Rainbow Rocks her World presents: Twilight and the Magic of Estrus

Twilight glided down the gilded halls of Canterlot Castle, using what ever opportunity she had to fly. She needed to practice, after all-there were a lot of Dash's babies with wings, unsurprisingly. Like Rarity's little colt, Moon Gem. He took after his mother a fair amount-coat a light shade of grey, the same purple mane as Rarity. He was going to be quite pretty all grown up, Twilight mused.

She finally landed in the visitor's wing, finding the room Rarity had told her about. She'd opted for a long term room, rather than the tower she'd used for her brief visit long ago. Twilight trotted up, knocking politely and waiting. "Just a moment, Darling~"

Rarity opened the door, looking pleased. "Oh! Twilight, I'm glad it's you! I apologize for the rudeness, but you caught me in the middle of pumping. I'll need to continue during your visit," she said, apologetically.

Twilight shrugged as she trotted in, closing the door. "It's fine, Rarity-I think we've all walked in on feeding or pumping time," she laughed.

"Indeed! Now, what were you wanting to talk about?" Rarity asked, using magic to affix the breast pumps to herself, laying on her side, fat, full teats exposed to the world. Twilight sat next to her head-she could glance over and get a damn good view of those milky mammaries.

"Well...I want to make more babies." she admitted. "Rainbow had such fun doing it, and I'd like more descendants. I...I really enjoy being a parent to Twilight Glitter and Lucky Star. To have an even bigger family, with the friends so close they're family too...it..."

Rarity put her hoof on Twilight's. "I know exactly what you mean. Moonie has been...well. It feels like our little family in the Boutique is more complete with him. Sweetie's babysitting him today-she asked to! They've bonded so well...so yes, Twilight. I would be honored to bear your child next. Let us start making a more complete family,"

She leaned up, Twilight leaning down, and the pair kissed. Twilight was gentle, romantic-she knew how Rarity liked it, and she was going to make sure the conception was beautiful. She gently disengaged the pumps, lifting Rarity in her strong magic, taking her to the bed. Rarity giggled, "Why, Princess Sparkle! I do believe you may be trying to seduce me!"

Twilight laid her down gently onto the bed, crawling after her. "I do believe you'd be right, Lady Rarity," she practically purred, "But what pony could ever resist your beauty?" She emphasized it with another kiss, this one deeper, her forelimbs wrapping around her friend and holding her close.

The pair ran hooves over each other, Twilight enjoying her friends lithe, skinny form, Rarity enjoy her friend's alicorn form-taller, thinner in some places, muscled in others. It was a unique joy Rarity was always pleased to get her hooves on. She spread her back legs out, letting Twilight's sheath rest on her slit, their breasts pressed together and leaking milk that mixed together and spilled over their breasts.

Twilight's cock spilled out of said sheath, reaching up and out of Rarity's tits, Twilight moaning at the feeling of soft, warm flesh squeezing each side. She rolled her hips against the softness, Rarity holding her tits so Twilight could tit fuck her properly. The mare milk made surprisingly good lube, allowing the alicock to slid easily between the soft mounds, but this wasn't what Twilight was after. She pulled back, her hefty cock laying directly on Rarity's prim, proper slit. She was soaking wet, anticipating a nice thick slab of cock in her cunt and a shot of fertile alicorn jizz in her womb.

Twilight pulled back, flat cock head pressing right against Rarity's entrance. Twilight rolled her hips, teasing her friend with every brush and rubbing against her labia. It didn't take long for Twilight's cock to become drenched in Rarity's need, dripping onto the bed below them. Twilight pressed forward slowly, letting her cock head pop into the fashionista's slippery slit. She held it there, enjoying the warmth and tightness as Rarity clamped down.

"Celestia that feels good," she moaned, rolling her hips to pop her cock head in and out. Rarity shivered under her, moaning.

"Twilight, please! I...I need you! I need you to fuck me hard with your girl cock, and knock me up! Please, I want to be gravid with your foals, I want everyone who looks to know my prim pony pussy was pulverized by princess prick!" Twilight randomly though Pinkie would appreciate the alliteration more, but the message was loud and clear.

She hooked her front limbs under Rarity's back legs, lifting her bottom into the air, Twilight moving so she could stand, making sure her cock was always in Rarity. Twilight had folded Rarity like a pretzel, Rarity's back legs behind her ears. Twilight began to, slowly, feed more of her thick cock into Rarity's cunt, the position making sure she couldn't do more than a token struggle against the princess' purposeful slow stuffing.

"So, the thought of being bred turns you on?" Twilight teased, not exactly surprised. She gave a shallow thrust. "The thought of being a 'kept' mare? Kept in pregnancy and beautiful foals. I can't say it wouldn't be hot, especially if you were the Royal Foal Factory-pumping out foals for all of the princesses, a room maybe, just for knocking you up again,"

Rarity writhed and whined under her as Twilight thrust gently and shallowly. Each speculation or idea made Rarity juice up like Rainbow around cider, soaking her thigh and ass fur. Twilight pulled out, before slamming right in to the hilt. It had the desired effect-Rarity creamed as the cock hit her cervix, and with a second thrust as her back arched and she moaned, Twilight was in her womb.

Twilight thrust back and forth, hitting the back of Rarity's womb with each one. It felt good, stretching a pussy out around her throbbing cock, precum pooling in Rarity's foal factory. Rarity moaned writhing, "Please! Please, bred me, Twilight! Knock me up with your foals, fill me with so much cum there's no doubt I'll conceive! Fill me with so much I'll have an entire herd!"

Twilight shivered with arousal at the thought of unloading that much cum, and began frantically humping Rarity, squishing wetly in her drenched cunt. Twilight's cock throbbed heavily, her balls drawing up, ready to unleash her seed. She let Rarity;s legs go down, the pair holding each other tight as they rolled their hips together, until Twilight grabbed Rarity's and held her still as Twilight came, each thrust packing in yet another massive spurt of sperm, Rarity's womb ballooning under her taunt flesh.

Twilight let out a satisfied sigh, laying down next to Rarity, the pair cuddling in the afterglow. "That was very nice, Twilight...but promise you'll come back and make sure it takes?"

Twilight laughed, "You bet, Rarity!" Twilight had only just started, after all.