Estrus For Two

Sweetie Belle stretched her forelegs out high above her head, yawning, greeted by the light of the morning sun that managed to slip in through a crack between goldish curtains of Carousel Boutique.

Rubbing the sleep off her eyes, Sweetie rolled over to the side of her bed as something slippery and somewhat gooey between her hind legs caught her attention. She tentatively reached down with a hoof and touched her intimate parts with caution as some new strange sensation shot through her body, causing her to squeeze her eyes tight. Her hoof returned with beads of transparent liquid on it.

Sweetie threw the covers off in a quick motion and looked down between her hind legs. Her nether lips seemed to look puffier than usual but worst of all was the fact that there was that sticky fluid all over her crotch, trickling down her thighs. It had leaked down onto the bedsheets too.

A moment of panic came over Sweetie Belle. Have I wet myself in bed? the filly thought, terrified. It’s been like years since I last did it.

“Sweetie, get up, breakfast is ready.” Rarity’s voice came out from the next room, sweet as honey. But for Sweetie Belle it sounded like a cry from a horror film. She couldn’t meet Rarity like this. Not with her filly bits all wet and slippery. What would her sister think of her? She wasn’t that little foal anymore that used to get scared at night from the slightest noise with obvious consequences and the changing of the sheets the next morning.

“I’m coming,” Sweetie shouted nervously to her sister. She started to rub her crotch vigorously, trying to wipe the mess off, as another much stronger jolt of that same queer sensation hit her. She threw a hoof up at that, her teeth clenched together. Something began to throb down there and the whole area had become even more sensitive than before. Sweetie watched in awe as a pink nub emerged out from under her folds and then slipped back in. Then again and again. As if it was winking at her. A more viscous liquid was leaking out from her opening, making her attempts at cleaning herself a futile exercise. Her sheets had become even more of a mess, a big transparent puddle on it.

Sweetie let out a yelp, both from a terrible thought that her sister might see her in such a state and from a warm sensation circulating down her hind legs as she touched herself there. It was much more pleasant than she wanted to admit.

A hoof knocked on the door. “Is everything ok, Sweetie? I heard noises,” Rarity called.

“Y-yes, I’m fine. I just... Give me a minute,” Sweetie stuttered.

“Okay, darling, but your tea is getting cold.”

It took all Sweetie’s will to take her hoof off of her slit and make an attempt to reconsider what to do next. She lay down on her bed, her breath rapid as if she had just finished a marathon.

What’s wrong with me? the filly thought. That’s never happened before. Am I sick? Am I going to die? Am I going to pee myself for the rest of my life? She lay there for long minutes, almost defeated, trying to think of how to present her sticky situation to her sister.

Another knock on the door. “Sweetie, I’m coming in.”

“No!” Sweetie Belle cried. She managed to jump straight up and sit on the edge of the bed, hiding the sticky mess under the covers at the last second.

Rarity walked into the room, her snout creasing slightly as she came up closer to Sweetie. Because the window had been closed, Sweetie’s strong odor had permeated the whole room by now. Rarity opened the window wide and sat down on the bed next to her little sister.

“Are you alright, Sweetie?” There were traces of worry emanating from Rarity’s voice.

“Why do you ask?” Sweetie said, trying to feign a smile. “Everything is just fine.”

“You can’t trick me, darling. I sense you’re nervous.” Rarity took another sniff of the tart air. “You don’t have to be ashamed of it. Especially not in front of your sister.”

“What are you talking about?” Sweetie giggled nervously, her hind legs clenched together.

Rarity’s magic clutched the cover and threw it off the bed onto the floor, revealing a big darkened stain on the otherwise pure white sheets. Sweetie’s face turned red.

“Sweetie, it’s okay,” Rarity assured. “I’m not angry at you. Every mare goes through it. Even I sometimes stain my sheets.”

Sweetie’s eyes went wide at the confession of her sister. “You mean–” Sweetie’s voice was quiet. “You mean you pee yourself in bed too?”

“What?” Rarity blinked her eyes rapidly as if her mind slipped off into another reality for a moment. “What are you talking about, Sweetie? It’s not... Oh, Celestia. Don’t tell me our mother hasn’t spoken to you about estrus.”

“Es-what?”

It took all Rarity’s will to not faint. “I need my coffee,” she muttered. “Come down into the dining hall. I’ll explain everything there. And don’t bother yourself with the sheets. I’ll change them later.”

Rarity walked out of the room and Sweetie followed, her head hung and her shoulders sagged. While stepping down the stairs, her thighs rubbed against one another and already the familiar tickling sensation returned to her rear, her flower letting out a few more droplets of nectar. Sweetie cringed, hoping that Rarity would not find out who’d stained her favorite carpet runner.

The sisters sat down at the table silently as if it had been the most boring morning ever and there was nothing to talk about. Rarity poured herself a mug of black coffee and a cup of green tea for her little sister. “Do you need sugar, Sweetie?” she asked.

“No thanks, it’s fine,” Sweetie replied in a grave tone.

“I can’t believe Mother hasn’t spoken of such an important topic with you. It was her responsibility to tell you everything and prepare you for your first cycle.” Rarity gave out a puff of air.

Sweetie Belle leaned on her elbow. “Maybe since I spent time with you more than at home, she was thinking that you’d already told me everything I needed to know about... this.”

“It doesn’t justify that she...” Rarity trailed off. “I think that’s my fault too. I should have been more considerate of you. Well, in any case, we’re going to make up for it now. Do you have any questions first, Sweetie?”

A swarm of questions swirled in Sweetie’s mind. How come she became so wet down there and yet felt so... thirsty? The fire in her nethers burned and demanded to be quelled the same way a dry throat indicates the need for a glass of water. With an exception that the heat between her legs was ten times more persistent than any of the thirsts she’d ever felt and there was no way she could quench that heat with water. She needed something more strong to fill her down there. Something more virile maybe? She couldn’t put her hoof on it yet but somehow knew that she would recognize it the moment she saw her remedy.

“What’s wrong with my body?” Sweetie asked, disconcerted. “Is it some virus? Please tell me it’s nothing serious.”

The filly could not assume that such an itch was a normal thing. Her first thought was that she must have caught some rare disease during the class tour to Crystal Empire to celebrate her and her friends’ brand new Cutie Marks. She should have listened to Cheerilee and not wandered around, touching suspicious things. Now it was time to reap the fruits of her ignorance.

“Calm down, Sweetie.” Rarity stretched her hoof out and patted her sister’s head, attempting to reassure her before her nervousness turned into a panic. “You’re not sick. You just hit your first estrus cycle. All mares without exception go through it. It’s a natural thing.”

“How can it be natural?” Sweetie demanded, pouting. “My filly part... It’s swollen and it’s constantly wet. And it itches like somepony sprinkled pepper powder down there.”

Rarity gave a faint smile. “These traits are both to attract a stallion and to help a mare conceive a foal. It may seem inconvenient or even annoying, but without it the pony nation would’ve never achieved such prosperity and dominated the continent as we do now. Perhaps we would’ve even gone extinct. Of course, our culture has developed a lot since then but our bodies are all the same. And even if there’s no need for some of these traits in our time, we can’t deny ourselves of who we are.”

“But why did it happen now? I’ve never felt anything like this before.” Sweetie Belle’s sour expression only grew more so.

“You see, Sweetie,” Rarity began in a gentle voice. “When a filly gets her Cutie Mark, she finds out her destiny. And while everypony has her own fate and choices to make, along with that comes the privilege of bearing a foal. When you got your Cutie Mark, your body also changed and now the time has come for those changes to be applied.”

Sweetie rubbed her temples, trying to contemplate a flow of information that had been just poured out upon her. She’d never thought of such complex things. She’d just wanted a Cutie Mark like other foals, so there would be something special about her. And now she got much more than she ever bargained for.

At least it became obvious why Diamond Tiara and other fillies had such strong odor during summer days. All this time Sweetie had believed that the ponies just sweated a lot and forgot to take a shower. She’d never pointed it out, lest she be thought of to be rude.

“So, how do exactly a stallion and a mare make a foal?” Sweetie asked finally.

Rarity moved aside the half-full mug of coffee and levitated a bottle of fine red wine from a nearby cabinet. She poured herself a glass, made a big gulp, then continued.

“You see, Sweetie... How should I put it? At first, a mare finds herself a special somepony. Then, when the mare hits her estrus and they have decided to make a foal, the stallion walks up to the mare’s rear and mounts her, putting his hooves on her back. Then he inserts his penis into her vagina and thrusts his hips in. And after some time the head of his penis flares and he injects his special seed called semen into her womb. And then after eleven months, a foal is born.”

“That’s gross,” Sweetie said, her facial features contorting into an expression of pure disgust. “I’d never do such a thing. Can’t I just drink some potion or use a magic spell and never have to think about estrus again?

“I’m afraid there is no such thing, Sweetie. We can’t just change our bodies and instincts, at least not without serious consequences. The only thing that can quench mare’s heat is a good rutting with a further ejaculation of stallion’s semen.”

“And how do you deal with it?” Sweetie asked, raising her brow suspiciously. “Don’t tell me you stick a stallion’s penis in your vagina.”

Rarity cleared her throat and took another sip of wine from her glass. “It’s not so bad as it might seem at first, Sweetie. The stallion penis, or cock, as it’s sometimes called, is quite an exquisite organ and it feels very good when it enters and stretches you.”

Rarity stopped to allow herself a moment of fantasizing, the heat between her haunches getting the best of her for the first time since morning. “In the end, when a mare orgasms it’s like a million needles are tickling your body all at once and all that you can think of is for that marvelous sensation to never end,” Rarity said, her smile broadening.

Sweetie observed her sister’s mood swing skeptically, musing whether she’d made the last part up to spruce things up so that the whole estrus thing didn’t seem so bad. She looked at Rarity, who was grinning like a fool now, almost drooling, and concluded that she was sincere.

The filly tried to imagine what it would feel like to have something between her hind legs pressing against the most private parts of her body, a spot she’d grown to believe it would be immoral to have contact with. Somehow the thought didn’t seem so gross now and only spurred the heat inside her.

She found that it became harder for her to concentrate and all her attention was focused on the area below her belly. The itch between her hind legs seemed to only grow stronger. To her horror, Sweetie found herself thinking that she might have been better off without her Cutie Mark. She took a glance on her flank and all her silly doubts were instantly gone. A striped shield with a bright star etched with a music note on it. That little cutie was beyond any price and she definitely could endure an itch between her hind legs once in a while for it.

And still, it would be better if that annoying sensation was gone. She looked down and watched her lower muscles tense a bit, bringing her clitoris up on display for everypony to see. Then it slid back under the folds as if offering to chase after it, trying to lure its prey into the depths of her tunnel.

An insatiable desire for following it built up in Sweetie Belle with every second passed. She stretched her hoof down and put it gingerly on the edge of her vulva. She rubbed her hoof up and down her slit, letting out a little moan every time it touched her sensitive clit.

“I wouldn’t recommend it.” Rarity’s words came out of the blue.

Sweetie threw her hoof up, having completely forgotten that she was sitting at the same table with her sister. She waved her soggy hoof, shaking the juices off and making them land all over the tablecloths. “I just...” the filly stammered. “It itches so bad.”

“I know, Sweetie,” Rarity said, looking at her sister sympathetically. “And while you can find a temporary relief in touching yourself, you’ll only irritate your pussy more and make everything worse.”

Sweetie gave out a sigh of defeat. “What do I do? That heat and itch and all of this. It slowly kills me. And I don’t even have a coltfriend.”

“Well, it’s not necessary to have one.”

“But you said I need a special som–”

“I said,” Rarity interrupted. “That you have to have somepony rut you good and hard to get rid of this sensation. And there are special places where you can find a perfect stallion for just that. For a reasonable amount of bits, of course.”

“Like a farm?” Sweetie guessed.

Rarity almost choked on her wine, screwing her face as if somepony just called her a hick. “A lady would never visit such a place for satisfying her urges, Sweetie. I’m talking about elite brothels in Canterlot. I would claim that there’s no better place for a mare in heat than one particular place called ‘The Wild Stallion’. Only the best studs work there and the quality of service is quite divine, I can tell you that. And it’s highly rated by critics too, many of whom I know personally.”

Sweetie Belle stared at the floor, her spirits fallen. “It must cost a lot,” she said, sighing.

“There’s no price I would not pay to make my little sister happy,” Rarity stated firmly.

Sweetie’s smile grew wide, her eyes sparkling like two stars. “Do you mean–?”

“Yes, Sweetie. I was already going to visit that place, but what can be better than spending some quality time with my sister while doing so?”

“Yeah! Sister Bonding!” Sweetie cheered up as she almost jumped up from her seat.

“Now, now, Sweetie. Eat your breakfast first.”

Rarity put down the empty glass and watched Sweetie munch her omelette while humming a soft melody. The night was obviously going to be much more enjoyable than she had planned.