Teatime

She wasn't sure what made her ask the question. She just knew that she had to, and that it was important that she did so. It was vital... for some reason.

She brushed that feeling aside.

"Would you like to join us for tea, this morning?" Celestia asked.

"Oh," Twilight said. "I'd love to!"

Luna took a sip of her tea. It was Earl Grey today. Not her favorite, but she'd been in the mood for it... or so she'd thought. Oh well.

Using her magic, she put her cup back on its saucer, and then put the saucer back on her table... which, at the moment, was Celestia, trembling on her hands and knees at Luna's feet.

"Careful, sister," Luna said. "You wouldn't want to spill my tea, would you? I imagine that would be rather unpleasant for you."

Celestia bit the inside of her cheek and tried not to move. She was currently collared, naked, and bound, a spreader bar locking her back legs into place and her wings tied with elastic. The familliar plugs had been inserted into her ass and cunt, the one in her cunt pulsing with vibration every few seconds. She could feel an orgasm building, but agonizingly slowly.

Both plugs carried the cutie mark of their owner.

But none of that mattered. She'd managed, through some miraculous burst of willpower, to ask Twilight to tea with them. When she arrived, all of this would be over. The nightmare would finally end.

She just had to hold out until then.

"You're oddly quiet," Luna remarked. "What, no begging today? No resistance left in you? Well, I know that last part isn't true, or at least I hope not. That would make today's events very boring indeed."

The doors burst open.

"Sorry I'm late," Twilight said, stepping through, letting the doors swing shut behind her. "I was busy looking after—"

She looked up... and froze.

"Princess Celestia, what—"

"Twilight!" Celestia shouted. "It's Luna, she's become the Nightmare again, you have to stop her! Quickly!"

"Princess Luna is—"

"Didn't I tell you," Luna said, sitting most unconcernedly in her chair and sipping at her teacup. "That I'm not Nightmare Moon?"

Twilight looked confusedly between the two of them.

"I don't—"

"It's okay, Twilight," Luna said, smirking. "You can drop the act."

"W-what?"

"I allow you to be your true self in front of Celestia."

And all at once, Twilight's demeanor changed. The shock and concern in her face melted away, replaced by a blank smile that sent shivers down Celestia's spine.

"Yes..." she said.

"... my mistress."

Celestia's eyes were wide. What—mistress? What was happening?

"I assume you're rather confused, Celestia," Luna guessed correctly. "Perhaps this will illuminate things for you. Twilight, take off your dress."

"Yes mistress."

Celestia watched in horror as Twilight removed her clothes, revealing...

Revealing...

Thin, purple-colored ropes criss-crossed across her torso, bound with little knots. Two of the ropes wound round her breasts, forcing them up a little. Another two dug into her crotch.

Her soaked, dripping crotch.

Twilight blushed.

"No need to be embarrassed, Twilight," Luna said. "Not around us."

"T-Twilight," Celestia stammered. "I-I don't understand... why..."

"You still don't get it sister? I'm surprised." Luna said. "Twilight, who is your mistress?"

"You are, mistress."

"And why am I your mistress?"

"Because you showed me my true self, mistress. You taught me the pleasure of obedience."

Luna turned to Celestia, smugness in her face.

"You see," she explained, "Twilight was my... my little guinea pig, shall we say. After all, I had to make sure I got all this right when I tried it on you, sister. So, a few months ago, I began visiting Twilight in her dreams... planting the seeds of suggestion and obedience into her mind, just as I have with you."

"Of course," she continued, "My methods weren't perfected yet, and she resisted at first, but... well, you can see the results for yourself."

Tears welled up in Celestia's eyes. To see her student, her lovely, wonderful student, in such a state was more than she could bear.

"Twilight..."

"Oh, don't worry about her," Luna said. "She's happier this way. Aren't you, Twilight?"

"Yes, mistress. I'm much happier now that I'm your slave."

Luna smiled. "See? Well, you'll understand soon. After all..."

She looked Celestia in the eyes.

"You'll be just like her soon."

She took a step back. "Today is the final lesson, Celestia. Are you ready? Because I am. I've been waiting for this day for over a millennia."

"Luna, please," Celestia begged. "You can do whatever you want from me, but let Twilight go. She has nothing to do with this!"

"Sacrificing yourself for your student's freedom?" Luna said. "How very like you, Celestia. But I'm not in the mood to make deals, not when I've already won."

"Please, Luna! You can't be this cruel!"

"Cruel?" Luna scoffed. "Cruel, she says. After imprisoning your own sister on the moon for a thousand years, I'm the cruel one? Don't I deserve some recompense for that Celestia? Am I not entitled to something?"

"Besides," she said, "you heard her. She's happier now than she's ever been... under you. In fact, that gives me an idea."

She turned to Twilight. "Twilight Sparkle. Why don't you help your... former... teacher see just how much happier she'd be if she'd just stop resisting and give herself over to me? Like I showed you."

Twilight looked at Celestia. She licked her lips.

"With pleasure, mistress."

"Did you know, Twilight here had quite a thing for you," Luna said, idly. "I got to experience it first-hoof in her dreams. She was utterly infatuated... not that I think she'd have ever actually shown it, mind you."

She grinned.

"You must be rather excited about this, aren't you Twilight?"

"Very, mistress," Twilight said, stepping forward. "Thank you."

"You're very welcome, my slave. Allow me to get things ready for you. Stand, dear sister."

Celestia got to her feet, slowly, clumsily with the spreader bar still in place.

The vibrator was removed slowly, Celestia's juices trailing after it. Celestia let out a moan as the soft material rubbed against her clit.

"Hands behind your back."

Celestia did as she was told.

Luna bound her hands behind her back with a strap of cloth, then stretched that down and tied the end to the spreader bar that even now held Celestia's legs open. The length was just a little too short, forcing Celestia's chest—and her crotch—out, just slightly.

"There you go," Luna said. "My present to you, my slave. Do as you see fit."

And with that, she sat back to watch the show.

Twilight circled around Celestia's naked body, taking in her figure. She reached out with a finger traced her way from one sun-laden hip, across her ass, to the other, finally ending by brushing against Celestia's marehood. Celestia let out an involuntary squeak. Bound as she was, the shot of pleasure seemed all the more powerful.

Twilight giggled.

"Twilight, please," Celestia begged. "You mustn't let her control you! You have to fight it, Twilight?"

"Why would I want to do that?" Twilight replied.

"Because... because..."

The words had to be there, Celestia thought, but they wouldn't come out.

Why should she resist?

After all...

Obedience is pleasure, whispered that voice in the back of her mind, unbidden.

Twilight circled around her once more, stopping behind her. Her hands wrapped softly around her waist.

"Twilight—" Celestia started to say. She was cut off, however, as Twilight's hands slid across her skin, one upwards, one downwards.

"Shh," Twilight said, as her hands moved. "Just enjoy it."

One hand, the right hand, curled around Celestia's breast, groping her. The other continued down, down, until...

"A-ah..."

Twilight's fingers brushed softly against the entrance to Celestia's cunt.

"Wow, princess," Twilight said, that same smile still on her face. "You're so wet already..."

And with that, she began. Her right hand began to knead Celestia's breast, pressing into her skin and sending shivers down her spine.

And her left...

"Ah!"

Twilight's fingers spread the folds of Celestia's dripping marehood apart. A finger slipped inside, began to stroke in Celestia's most sensitive of places, in time with the jolts of pleasure coming from her breasts.

Celestia let out a moan as Twilight's fingers pressed against a specific spot. Twilight giggled.

Celestia panted as Twilight continued her ministrations. Ropes of her juices stretched and fell as Twilight's fingers pistoned in and out of her, her palm brushing every so often against her clit and sending jolts of pleasure racing through her body. When had her most loyal student learned to take care of a mare like this? The thought went as soon as it came, replaced by a dull blanket of pleasure that began to bury her thoughts.

"Ah... A-ah..." Celestia moaned. She could feel the orgasm building, like a rush of water hitting a dam. Building... building...

And then it stopped. Right on the cusp of flowing over, it stopped, leaving her hanging on the precipice.

As if she had read her mind, Luna spoke up. "Remember, sister," she said, "your orgasms are reserved for me, and me alone."

Twilight continued, unhindered, and Celestia ached for release. They continued like that for some time, until both of them were panting, drooling messes. To Celestia, it felt like an age had passed.

Twilight's hands withdrew. The sudden lapse in pleasure made Celestia droop, exhausted already. The break wouldn't last long.

Twilight circled back around to Celestia's front side. She was licking her juices off of her fingers, one at a time.

"Princess," she said. "I always thought you were beautiful."

Fingers cleaned off, she knelt in front of Celestia's dripping crotch. Her arms wrapped around to Celestia's back.

"I always wanted to do this with you."

"Twilight, don't..."

Twilight's tongue pushed its way between her folds, and she yelped. The waters that had receded when Twilight had released her now began to build again, twice as powerfully as before. And still, even as Twilight's tongue danced around inside her, kissed her clit and rubbed each and every place that Celestia held sacred, she could not make it over that edge. Twilight held her there, and time seemed to stretch into infinity as her thoughts once again clouded.

Drool dripped from her mouth. Juices dripped from her cunt, Twilight lapping them up like water. She couldn't take this. She just couldn't.

After another age in that state of agonizing almost-bliss, Luna spoke. Celestia could barely hang on to her words.

"Twilight, my dear, you're being very predictable. I have another idea. Why don't you use this?"

Celestia couldn't see whatever it was she was offering, but Twilight stopped. She was panting, too, and her own slit was dripping onto the balcony.

"Of course, mistress," she said, hurridly, and stood up, passing out of Celestia's view. Celestia tried to turn her head to see, but she didn't have the strength. She merely hung, her eyes drawing closed. Tears she hadn't realized she;d been crying ran down her face.

When Twilight returned, she was wearing...

It was an obscene thing; a horsecock, made of some kind of rubber, like the one that had occupied her earlier. Unlike that one, however, this had further attachments: a set of straps, designed to hold the thing to a mare's waist.

Which they were, to Twilight's.

The strap around Celestia's wrists fell away. She felt a sandaled foot dig into her back, and she was pushed forward. She only barely managed to catch herself.

"Go ahead, my slave," Luna said to Twilight. "Fuck her."

"With pleasure, mistress."

Celestia didn't have the strength left to protest as the thing attached to Twilight pushed its way into her. Slowly, at first, then Twilight thrust her hips forward and the entire thing slid in, forcing a yelp form Celestia's mouth. It was just barely too big; she felt like she was going to burst.

And then Twilight's hips began to move. Back and forth, again, slowly at first, but picking up speed. The horsecock thrust in and out of her gaping pussy, and each thrust hit her harder than the last.

And still.

Still.

Still she was held on the edge of that cliff, unable to push over the edge.

It was breaking her. She could feel it breaking her, the pleasure overwhelming her mind, her ability to think.

A pair of sandaled feet crossed in front of Celestia's face. Luna's.

Luna knelt down, cupped Celestia's chin in a latex-clad hand forced her head up so they were looking at each other.

"P-please," Celestia begged. "Let me cum..." It was all she could think of to say.

Luna laughed. "No," she said. "Not yet. There's a lesson to be taught first. The final lesson."

She smiled.

"Obedience is?"

"P-pleasure," Celestia stammered out between thrusts of Twilight's strap-on. "Pleasure. Obedience is pleasure!"

"Good," Luna purred. "Do you know why obedience is pleasure, Celestia?"

"N-no..."

"It's because you love it."

Twilight thrust forward, harder than before, and Celestia's vision went unfocused. When it came back, Luna was smiling down at her.

"And you do love being my little slave, don't you... dear sister?"

And that was it. The last little nudge to send Celestia over the edge.

Just like that, Celestia finally...

Broke.

All conscious thought—gone.

Just.

Like.

That.

A weak smile overtook Celestia's features.

"Yes..." she said, slowly. "I do... love... being your slave... sister..."

Luna cackled.

"Yes!" she shouted. "Yes, you do, don't you, my little fuckslave?"

"Yes... sister..."

"I win!" she said, standing. "I finally win! You're mine, Celestia! Forever!"

"Yes..." Celestia said. "Thank you for teaching me... sister... I feel much... better now."

"Ahaha!" Luna cried, then composed herself, her grin turning into a sly smile.

"Now, Celestia, there's just one more thing you must do for me," she said. "As your mistress, I command it."

"Yes... mistress..."

"You remember the Celestia you used to be? The one who is sleeping, now, who has no memory of this?"

"...Yes..."

"Good," Luna purred again. "Forget her. Forget her, dear sister. You won't need her anymore."

"Yes..." Celestia breathed, "mistress."

And she felt that place, in her mind, where that Celestia slept, during teatime.

And she began to forget. With each thrust of Twilight's cock, that Celestia seemed to get further and further away, until...

Just like that...

She was gone, and all that remained was her. The broken Celestia. Her sister—her mistress's—slave.

"And now, my slaves," Luna said, "you may cum."

And they did.