made Sweetie Belle feel sick to her stomach. Seemingly unaware, he quickly poked her swollen labia, causing her to squeak.

"Well, well, well..." Iron Health said as he then taped the diaper back on and put the covers back on Sweetie Belle, making her sigh in relief as warmth returned to her nether regions. "We have one nasty case of EHIS."

Sweetie Belle quivered her lip and looked up at him worriedly.

"W-what is that? Is it bad?"

He chuckled then patted her head, and she squirmed due to it.

"No, it's not all that bad, just a bit annoying, a lot of fillies stumble upon it too," he said. "See, when you grow up, your privates start to have another function, besides peeing. They are also used for having foals, if the time of the year is right."

Sweetie Belle winced and still shivered while he explained. She remembered the time when Rarity had explained to her what a "heat cycle" was. She was still shaken by it, but she was also somewhat glad that it didn’t have only that function.

"However, sometimes the growth isn't harmonious, which can lead to a situation where you are in heat, but at the wrong time and without the rest of your body being able to take it, which causes your body's immune system to react and, in turn, your magic to attempt everything to clean off whatever non-existent sickness has stricken your lower parts."

Sweetie Belle gulped, quickly grasping the implications.

"And this means... doing that?"

"Well, yes,” he explained after he shrugged. “You could stay in bed and wait for the sickness to end with the season, but I think that finding a cute colt to be intimate with for just a hour and be done with it might be a lot better. But now let me take something to drink."

With this, Iron Health walked towards the door. Sweetie Belle put her left hoof under her chin and frowned.

"But who? I'd like to have Pipsqueak with me, but I don't think he would like to see me in a diaper. Rumble didn't know that fillies and colts are different down there until a month ago, so I doubt he could work. Featherweight is just... ick. I could try Archer, since he says to have done that a lot..."

As she thought that, her lower body hurt and, suddenly, she released her bowels and stained her bed, making her whimper and lose her train of thought.

"Um, Iron Health..." Sweetie Belle tried to shout, only to croak like a frog "I messed the bed… please come quickly..."

“Let’s see… Archer is out of town, Truffle Shuffle is a slob and I don’t want him to give me another bug, same for Snails, Snip cannot tell apart his own from a maggot, Button said he’s too busy for the next week…” Sweetie Belle muttered to herself, looking straight in front of her as she enjoyed the sensation the cream applied by Iron Health provided to her aching lower parts “So, there are no colts left for me. Big Macintosh… that’d be a little scary to try, and doing it with one of my friends’ brother would be weird. Spike is a dragon, not a pony, I don’t know any stallion that’d do it and at the same time I wouldn’t mind…”

Sweetie Belle coughed loudly, which made the door squeak as Iron Health opened it.

“Do you need a tissue?” Iron Health asked, peering out from the door, a box of the aforementioned tissues in his mane. Sweetie Belle shook her left sideways hoof towards him.

“No thanks…” She said, and he nodded, while turning.

“Do you want something to drink? Some juice maybe?” he asked “Or would you rather have a snack?”

Sweetie Belle wasted little time in thinking about it.

“G-grapefruit juice a-and an orange… please.” She said.

“As you wish!” He said, as he then trotted off down the stairs, the floor shaking pretty violently as he did so. As she was rocked by the vibration, Sweetie’s mind slowly tried to get back on her train of thought.

“I’ve lost the entire day thinking about this…” Sweetie Belle muttered to herself “Maybe I should settle for one of the colts, or just wait this out. Then again, this means stay in bed for Celestia knows how long, with nothing to do but mope, eat, read and use diapers…” She made a face at that last fact.

She froze, as something dawned on her, about her current predicament. Better yet, on its solution.

“Iron Health!” She exclaimed with a croak “He’s the perfect stallion for this. Not too ugly, not bothered by my situation, not overly creepy, I know him…”

Sweetie Belle nodded to herself with a little smile.

“He may look scary, but I’m sure he’ll go gentle with me.” She whispered to herself. The floor started to violently shake again.

“Juice and oranges, coming right up!” Iron Health declared from the end of the corridor, allowing Sweetie Belle to slowly shift around towards the door. He came in with a tray made of wicker, a jug full of the reddish orange liquid, an empty green glass and an entire peeled orange on a white dish.

She blushed, as, still making the ground quake, put the tray on her bedside table, after moving away the pile of book there to make room for the tray. Sweetie Belle grabbed one of the orange’s slices, while Iron Health filled the glass with grapefruit juice.

After taking a nibble on the orange and having felt the acidic taste on her mouth, Sweetie Belle sighed.

"Um, Iron..." Sweetie Belle said with her currently feeble voice

"Yes, Sweetie Belle?" He asked, while he filled up the glass to the edge of it.

"I... I have s-something to tell you..." She said, just before shriveling up due to having taken a big bite off the slice of orange, in turn making her put it back on the small plate.

"What is it? Is it about whether to wait or have an intimate relation with a colt?" He asked, as he put the glass down on the tray. Sweetie Belle nodded.

"I-I chose..." Sweetie Belle blushed, as she thought about Iron Health's reaction "you, to give me that cure."

Iron Health chuckled, as he gripped on the covers of Sweetie Belle’s bed, making her already shiver for the cold.

"That will be no trouble at all. Do you want to do it now, or after you have your snack?” Iron Health asked, looking completely unfazed by Sweetie's request, which made her recoil and fold her ears against her head, before temptatively taking another slice of orange to nibble on.

“I-I think that having a snack would help…” she said, as she resisted the temptation to gag at the fruit’s taste, as she swallowed the small bite she took. Iron Health grinned.

“Okay, as you want, I’ll wait here.” He said, as he stepped away from the bed and outside the bedroom, shaking everything in the room and making Sweetie Belle drop the slice of orange she was holding, causing her to sigh and grab another.

After around five minutes of eating, Sweetie Belle grabbed the glass and, holding the glass shakily, slowly gulped the juice down her throat, making shudder by the tartness just before leaving a sweet aftertaste, one that made Sweetie Belle let out a little squeak of pleasure, as she kept the glass in her shaky grip.

“Okay…” Sweetie Belle said with a gulp, as she then set the glass onto the tray “I’m ready.”

“Very good!” Iron Health said, as he walked back in towards Sweetie’s bed.

“Now, technically there are four ways to go to have sex," he said, while he grabbed the hems of the covers and pulled them way, making the filly shiver due to the cold “But, since you are in heat, one of them is excluded, as I don't have any condoms and I doubt you want to become a mommy this early they are three.”

Sweetie Belle nodded weakly. To be honest, she would have liked to have a baby pony to take care of, but the idea of actually being pregnant was... scary, to say the least.

He untaped Sweetie Belle's diaper, exposing her swollen, cream-smeared, red labia to the cold air of the bedroom.

"So, we can do this in three ways. I can lick your kitty, you can suck my dong or I can penetrate your butt." He jumped on the bed, making it quake a fair bit and almost displacing Sweetie Belle out of her spot "Which one do you prefer?"

Sweetie Belle curled up a little, as she quickly thought about which one she preferred.

“My kitty is still itchy, maybe getting it licked would make me feel better… but what if I expel that icky stuff in his mouth? He wouldn’t like that for sure. Up my butt? I poop from there! Maybe I could suck his weenie could work, but…. I dunno, I don’t feel tempted, it just sounds filthy.” She thought, her head lowered “That leaves me with no choice… but I don’t want to stay in bed for so long, and I wanted to try that out anyways.”

Iron Health made circles with his left hooves on Sweetie Belle's tummy, which made her giggle weakly while she thought about which sexual act she liked the sound of, trying not to look unnerved by it all.

Several minutes passed, Sweetie Belle still cautiously thinking about each and every possibility available, until Iron Health shrugged.

"We can do all of the above, if you want. I have the strength. That, or I can choose for you." He said, as he slowly moved his right hoof down to Sweetie's privates, and his penis visibly came out of his sheath. Sweetie Belle blushed strongly, nodding..

"A-as you want… you know this better than me..." she said.

Iron Health then carefully took Sweetie Belle up, and flipped her around on her belly carefully and lifted her tail up to reveal Sweetie Belle’s flushed and reddened fillyhood and her asshole.

"Here it comes." He said, brushing his dick against the rim of her butthole, which sent a shiver down Sweetie’s spine and made her blush and expel a squeaking sound. Sweetie Belle slowly but surely retracted her hooves, as she braced herself for what she assumed it was going to be painful impact. To her surprise, she felt Iron Health's cock going slowly up her butt, causing an uncomfortable and yet pleasant sensation made made Sweetie Belle lower her ears, as her lower parts felt tingling.

She let out a moan as Iron Health pushed in further a couple of times, something that numbed down the uncomfortableness she was feeling due to his penis, replaced with a vague appreciation of it.

He slowly pulled it out with a moan of pleasure synchronized with Sweetie Belle’s, before going back in again deeper and harder. Sweetie Belle’s legs twitched, as did her ears, as she bit her lip so to not moan, while feeling energy slowly but surely creeping all over hear.

“Uh-hu, this feels really funny… I feel a bit stronger and… something else..” Sweetie Belle muttered to herself, as Iron Health let out a grunt, while pulling out and pushing inside again, making her squeal in appreciation as she felt herself suddenly go. Sweetie Belle blushed until she was beet red, embarrassed by the accident she just had. And the fact that she was feeling getting better and better at each thrust, her throat stopping to hurt and her legs having enough strength to sustain themselves and her body, quickly overshadowed Sweetie’s urine leak.

"Do you like it?" Iron Health whispered, his voice deeper and slower and his breath more bathed than his usual, as he kept pushing and pulling out slowly, his penis producing precum that leaked out of Sweetie Belle's butthole, which brought Sweetie Belle to blush, squeak and moan, all at the same time, as her tender ass got accustomed to the sensation.

“Yes… so much…” Sweetie Belle squeaked, as she felt Iron pushing further in.

“Peed yourself?” He said, completing her sentence “Oh, don’t you worry, little filly, it happens all the time. It’s just your body’s current replacement for the proper secretion.”

Sweetie just grinned and nodded and went back to enjoying Iron Health’s thrusts.

Soon, there was a guttural sound coming from Iron Health as he suddenly stopped pushing, which brought Sweetie Belle to snap her head around, only to see him biting his lip and a frown on his face.

“First load… go!” He shouted loudly, making everything in the room quake somewhat and making Sweetie cower a little, just before feeling something warm begin shot up in her anal cavity and Iron Health recoiling a little at each new warm shot. The warmth spread quickly all over Sweetie Belle, and made her shriek in ecstasy, as she herself expelled the weird white and viscous substance from her pussy at the same time, all of that hitting the already soaked diaper's padding below.

Iron Health pulled his penis out with a satisfied groan. Sweetie Belle turned her head around with ease, and she saw that Iron Health’s cock was still hard and somewhat frothing with cum.

"Do you want to suck my penis?" He asked, winking “I still have a lot to give ~”

Sweetie Belle panted lightly, as she turned around slowly, her limbs barely aching at this point and her head vaguely hurting, instead of feeling like a pressure pot ready to explode.

“Yes, I can try that…” Sweetie Belle said, her voice almost imperceptibly hoarse, as she faced Iron Health’s erect cock, before opening up her mouth wide. He grinned, as he then slowly inserted his rod inside Sweetie's mouth slowly, moaning as it brushed against her teeth.

She was feeling the need to gag and push his rod out, but, at the same time, she wished to let it slide over her tongue in her throat, so that she could try out the sensation. In doing this, Sweetie Belle instinctively grabbed Iron Health’s sheath with her front hooves and clung on it, as his cock went past her uvula, causing him to moan and bite his lip and her to let out a muffled whimper of appreciation.

“Come on, suck it∼” He sing-sang after a brief pause, the shrillness starkly contrasting to his previous voice. Sweetie Belle unsurely tried to inhale air just like when she drunk from a straw. Iron Health started to quake in an increasingly intense way, as Sweetie Belle kept sucking. He moaned, then, all of the sudden, with a loud howl of pleasure, he came, sending the salty, warm life’s seed down Sweetie’s throat into her stomach, making her lower her ears, blush and whimper, as she paused to let the fluid go down inside her and enjoy the vague sensation going up her spine and giving her enjoyable tingling.

Iron Health let out a sigh, as he pulled out slowly.

“That was… fun.” He said, panting and chuckling at the same time “Now, how do you feel now, Sweetie?”

Sweetie Belle, after spitting on the floor a couple of times, tried to get up on her hooves. Much to her surprise, she did it quickly and swiftly, and without her head aching or her lower body sending surges of pain or even discomfort.

Sweetie Belle started to trot into place and giggle. Iron Health chuckled.

“I take you’re well now!” He said with a chuckle.

“Thank you very much, Iron Health! Thank you so much!” Sweetie Belle squeaked, as she jumped to hug him and kiss him on the cheek, causing him to blush.

When Rarity came back, Sweetie Belle decided to get up and trot towards her to greet her and prove she was healthy again.

"Hello Rarity!" Sweetie Belle chirped like never before, her butt still wet with the water she used to clean up after the mess Iron Health had left behind.

"Oh, hello Sweetie Belle, I see you are feeling better already. What did he do?" Rarity asked, as she put down the bags full of groceries on the floor.

Sweetie Belle blushed and folded her ears against her head.

"Um... you know when you told me about heat cycles and foals? I did something similar to that..."

Rarity's jaw dropped and she froze in that position, before falling wayside with a sound of a metal object falling on a stone floor. Sweetie Belle frowned.

"Sis, are you alright?"