Big Mac was blushing, but that hardly felt like a big enough word. Rainbow had come when she had felt the need, and she was exuding it all over. "Hate ta ask, RD. Um, but how'd ya never notice this ever happenin' afore?"

"Like I said! It's all goopy, so I just washed it out." She shook her head. "Sometimes I feel really silly, knowing nothing about this stuff."

Big Mac covered his eyes with a hoof as he sat down in place. He took a moment to look anywhere else in his room. "Ya just ignored it?"

"Yep." Rainbow swished her tail. "Awkward, now that somepony actually told me what it was. So, let's get to it. Put a foal up in there. That's a stallion's job." She pointed at her own chest. "Which I am not. I can't give Applejack her foal, you can. No more delays."

Big Mac wanted to bolt out of the house. His mind had trouble getting past how blunt Rainbow was being. The rational part of his brain reminded him that they'd done things more intimate than this. At the same time, he felt awkward and uncomfortable. He took a slow breath. "Fer Applejack. Right. Rainbow, yer a damn good frien', and kinda awful at this." He chuckled softly as he rose up to his hooves, feeling a weight swaying beneath him.

Being next to such a thickly in-heat mare, knowing exactly what she wanted, and who from, had his body tense and ready. His thick shaft was already in the air, twitching with nature's growing demand that Big Mac give Rainbow exactly what she was asking for.

Rainbow wasn't blind, or naïve. She could see the protrusion under Big Mac, but he didn't seem inclined to go further. "Aw c'mon, do I have to?" She turned away from him, tail already raised. "Everypony already gave you permission. One ride on the Rainbow rollercoaster, just for you."

Big Mac advanced on her. "Y'ain't scared? It'll be yer first time, right?" He put a hoof on her hips, then another, slowly climbing up on her. Her scent became more powerful as he got closer. It wasn't exactly what he'd label as pleasant, but its message was intoxicating, and the way it made him feel counteracted it nicely.

"Pfft. As if. I can handle anything!" Rainbow's attitude seemed to soften at the same time her expression went tense. "But, um, hey, I know you're kind of used to Sugar Belle. I'm not her. Um, not trying to be. This'll be the one time, then I'll get out of your mane, promise."

Big Mac slid across her back and nipped at her mane, biting and pulling gently. Rainbow gasped sharply. She'd been bit before, even around there, but at that time, by a stallion, her body flooded her with new subtle angles on the whole experience. "Yeah... More of that. Don't stop. Stallions bite." She squirmed in place, ready to make her point very clear. "It's good."

"Nah, mares like it too." He continued to bite her gently, walking his hooves down her body. "Ya ready?" He needn't have asked, feeling her wet nethers winking against the very end of his shaft. She couldn't have been much readier if she tried. "Gonna start. Gonna go slow."

"Yeah yeah." Rainbow pushed her hips back towards him. "Can't make a foal from just standing there, cowpony." She had no clue why those words slipped out of her mouth, but she liked the way they felt, and the way Big Mac's weight felt pressing down on her. In that moment, she wanted him, badly. "Do it."

"Welp, ah did promise." He advanced, careful as he pressed at Rainbow's entrance. He hesitated a moment as the end of his shaft pressed harder against her lips, fighting the urge to continue immediately. Her opening flexed back at him, pushing hard against his tip. It only lasted a moment before giving in and sliding open. He sank several inches into her and both let out soft cries together with their different pleasures.

He hugged her close as he worked into her, pushing deeper and deeper into her heat. The odder part was that she really was pushing back on him, almost fucking herself in a way. "Ya don't, mmf, gotta do everythin' fast, ya silly mare."

"Oh I know." Rainbow groaned, pressing back into Big Mac. She lifted a hoof to bite on it as Big Mac continued to push in and fill her with himself. "It's just that, hah, my first time is supposed to be a wild ride, right?" A line of drool escaped her in her heaving gasps for breath. "I'm just making sure!" She shuddered around and under him. "Go on!"

Big Mac arched his back, feeling her grip clamping down on him already. He'd felt it before with other mares, but it had been a while since he'd even seen this sort of heat from one. Her body was begging him without words, ready to receive exactly what he had ready. His balls burned hot, roiling with seed to satisfy the mare he was working against. It only took a moment more before he could push no further, buried hilt deep in her.

Rainbow groaned softly, twisting back and forth. "I can feel you in there. So big! Ah!" She writhed and trembled as Big Mac ground into her, humping gently with his needs. "Yeah! Put that foal, mmf, in there!" She had come just for an insemination, to have a child casually placed in her, but nature had its demands, and it felt too good to take in any detached way. "Harder!"

Big Mac grinned, more at her reaction than her request. He was slow to start, thrusting in and out of Rainbow Dash, shaking her under him. Every motion from him dragged his prick in and out of her, pressing her tender walls open and making her grunt softly. He couldn't keep it slow for much longer, each push faster than the last. The two of them were becoming one smooth machine, pistoning against one another with rising passion.

"Yeah, yeah! More! Harder!" Rainbow slammed her rump back into Big Mac as he slid into her, meeting his thrusts with her own needy motions. He growled and grunted over her, sliding across her back as she bucked him. "Fuck! C'mon! You're doing it for your sister!"

Big Mac rolled his eyes at that, but grunted with renewed vigor.

Rainbow flexed around him, milking his pole with her entire passage as she called out. "Oh my gosh! That's amazing!" Her hooves kicked and scraped at the ground as she let herself go, blindly squirming and squealing as pleasure cascaded over her body. She trembled as her body slipped over some unseen bump, vision going hazy. She hissed as she trembled, pleasure exploding through her in climax.

Big Mac pushed through it, working his member through that wildly flexing passage. He could feel her heat flowing around him, beating on him with its' need for his seed. Rainbow continued to spasm and convulse, pressing on him with tight wetness. She seemed to only get hotter and more aggressive in her motions.

He bit her shoulder, holding her as he worked in a subtly new angle against her, feeling his own tension rising up towards its peak.

Rainbow swooned softly at the bite, mouth open but barely able to make a sound. "Mmf! Yes! Gimme!"

Big Mac suddenly hugged her, pulling her back tight until they were locked as tightly close together as they could be. He neighed as he twitched and spasmed within her, sending rope after thick rope of seed flooding into her, giving them both what they wanted in that exact moment.

Rainbow threw back her head with a soft gasp. "Ooh, hot! Feels good." She pressed her rump back into his crotch with a satisfied sigh. "Ah! Ah, yeah." Sense started to come back to her, as if the heat within her was just doused, literally really, with water. "Wow." She sank a little, huffing. "That felt like I just cleared the sky, a whole crowd cheering for me. You're not bad at this, big guy."

Big Mac climbed off her, nuzzling along her flank. "You're gonna be fine, Rainbow." He nipped her gently, enjoying her twitch. "But that's it. Ah'm still Sugar Belle's." His face colored. "If ya want to get naughty with somepony, go fin' Applejack."

Rainbow grinned. "I do like to hear her groan and grumble at me." She glanced back, seeing him, but only for a moment before it became awkward. "Heh, uh, so you know, this wasn't about my pleasure, right?" She pinned an ear back. "Even if that did kinda feel good. Um, thanks." She rubbed behind her head. "That was my first time with a stallion, and it was great. Um, so, if that worked, I'll let you know. Shoot, let you know either way. Either we celebrate a new foal, or we have to try again in the next heat, right?"

Big Mac made sure Rainbow was steady on her hooves as he sank down onto his own haunches. "Gonna hope that took. Felt fine, but also feel like ah'm cheatin', even if ah got permission." He laughed at the situation. "Should be fine, but gosh if this don't get weird for the both of us."

Rainbow grinned at Big Mac. "Well, maybe next time I should try it in the hay bales with Applejack." She laughed and dashed out of the room before Big Mac could reply.

Big Mac sat up and sighed, then lifted a hoof to bite at it. His prick stood out, hard and ready for more. "That ain't fair." He huffed softly. "An ya should really clean up." But she was already long gone. "Silly mare." He shook his head and headed for the bath for himself.

Elsewhere, Applejack set down a basket full of apples. "Phew." She nodded at the stack of them she had just gotten into position. "A hard day's work." He padded them all as she turned away. "But why does somethin' not feel right?"

"Sounds like you need a break," said Sugar Belle as she strolled over.

Applejack smiled. "Hiya, Sug! How ya doin' today?"

"I'm fine, thank you." The two met in a soft hug. "I saw my sister looking sweaty and happy and thought I'd come say hello."

Applejack laughed. "Shoot, jus' gettin' chores done, ya know?" She reached to touch hooves with Sugar. "Always good to see ya. Ah'm surprised we ain't seen much of each other lately."

Sugar gave Applejack a long look up and down. "We're sisters, family." She touched noses with Applejack. "And I'm thinking about moving here."

Applejack started at that. "Really?! Well! Yer welcome on this farm, ah can promise that. Thought ya were mighty attached to that bakery ah yers."

Sugar grinned. "My family comes first." She took a slow breath. "Rainbow Dash will always be my sister, but the foal isn't mine. It's yours. And as silly as it sounds, that makes you my family now."

Applejack blinked slowly. "Come again?"

Author's Note

They did it! They did the thing! Applejack is only just hearing about it. Sugar Belle, ya messed up! Or did she?

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