Twilight smiled as Rainbow Dash followed her down into the basement. The shelves lining the walls were mostly empty, though what books were on the shelves looked to be as organised by theme as the upper library was. Rainbow could only guess what the themes were, and what books might end up filling the still empty spaces.

The centre of the room was the biggest improvement, though. Rainbow Dash had helped set up some of Twilight’s research equipment when she’d first moved in, but now the room was mostly adorned with seat cushions, as well as a table and some more lights. Twilight had turned the basement into a reading corner, a private reading corner at that.

Rainbow whistled, impressed. “Wow, you really livened things up in here.”

Twilight nodded. “I kind of thought I’d need some more private space for my new books. I wouldn’t want Spike to find any adult literature.”

Rainbow sat down on a pile of pillows. “You’re getting adult literature into the library? Really?”

Twilight sat down facing her friend. “Sure. How else am I supposed to research ways to help you?”

Rainbow smiled brightly. “So you’ll make me, you know…”

Twilight forced out a smile. “Actually, no, I don’t know. What is it you want, Rainbow Dash? It helps if you can word it for yourself.”

Rainbow Dash idly looked around the room, checking the high windows as well as the bookcases and some stray machines she guessed Pinkie Pie had once occupied. “I wanna come again. Hard.”

Twilight stared at her intently. “Just that? You want climax, orgasm, nothing more?”

Rainbow replied with a casual shrug. “What else is there?”

Twilight stealthily gritted her teeth before continuing with a smile. “Any particular fantasy you’d want to live out?”

Another casual shrug. “Just anything that lets me lose control, anything that gets me hot.”

The alicorn nodded. “Anything that lets you submit to a more powerful, more dominant pony, then. Is that right?”

“Yup. Anything like that is fine.”

Good to know. “All right, then, I think we’re ready to begin. Dashie wanna play?”

Rainbow Dash froze and gulped, a wetness formed in her loins and her heart skipped a beat. She could feel the heat building, a bead of sweat running down her neck. “W-wha? Aren’t you supposed to put me under first?”

Twilight marched confidently up to Rainbow Dash and gently pushed her down on the pillows. “We’re not doing a standard hypnotic session here, pet. You’ve already been so diligent to ingrain those triggers on your mind, I don’t really need to do that much to make you follow my words. Dashie wanna play?”

Rainbow whimpered and let herself slowly go down on the pillows, her eyes fixed on Twilight as her body submitted to the motions and tensed up with arousal. “B-but… I’m still gonna enjoy this, right?”

Oh, you’ll get your enjoyment, all right. If pleasure is all you care about, that’s all you’re going to get. “Of course you will, look at you. You’re already obeying, and I haven’t even given you your trigger to enter trance yet. I just want you to get nice and aroused so when you do enter trance, you’ll be far deeper than ever before. That’s what you want, isn’t it?” Twilight walked behind Rainbow’s head, keeping her wings spread to look more imposing.

Rainbow nodded. “Y-yeah. I want this.”

Twilight smiled triumphantly. “Excellent. Now say you want to obey.”

“What?” Rainbow frowned.

Twilight kept her voice sounding calm, but domineering. “Letting go and acknowledging your desire to submit will make it easier to go ahead with it. Just try it.”

Rainbow Dash took a deep breath. “I want to obey.”

Twilight smirked and tapped Rainbow Dash on the forehead. “Dive down deep, pet.”

Vertigo washed over Rainbow’s body. Her hooves felt heavy as lead, her legs turned to jelly. She felt her jaw unclench and her eyes flutter.

I’m… I’m passing out. Is this supposed to happen?

I want to obey. It’s true, I do. This is what it feels like to obey. This is what I asked for.

Twilight’ll take care of me.

So why do I feel scared?

Twilight leaned over. “Still awake?”

Rainbow’s mouth moved just enough to whisper. “Barely.”

Twilight nodded. “Good, the trigger’s working perfectly now. When I tap your head again, you’re going to let go completely and fall into deep trance. Understand?”

“Yes, Your Highness.” Wait, why did I say that? I only ever call her that when she asks me to.

“Dive down deep, pet.” Twilight gave her another little tap, and that was that.

Rainbow’s body went completely limp, wings sprawled over the pillows. Her mouth hung open, her eyes were firmly shut, and the scent of her marehood was leaking out once again.

Twilight’s nose curled. I’m really going to have to do something about that smell, ponies will notice if she gets this in public. Oh well, I suppose I can work on that later. First, let’s do some interior decorating.

Rainbow Dash stood in her control centre. The big pillar with the buttons looked as it had before, though there was less clutter about it now. The stray socks had been cleaned up, and the dust had been cleared, leaving the crisp smell of a well-kept library. The rest of the room looked better, too, more organised. To her right, the doll that represented her body and mind lay on a pedestal, and the needles that had been in it before were absent.

She carefully walked up to the pedestal, like Daring Do approaching her prize, except there weren’t any traps to dodge. Rainbow looked at the doll.

This is me, huh? This is what I look like to myself. This is how I can change what I am.

With barely a thought, the doll turned from Rainbow’s normal blue colour to Twilight’s purple. The doll’s mane turned from all the hues of the rainbow to Twilight’s mane colours, though there were still different shades of the same blues and purples throughout. A buzzing came from under the pedestal, and a compartment opened to make way for glass boards that rose up and folded around the doll’s space to make it into an exhibit piece. Rainbow Dash calmly stepped away and looked at the pedestal.

A sign appeared on it, sending tingles of pleasure through her.

“Property of Her Highness, Mistress Twilight Sparkle.”

Looking at herself, she saw the purple creeping up her hooves and displacing the blue of her fur.

Wow. I’m… Twilight’s now. I can feel her taking over me, all of me. Okay, that’s… that feels kinda nice, actually. I wonder if that’ll get even better?

With her hooves turned purple, Rainbow Dash walked over to the walls of her mental landscape to look at the posters. As she reached up for a Wonderbolts poster, the purple flowed up to her shoulders. She folded it up in a box and smiled as a poster showing her Mistress’s face appeared.

What did I just put away? A poster? Wonderbolts? What’s a Wonderbolt? Am I… am I starting to forget things? She looked around. Oh, I get it: Mistress wants me to clean up my head. Well, it can’t have been that important if I had to put it away.

The purple colour of her fur rose up to her belly when she took off a picture of her and Thunderlane, again replaced with a portrait of Mistress Twilight. Taking away a picture of Rainbow and Fluttershy at some place with a lot of butterflies made the purple soak into her tail. A stray thought nearly stopped her from taking down a picture of Pinkie Pie pranking her, but the purple kept on flowing up, taking over her neck. The same purple crept up the walls, pushing away the metallic blue that made the place look like a messy science fiction set.

Rainbow Dash looked around, her mental landscape now a shrine for Mistress Twilight Sparkle. A mirror appeared in front of her.

Rainbow Dash smirked. Wow. I look hot. All purple, with Mistress’s mane colours. Matches the doll and everything. Shame it’s not a complete copy, though. Oh well, guess there’s only room for one perfect mare.

Rainbow Dash picked up the box with the pictures, feeling the weight of her memories in them. She stepped through the looking glass and gasped as the vista unfolded before her. She stood on a vast white cliff, with the ocean roaring down below. With a deep breath to steel her nerves, she stepped to the edge and looked down.

The abyss was infinite, the waters would greedily keep whatever fell within them.

She gulped.

Okay, Rainbow Dash. This will be fine. Mistress Twilight is trying to help you.

She sat down and stroked her nether regions. The touch made her shiver and moan.

Hoo, tha-that’s a lot stronger than it was before. It’s working. I just have to obey, and then I’ll get to come.

I just have to be a good pet. Good pets obey, and good pets get rewards.

Mistress knows what’s best.

She held the box in her hooves and stretched her arms out before the abyss.

She let go.

Rainbow Dash smiled in bliss, a purple mare filled only with memories of obedience to her Mistress. She afforded herself one stroke, then sat and waited.

Okay. I did as Mistress asked. Now I’ll get my reward.

Nothing came, least of all Rainbow Dash. A sliver of fear crept into her mind.

Nothing’s happening. But Mistress would make sure I’m enjoying myself. I’ve finally let go of everything. She should be waking me up now, or filling me with more instructions.

Rainbow looked at her purple hooves. Mistress didn’t say she’d do this. She wasn’t supposed to be my Mistress in the first place. I-I was straight when I went into trance, wasn’t I?

Mistress wouldn’t do this to me, this is too sudden. I liked the Wonderbolts, I liked a lot of the memories I tossed away. Why did she make me throw them away?

Something’s wrong. Mistress is in trouble.

“T-Twilight?” Rainbow Dash opened her eyes and turned to stand on her four hooves, wobbling about in a daze. She saw Twilight holding her head in her hooves and crying.

Twilight looked up with a start. “Rainbow Dash? You weren’t supposed to… why did you wake up?”

Rainbow Dash rubbed her head, grimacing. “Umm, the trance, I think something went wrong. You went quiet after you made me throw away my memories, and I thought I heard you crying. I thought you were upset, or something had happened to you. A-are you okay?”

Twilight wiped away a tear. “I’m fine, I just… oh, what have I done? Are you still yourself, Rainbow Dash? What colour are you, in your mind’s eye?”

Rainbow squinted and looked at the floor, trying to concentrate. “Still purple. And all those things you made me forget, I can’t find them.”

Twilight walked over and tapped her on the forehead. “Dive down deep, pet.”

Rainbow Dash felt her jaw drop again along with her eyelids, her wings draped numbly on the floor and her rump went down to meet with the pillows.

Twilight kept that hoof on Rainbow’s forehead. “Okay, you’re obviously not fully awake yet. I want you to see yourself on that cliff again, pet. I want you to reach out for that box you threw away. It’s fallen deep, so deep, but it’s still in the water, and the water is in your mind. So the box is still in your mind, too. It’s right there, you just have to reach out and let it surface. Can you feel it coming to the surface?”

Rainbow Dash shook her head. “I dunno…”

Twilight pushed her hoof harder. “Feel my magic reaching out for it, pet. Your Mistress wants that box. Can you feel it coming back up?” Please don’t make me have to resort to a spell for this. Please tell me I didn’t screw up that badly, just tell me I don’t need magic to fix this.

Reluctantly, Rainbow Dash nodded. “Yes, Mistress.”

Twilight breathed a sigh of relief. “Okay, now I want you to take that box and put the posters back the way they were. As you do, you’ll feel the purple receding.”

Rainbow Dash grimaced. “Receding?”

Twilight nodded, keeping her voice as calm and even as she could, though the quiver still shone through. “Going away, flowing back like the tide. I want you to go back to your old self, pet. All blue, with a beautiful rainbow mane, and all her memories. Can you see yourself in the mirror again? Can you see the Wonderbolts, Fluttershy, and Pinkie Pie, all of them?”

Rainbow stood still for what seemed like an eternity, grimacing from time to time. When it was done, she smiled. “It’s all there. It’s all back.”

Twilight withdrew her hoof and sighed again. “Thank Heavens. For a second there, I thought I might have lost you.”

Rainbow winced and opened her eyes, looking sadly at her friend. Her stomach groaned, though her attention was centred somewhere lower. “You tried to make me into your pet, your slave. What’s wrong, Mist-“ She clenched her teeth together. “-Twilight? You don’t do that kind of thing, not to a friend.”

Twilight sat down and looked away. “I don’t know. I just wanted to help you with your problem, and then you had to go and make it all about the sex, I guess I just lost it. I’m really sorry, Rainbow Dash, I don’t know what came over me.”

Rainbow Dash cocked her head and held up a hoof, if a wobbly one. “One thing at a time. What were you planning to do with me once you had me?”

Twilight looked to the side and gulped. “I’d, um, I’d have sent a letter to Celestia to make you my new bodyguard, so you’d be my personal servant. I’d make it official, so nopony would notice you being around me all the time.”

Rainbow Dash perked her ears. “You were going to make me be with you, all the time? Really?”

Twilight nodded and wiped away the last of her tears. “Yes, really, and I’m sorry. I shouldn’t have done that, I don’t why I did.”

Rainbow kept her hoof up, if only to have something besides her arousal to concentrate on. “Hold on, Twilight, I still don’t get it. You don’t need a servant, and I know you’ve met plenty of stallions who’d do a better job at being your bodyguard than me. Actually, I’m pretty sure I introduced you to a few on that hurricane thing, so why me? What were you planning to do, like…”

“Sexually?”

Rainbow Dash nodded.

Twilight groaned. “I don’t know, okay? I don’t know what I was thinking or what I was going to do or why I was going to do it. I just think you’re physically attractive, is all. You’re strong, you’ve got perfectly outlined muscles, you’re flexible, and I guess I just wanted to have you to myself. There, I said it. I wanted you, I wanted to take you and keep you for some sick reason.”

Rainbow Dash narrowed her eyes. “Then why didn’t you?”

Twilight looked her friend in the eye. “What do you mean?”

“If you really wanted me that bad, why not use a spell? You know how to do it, you probably know how to hide it, too. Have you been lying to me?” Rainbow Dash leaned in, trying to catch her breath while sweat beads formed on her forehead.

Twilight vehemently shook her head. “No, no, honest. Hypnosis really does have limits, and I didn’t use a spell on you, I swear. I didn’t want to.”

Rainbow shrugged and averted her eyes. “Why not? It’d be easier.”

Twilight sobbed and wiped away another tear, anger rising in her voice. “I-I couldn’t, okay? I promised, and it didn’t feel right. I didn’t want you to be mine because I made you, I wanted you to be mine because you wanted to be. Do you have any idea how depressing it is to know the only way a pony will care about you is if you make them? That’s why I stopped when I did. I just felt this awful hollowness in my chest and it wouldn’t go away. I couldn’t keep going, I just started crying and then I couldn’t stop when I realised how badly I’d screwed up. I couldn’t do it, Rainbow, I just couldn’t.”

Rainbow Dash gulped and suppressed the urge to cry herself. She noticed a twitch in her wings, and one little vein at the base of her left wing was throbbing. She forced herself not to think about it. “I can imagine. That doesn’t make what you did right, though.”

Twilight looked up, eyes narrowed in thought. “But what about you?”

Rainbow raised an eyebrow, trying to still her pounding heart. “What about me?”

“You were just going to let it happen. I didn’t force you to listen or tie you down or drug you, you could’ve woken up anytime you wanted. Why were you going to let me take your life away?”

Rainbow Dash rubbed the back of her head and looked at the floor. She saw the dampness in between her hind legs and bit her lip when she realised she was still insanely aroused, so much so that ignoring it wouldn’t help. “Because it felt good. Having somepony take care of me, somepony who understands me, somepony I can just cut loose with for once, I want that now.”

Twilight let her head hang in defeat. “So you really do get aroused just from being dominated.”

Rainbow Dash groaned and stroked her marehood. “No, not just that. What you did just now, it wasn’t being owned that turned me on, it was knowing I wouldn’t be alone anymore. You’re the only pony I feel that good with.”

Twilight’s head snapped up, surprised. “Wait, what? That can’t be right, I didn’t put that in you. Why would you think of me like that?”

Rainbow shrugged, never taking her hoof off her marehood. Her wings twitched and throbbed as she moved. “Same reason you wanted me to be all yours, maybe?”

Twilight gulped. “Rainbow… does this mean we’re both attracted to each other? Does this mean we might be in love?”

Rainbow grimaced and idly stroked herself more. “I don’t know, Twilight. I don’t feel so good.” Something groaned in her belly, making her buck feebly.

Twilight strode over and put the back of her hoof on Rainbow Dash’s forehead. “You’re burning up. Your body’s all flush.”

“I wanna come, Twilight. I wanna come so hard, I’m sorry.” Rainbow Dash gritted her teeth and kept on stroking, one hoof now exploring her chest.

“Shh, it’s okay, Rainbow.” Twilight stroked her friend’s face. “It’s just your body acting up and your mind getting all confused, you can’t help that.”

Rainbow Dash shivered and nodded, her wings fully erect and stiff from the excitement. “I still can’t come on my own, Twilight.”

Twilight got closer and looked down at the moist marehood. “Do you trust me, Rainbow Dash?”

Rainbow Dash grimaced. “How can I trust you after what you just did?”

Twilight leaned in and whispered, putting a hoof to her friend’s most private spot. “Your mind is conflicted because you woke up too suddenly, Rainbow. If you can come, the afterglow will clear your mind and you’’ll feel better, standard magical banishing. I want to make this up to you, but I’m not going to if you don’t want me to.”

Rainbow Dash closed her eyes. “Okay. But do you know what to do?”

“I’ve read some books on the topic, yes.” Twilight came closer and gently pushed Rainbow Dash onto her lap, keeping the pegasus mare’s legs around her waist. “Just relax, and think about sexy guys, okay? Whatever fantasies you have, let those happen, and you’ll be back to normal in no time. And if you want to hurt me… that’s okay, too. Anything to get you back to normal.”

Rainbow Dash did as she was told and leaned back, keeping her front hooves on Twilight’s shoulders. She closed her eyes as Twilight gently let her down onto the pillows and started thrusting, rubbing her nether lips against Rainbow’s.

Rainbow tried to find the right images that would trigger her body. Thunderlane flashed through her mind, with his sweet smell and the adorable way she’d seen him care for his baby brother back in flight school. It didn’t do much for her. The image of an alicorn stallion came to her, a commanding presence that made her into a slave. It didn’t do anything, either.

She opened her eyes and saw Twilight grimacing and grinding against her lithe pegasus physique. Rainbow felt something give inside her, and the motion of wet lips against wet lips finally registered the way it should. Her body tensed as she felt Twilight’s soft flesh and fur rub and stroke against her own, sending ripples of pleasure through her. The muscles Twilight kept underneath that egghead exterior pulsed and throbbed ever so gently against the hard powerhouses Rainbow Dash had under her skin. It felt oddly comforting, even familiar.

It’s Twilight that turns me on. The other stuff doesn’t work because I just don’t feel it. I feel it for Twilight.

Rainbow grunted as her arousal built, with Twilight picking up the pace. The alicorn winced in what looked like a mix of guilt and shame.

Rainbow reached up and gave Twilight a nip on the neck. Twilight gasped, and Rainbow bit down as hard as her arousal and smouldering anger let her. Her back arched, her body tensed, and unlike their earlier sessions she could feel Twilight doing the same this time. Still Rainbow kept her teeth sunk in Twilight’s neck, just to get the anger out of her system.

They froze, though that didn’t stop their hips from bucking at each other or their fluids from coating the pillows below. Rainbow Dash held Twilight in a powerful embrace and bit down harder, making Twilight yelp ever so softly.

When it was over, Twilight went limp on top of her friend. Flustered, she quickly got up and pointed at the stairs, rubbing her now sore neck with a hoof. “Um, you’d better go and shower. If Spike walks in, I’ll tell him you crashed in some mud and splashed me.”

Rainbow Dash finally caught her breath and rubbed her head. It was still pounding, but she didn’t feel the need to fondle any part of herself, at least. And the need to submit had been purged for the moment. She nodded slowly, ignoring the mild pain she’d caused her friend. “Twilight, what are we gonna do?”

Twilight pointed to the stairs again. “Shower, now.”

Reluctantly, Rainbow Dash marched up the stairs, her back turned to the princess. “I mean after that. Are we lesbians now? Were you always one?”

Twilight picked up the pillows in her magic. “No, I don’t think I ever was.”

“But you did like doing what we just did?” Rainbow Dash turned her head.

Twilight let her head hang. “I did. And I know that’s wrong, I didn’t mean to force you into anything, well, sexual. It’s just that that’s the only way I know to fix the mess I made of things.”

“It’s okay. I let you, and I liked it. I don’t hate you, Twilight.”

Twilight groaned softly. “What about me trying to own you? You can’t pretend you’re not angry about that. Don’t tell me you bite everypony you like.”

Rainbow Dash shrugged. “Well, I am angry, and you deserved something for it, but so what? I’ve been upset with you before, you’ve been angry at me, it always turns out okay. I don’t wanna stay mad at you just because you did one bad thing without thinking about it, especially if part of it is my fault. And I can’t pretend I didn’t hear you say what you did, neither can you. So unless you plan on wiping both our memories, what are we gonna do?”

Twilight sighed. “There’s no point discussing this when neither of us has a clear head, so how about we just call in a break for now? No trancing, no trying to live out fantasies, we just take a step back and try to figure out where we stand.”

Rainbow nodded solemnly. “Okay. Time to think. Thinking’s good.” She exited the basement and went to Twilight’s bathroom. She switched on the hot water and let it run over her mane, before turning to let it clean off her tail and her private regions. Soon enough, the smell of her arousal was rinsed away. With her fur wet, she looked around for some soap. She uncapped the first bottle she found and took a whiff. Lavender. Of course it’s lavender.

After what had happened in her mental control centre, she decided against using that bottle. She heaved a deep sigh and just relaxed under the stream of water, taking a bottle of ‘Machete Jungle Fever’ soap instead, most likely belonging to a certain dragon.

Rainbow idly soaped herself up to get the events of the day off her mind. She breathed in the warm vapours and tried to block out the memory of her best friend’s arousal scents with whatever aroma Spike tried to impress Rarity with.

Just gotta get through this. Wash up, rinse off, go home, get some rest, do some thinking.

We can work through this, we’ve gone through worse. We just need time to think.

She groaned. Right, because I’m a really big thinker. Shouldn’t be any problem for a smart pony like me.

She let her head rest against the wall and felt her throat to check her heart rate. It was almost back to normal, along with her breath. The last physical traces of the life-changing events that had transpired mere minutes before were all but gone. She could just as easily pretend it never happened, and so could Twilight, once Rainbow was out of the shower. Rainbow Dash let off another dejected sigh.

This was supposed to be fun. Why did it have to get so complicated?

Author's Notes:

This chapter was hard. Not the first scene, not the hypnosis, but the aftermath got deleted and rewritten. Originally it was a two-way thing they did to clear Rainbow's mind, but that just didn't feel believable. It also focused on the chest area in terms of stimulation. Rainbow always bit Twilight, though. The shower thing was also new.

Next up is a Scootaloo thing, kinda short but should be good on the feels, as well as both parties trying to figure out where they stand.