"Hey bro?" Rumble asked Thunderlane as he and his friend trotted up to the stallion.

"Yeah, what is it, lil buddy?" Thunderlane said turning to the two foals with an affectionate smile.

"Dinky was... I mean I was wondering... I mean Dinky's a filly, right?" Rumble asked, pointing a hoof at his friend.

"Right?" Thunderlane said uncertainly, looking at the blushing lavendar unicorn.

"So I was wondering, if I could..." Rumble said, drawing Thunderlane's attention again, "Have sex with her."

It's a good thing Thunderlane wasn't drinking soda at the time. He uh... he didn't know if Rumble had gotten the talk yet! "Not if she doesn't want to!" he blurted out in alarm.

Rumble's eyes widened, and he shook his head, "No, I only meant like... if I <i>could,</i> like if I could make her a mommy, not that I <i>would</i> do that. She was just saying that"

"That I heard that sex was really fun, and a colt and filly could do it," Dinky interrupted, speaking in the soft, bright voice of the little filly she was. "And that it could make me a mommy, just like my mommy."

"Well that's... true," Thunderlane said conservatively, the stirring in his groin indicating he probably wasn't the one she should be asking. "Do you want a foal?"

"Yeah!" Dinky said with a bright smile, "It sounds really fun! I already have a doll so if I had a foal it'd be like my doll could talk!" Giggling, she said, "Then I'd be a real mommy."

"I guess that's true," Thunderlane said, "But do you even know how foals are made?"

"Um... sex?" she asked shyly. "It's um... kissing and a special hug, and..."

"That's why I wanted to ask," Rumble cut in, "Because I didn't know if I could give her a foal or how hugging could do that. But <i>she</i> said---"

"It's okay, I get the picture," Thunderlane said curtly. "It's sort of like hugging, but also..." his sheath bulged, "...hey, why don't I show you?"

"Show us?" Rumble said uncertainly.

"Yeah, I could put a baby in Dinky really quick," Thunderlane said, trying to sound casual about it.

"You could?" Rumble asked.

"Yeah! I'll show you how it works, too," Thunderlane said. Turning to Dinky, he asked, "Do you mind me putting the baby in you, instead of him?"

"I guess not?" Dinky said uncertainly, "What would the difference be?"

"Not much, since we're brothers," Thunderlane replied, "Your foal'd look a little more like me, maybe. They come out as sort of a mixed up combo of the mommy and the daddy."

"The daddy?" Dinky said cluelessly, then her eyes widened in realization, "Ohh, so <i>that's</i> why there's a daddy!"

"Yep, you need a stallion before you can make a baby," Thunderlane said a little proudly. "Your body waits to make one, until the male's contributed his half of the deal. So I'll show you, but you have to let me put the baby in you, because once I've started, I don't really wanna stop."

"I guess that seems fair..." Dinky said, shifting on her hooves in puzzlement.

"Don't worry, Rumble can do it after I'm done," Thunderlane said appeasingly, "In fact if he does, then it might be my foal <i>or</i> his foal. You couldn't tell who's the daddy until they're born."

"Huh... that's kind of cool actually," Rumble mused, rubbing his chin with a hoof, "So it's like our male contribu...shuns sort of duke it out?"

"Yep, it's a race to see who's stuff can get Dinky a foal first," Thunderlane said, "She's only got <i>one</i> egg until she gives birth, and only one stallion's stuff can turn her egg into a foal."

"Well I'm up for that," Rumble said, fluttering his wings, "I bet my stuff wins the race."

"Your stuff?" Thunderlane said in amusement, "You got a long way to go before you can catch up with me." At his brother's dismay, he added, "...but your stuff could beat me. You couldn't beat me at flying, but giving Dinky a foal? Definitely, bro."

"Excuse me," Dinky said politely, as Thunderlane looked her way. Damn he was going to Tartarus for this, because that cute little filly standing there was gonna be carrying his foal. "Do you know what happens when you give birth? Nopony else wants to talk about it."

"I do, sorta," Thunderlane admitted, "But only females can give birth, so I can't do it myself. And um... females never let me see it happen either." He was grumbling towards the end, at those stupid closed doors while the mares made such strange noises behind them.

"I'll let you see it happen," Dinky said warmly, "Even if it's Rumble's. I just don't know what it means I have to give when I give birth."

"Why don't I get you pregnant first," Thunderlane suggested, "Then we can talk about how you're gonna give birth." A pause, and he added, "Pregnant means you're making the foal, but haven't given birth yet."

"Okay, so I'm... not making it yet?" Dinky asked.

Nodding, Thunderlane said, "Yup, but any male can help you get started. C'mon, lemme show you how."

With little Dinky on the bed, her rump was at just the right height. Thunderlane didn't mount her right away, hoping she'd at least hate it less if he got her really worked up first. "Alright, lift your tail, so I can see your fillyhood," Thunderlane instructed.

"W-we're not supposed to do that," Dinky said, looking back nervously.

"Yeah, by the same ponies who gave you a doll instead of a foal," Thunderlane replied, rolling his eyes. "Once I impregnate you, you'll make a <i>real pony</i> all by yourself, that's better than any doll, but you have to let me in under your tail. You got my permission to do it this time."

Nodding, Dinky lifted her tail, and Thunderlane could swear she looked wet down there already. "Alright now this is your tail," Thunderlane said, poking Dinky's dock with a hoof, making it pop up higher. "This's your poop hole," he said, booping her asshole, making Dinky squeak, "And this is your fillyhood," he concluded, pressing more strongly and gently massaging between her legs. She was so soft. It was almost a shame to fill that beautiful little cunny with his penis, almost.

"O-oh, you're rubbing... it," Dinky said distractedly.

"Feels pretty good, huh?" Thunderlane said, continuing the gentle circles of his hoof.

"Feels weird..." Dinky said distantly, but not moving away from him, "Sort of like... something..."

"It's your fillyhood getting ready to mate," Thunderlane explained helpfully, releasing the filly's pelvis. "First you have to get it really wet and slippery."

"H-how do I do that?" Dinky asked, her tail still piked up.

"It'll just happen," he said, "You'll just feel it start flowing in there, and maybe leaking out a little. See, when I do this," he softly stroked her slot, making her shiver, "It makes you feel more melty, right?"

"R-right," Dinky said, "So my fillyhood's... slimy and... stuff."

"Not yet," Thunderlane said, "But lemme work on it a bit. This isn't the part where you need a male, but it really helps if some other pony does it for you."

He rubbed her crotch, teasing her nipples until she started pushing her pussy against his hoof, to get more stimulation. "Your fillyhood's also sometimes called a slit, since it has one." 

Dinky blushed and didn't answer.

"But what I can do," Thunderlane offered slyly, putting a forehoof on either side of her rear, "...is spread your slit open." Firm pressure on her skin pulled those labia right open, where Dinky was already gleaming, pinkly.

"Oh that's... it's cold and... open," Dinky said, "T-this is okay?"

"Sure," Thunderlane replied, letting her slip closed, "Makes you feel really excited when I open you like that, huh?"

"Y-yeah..." Dinky said shyly, "I don't n-need to pee though."

"Well good, because I'm gonna do something that'll feel <i>really</i> good," Thunderlane declared, putting his nose under her tail. "How weird does <i>this</i> feel?" he asked. Then he pressed his tongue right up against Dinky's crotch, and as he slid it up, the pressure parted her labia, leaving him tasting her hot inner lips and her amazing juices.

"You're... you're licking it!" Dinky said in shock. Then she focused and stammered, "It feels r-really weird but not bad. Your tongue's really... you're really licking it??"

Thunderlane was entirely to busy with his lips and tongue to respond.

"Feels really... it's <i>tingling,"</i> Dinky panted, "I feel so... weird."

"Why are you breathing so hard?" Rumble asked in confusion, "You're just standing there."

"Yeah but it's <i>really</i> a lot..." Dinky said, rocking back against Thunderlane's tongue, "It's just really... <i>amazing."</i>

Looking at Rumble earnestly, Dinky whimpered, "It's... my whole fillyhood's... filling me up, with tingles I... I <i>really</i> like this."

"Yeah, he's... really licking you," Rumble said, looking between Dinky's legs, "And you're really pushing back into it."

"Cause I <i>want</i> it," Dinky panted, "More and more, I wanna push his whole... head into me." Blushing, she said, "I--I don't know what I'm feeling. Unh unh unh..."

Dinky was quiet from then, concentrating on pushing against Thunderlane's tongue and lips. Until the very end, her eyes snapped open and she said in an urgent panic, "Rumble! It won't... it's bigger! It won't go down!"

"Are you okay?" he asked in alarm, looking Dinky in the narrow pupilled eyes.

"I'm... I don't know!" she squeaked, rocking on hungry instinct more than consciously, "The tingling's filling me up! It feels so... good I can't... he won't stop, he keeps licking me!"

"It's okay, he knows what he's doing!" Rumble said frantically, "He'd stop if it wasn't okay! Just... let it fill you up!"

"It's..." Dinky said, her eyes losing focus as the orgasm took her. "So... good Rumble I... ahh... ahhhk---!" With a choked squeal, she orgasmed. Hunching over, trembling, convulsing against Thunderlane's skilled tongue. She looked at Rumble fearfully, but he didn't seem too disturbed by this thing that was happening to her here. As the orgasm swelled in her, her eyes dilated, and she moaned, "Ohh... wow..."

"Toldja he know what he's doing," Rumble said teasingly.

"It just... happened to me!" Dinky replied, breathing slower now that the pleasure was fading to echoes inside her. "My whole body was... was just like a fillyhood, and I couldn't even move it felt so good!"

"That's called orgasm," Thunderlane said helpfully, wiping off his muzzle, "It's what happens when a pony licks you there and stuff."

"Wow, I... I didn't know there was a orgasm," Dinky said dazedly.

"Felt better than anything you've ever felt before, huh?" Thunderlane suggested.

Dinky nodded without hesitation, "Yeah that was... I didn't know I <i>could</i> feel that good."

"Well, the good news is Rumble and me can orgasm <i>too,"</i> Thunderlane said, as Dinky gazed at him in growing adoration, "Imagine us feeling like that, and when we orgasm, that's when you get your foal."

"Oh, is it?" Dinky asked cautiously.

"Yeah, that's why I want to give you a foal so much," Thunderlane replied, "Because <i>that's</i> what it feels like, when I do."

"Ohh, well you better do it then," Dinky said, presenting her rump for him and instinctively lifting her tail. 

"Yeah, your orgasm made you really ready to have a foal," Thunderlane declared, "So the first thing I'm gonna do is mount you." He only had to half climb up on the bed over Dinky, saying, "Usually the stallion sits on you, like Rumble's gonna do, but I <i>really</i> wanna orgasm, so I'm just gonna do it like this."

"O-okay," Dinky said, trying to look up at him. Thunderlane prodded at her groin until his penis found her slick entrance.

"That's my penis," Thunderlane told her, "I'm pushing it against you. Feel good?"

"Feels... pushing?" Dinky said, "It's not orgasm. It feels a little good."

"Alright, here's why my penis is pushing at your fillyhood," Thunderlane said, and then with a groan of delight, he sank into the filly's birth canal.

"OH it's... it's sliding into me!" Dinky realized, in shock.

Thunderlane didn't clarify, so she told Rumble, "His thing is.. sliding. Deeper and deeper! It's... reallly... stretching me..."

Thunderlane bottomed out in the filly, halting his forward advance. "Can you feel me with your vagina?" he asked coyly, "You're wrapped all around me. That..." he pulled out slightly, "That's you. You're <i>opened...</i> and... and filled."

"It's... t-tight," Dinky whined, "I--I don't know if I can stretch open enough! I feel like I'm gonna...!"

"Just give it a sec," Thunderlane advised, "Your vagina can stretch so big that a whole foal can fit through it."

"R-really?" Dinky asked cluelessly.

"Have you ever seen a mare with a big belly, but she's not fat?" Thunderlane said, nuzzling the lavender filly's blonde curls, "That's where your foal's gonna go, deeper than where my penis is. Your belly's gonna get bigger and bigger as the foal grows big and strong, then one day with this huge belly, you're gonna start giving birth."

Balls deep in the filly, Thunderlane told her, "Your belly just starts squeezing, a little bit at first, then a whole lot. I-I've never been allowed to see it, but they really start yelling about it. Giving birth kinda... takes you over."

Dinky's trembling eased, as Thunderlane said, "The squeezing pushes your foal up against the inside of your vagina, then starts pushing your foal <i>through</i> your vagina. You're gonna push really hard, and you're gonna love pushing really hard, as you stretch open, and a foal comes out between your legs. <i>Right</i> where I am now."

"I... I wanna give birth," Dinky said quietly, "You're stretching me so much! Oh oh my belly wants to squeeze, and be <i>huge."</i>

"...I'm gonna f-fuck you now," Thunderlane said, pulling out of Dinky then pushing back in again.

"Oh you keep <i>moving,"</i> Dinky groaned, rocking back her small hips as Thunderlane's penis stretched her vagina wide.

"It's called thrusting..." Thunderlane said, wanting nothing more than to focus on that to the exclusion of all else. "When I slide... nhff... inside your vagina, it m-makes me orgasm."

"Oh, please orgasm," Dinky whined, her tail wrapping adoringly around Thunderlane's rump. 

"My <i>balls,"</i> he said, still thrusting slowly, "Are making <i>sperm.</i> I'm squirting my sperm into my... my cum. White... thick... cum, full of my sperm. When I orgasm, my penis <i>pumps,</i> and it's gonna start <i>pumping</i> that into you, spurt after spurt."

His thrusting sped up when Thunderlane couldn't hold back, gasping as he fucked the filly, "Seed... stays inside you... making you pregnant. All I have to do is... cum and you can't stop getting pregnant."

"I don't <i>wanna</i> stop," Dinky panted, "You keep... pushing deep, again and... again."

Thunderlane fucked Dinky, while Dinky stood there and needed it more and more. She didn't care if Rumble was looking at her, she just panted and fucked, and stared dully forward, all her attention on that penis invading her tingling passage.

"I wanna..." Rumble said, as Dinky struggled to focus on the colt, "I wanna put my penis in you... too," he said uncertainly, "My penis is big and it... wants to go into you."

"You gonna... pump your cum, too?" Dinky said in as husky a voice as her filly body could have.

"Y-yeah I don't... know, but I'm going to try," Rumble said tensely. "His balls are really... tight against his penis. He must be squirting a lot of... sperm in there."

Dinky smiled and would have answered, but Thunderlane flared in her then, and her pupils narrowed with a shocked squeak.

"What's wrong?" Rumble asked worriedly.

"He got... bigger!" Dinky blurted, hunching at the feeling, "S-so deep!"

"I'm ready to cum," Thunderlane said, "It seals your... womb to make <i>sure</i> my... cum gets inside. I hh--..."

"I guess he's gonna cum, then," Rumble said hopefully.

"Yeah, I... feel it so deep," Dinky replied, barely, "Where he's gonna... pump."

"Here it... nhm... Dinky you... I'm high on orga...gasm," Thunderlane said, "Can't... it's falling... oh <b>fuck"</b>  A blast of cum spurted up into Dinky. 

"He's---" she said in amazement, "Again! He keeps <i>pumping</i> it. Oh it's... warm! I-I'm filling up!"

D-dinky it's coming out of you," Rumble said in awe as it started to pour down between her legs.

"I'm <i>full,"</i> Dinky said in delerious pleasure, lolling her head back, "I feel so <i>fat.</i> His penis <i>and</i> his cum. Ohh... I was so <i>hungry</i> for this."