"Rainbow! I'm cumming! I'm cummiiiiiiiing!"

As soon as she heard Twilight's warning, Rainbow stopped the movement of her head, sealed her lips around the midriff of Twilight's horn, and attacked the top of it with furious licks of her tongue. Groaning ecstatically, Twilight blasted another load of magical fluids into her friend's maw. With ease she gulped down spurt for spurt till the horn stopped twitching. Then she sucked the last drops out of the horn before she left it with a very satisfied expression on her face, cherishing the leftover taste in her mouth.

She took a tissue from the table next to the bed the two ponies laid in, and cleaned the unicorn's glowing horn, as Twilight was too exhausted to do it herself. She threw the used tissue away and pulled the blanket over herself and Twilight, snuggling closer to her, sighing happily and causing her friend to smile, as she too snuggled back.

“Why did you want me to say those words anyway, Rainbow?” Twilight asked curiously, closing her eyes as she enjoyed Rainbow’s warmth.

“Because for one, it gives me a nice warning, and for two, your sexy cries are always so adorable whenever I push you over the edge, Twi.” The unicorn nudged her friend with her elbow in the side, huffing playfully. The pegasus giggled at her cute reaction, pulling her closer to her chest and digging her snout into her silky mane to smell her luscious scent, prompting Twilight to giggle in return.

Five days have had gone by since Rainbow moved in with Twilight to receive her daily "medicine" from her. By now they were used to sleeping in the same bed and cuddling with each other after each treatment. It hadn't been easy, though. Besides getting used to living with each other, they had to make sure that Spike wouldn't see them whenever they had their horn-sucking sessions. While most of the time it had been easy to get Spike to leave for some errands, one time he had almost caught them, as he returned earlier than expected. Twilight and Rainbow had jumped into the closet, waiting with beating hearts and burning faces for him to leave the room. Because Spike took his time, Rainbow couldn't wait any longer and started to suck Twilight off in the closet.

The unicorn had been so scared that Spike would hear them and find them in such a position, in the closet no less; yet they were in luck, as the CMC came by and asked Spike to play with them, just when Spike had thought that he had heard Twilight somewhere. Rainbow apologized afterwards, but she added to her apologize that this had been the biggest treat Twilight had given her since the first time. It's why they had done it outside too, for testing as Twilight said, not because it gave them a kick by the chance to be caught in the act. Turned out that Twilight's arousal played a great deal in the size of the magical fluids she could produce. But they kept it at that one time as it was too dangerous for anypony or even their friends to see them.

Rainbow and Twilight usually had three sessions per day, in which Rainbow pleasured Twilight's horn to get her magical treatment and heal her invisible wounds. After five days her feathers had become almost completely purple, a fact which their friends had exploited greatly to make fun of them, only the middle length of the feathers had a silver shimmer. Rainbow was not as unhappy with this detail as Twilight had suspected, she even asserted that she liked this color more than the silver one, which Twilight was very happy to hear.

Rainbow's feathers weren't the only reason why their four friends teased them every now and then; they had also noticed that they behaved more and more like a couple over the past few days. The two ponies had gotten much closer in those five days, sharing more intimate and personal moments, than they had in the past months since they first became friends.

Twilight knew that Rainbow was an only child with only one parent left, her dad: a retired Wonderbolt who "was my first inspiration to become a great flyer, just like him." Rainbow knew of Twilight's family: her BBBFF, and that her dad worked as a magic engineer, and her mom the author who wrote the famous Daring Do series. A series which Twilight and Rainbow enjoyed in each other's company many times over the last days. Twilight had the suspicion that her magic had not only given power to Rainbow, but also some of her own behaviour and preferences, though that was hard to prove, and only a theory the unicorn didn't share with her pegasus friend. She was too happy to have a book buddy, even if she only liked to read and talk about Daring Do.

But reading sessions hadn’t been the only activity they had been doing together. Outside they were often seen together, training Rainbow's flight, who improved from a filly's level to that of Fluttershy’s rapidly, yet Rainbow had yet to reach her own level again. Besides the training, they went out for dinner, walks, and watched a movie together. And once Rainbow was strong enough to fly and carry a pony, they watched the stars on the clouds, after Twilight had cast the cloud walking spell on the both of them.

They spent time with their friends as well: playing games, meeting for lunch, and talking about Rainbow's progress. The others did wonder, though, since Twilight and Rainbow didn't want to have a sleepover at Twilight's home. They didn't know that it was because they didn’t want anyone observing their sessions, which was why they began sleeping together in the first place. In the second night Rainbow had stayed, while Spike was away for a sleep-over with the CMC, the pegasus had snuck in Twilight's bed and convinced her to give her a "midnight snack." After said snack, Rainbow was too full to go back to her own bed, and Twilight was too tired to chase her friend out. Rainbow then spooned Twilight, wrapping her wing and hooves around the purple mare, enjoying her warmth while Twilight appreciated the pegasus’ affection.

Not only at home when they were in private did they show signs of affection to each other. There had been occasions in public where some ponies or one of their friends stumbled over their actions. When they had left the cinema during late evening, Twilight shuddered at the sudden coldness. Rainbow pulled her wing over Twilight and held her so close to her that not even a grass stalk would have fit in between them. Though not many ponies were on the streets when Twilight and Rainbow returned home, those who saw them would later gossip about it; which would eventually reach Rarity' ears, who would tell the rest of the gang about this sensation.

And they could see those rumors for themselves happening right in front of them. During one of their meetings while eating some sweets from Pinkie and apple cakes from Applejack, Rainbow had been eating so messily that her mouth and cheeks had been filled with crumbs, sugar, and marmalade. Twilight berated her, and wiped her face clean with a tissue; yet there was a stubborn marmalade stain that didn't seem to want to leave Rainbow's blue fur. The orderly unicorn rolled her eyes, leaned forward, and licked Rainbow's cheek clean with a slip of her tongue. This action caused the rest to stare with wide eyes and jaws at the two while Rainbow had to fight both her blush and threatening wingboner. When Twilight asked why they had all seemed so shocked in her confusion, a general coughing occurred in the circle, and the topic was changed quickly.

Besides those events, both Twilight and Rainbow noticed some things about each other; quirks and perks they hadn't taken notice of before the incident.

Rainbow noticed that no matter how tired or busy Twilight was, she would always find the time to water the plants, feed Owlowiscious, and make sure that Spike was timely put to bed after having brushed his teeth and washed his hands. Twilight was surprised to find out that Rainbow could actually cook quite well, as every morning she got breakfast brought to her bed by her guest, and when they cooked together it was Rainbow who would give her tips Twilight hadn't found in her cooking book, but were useful nonetheless.

You would think that the bookish unicorn and the action-loving pegasus would sooner be buried beneath a fallen roof then become such close friends. Yet both enjoyed the other's company very much. Twilight saw another side of Rainbow, the mushy and adorable one who would blush whenever she nuzzled her after one of their sessions. Rainbow found out that Twilight could be quite mischievous and cunning whenever she paid the pegasus one of her pranks back. But most importantly, they noticed something about themselves and their own emotions: that they were drawn towards each other and felt an attraction which grew stronger everyday. An attraction which was no longer content with sucking and licking horns or snuggling afterwards. It carried a need for more, and this need was constantly in their minds, demanding gratification; as it had the day before.

Yesterday, Twilight and Rainbow had their home to themselves again, as Spike had gone off to a sleep-over at Rarity's place with the CMC. Though he had been grumpy, and curious as to why they wanted him out of the house so much, the prospect of sleeping under the same roof as his beloved Rarity was too good to pass up. And so the two ponies had settled down in a comfy position together under a blanket at the fireplace in the library. They drank hot chocolate, and talked about the funny rumors about the two of them, and how Rarity was thinking about adding some "couple’s item" to their dresses. While laughing they had come even closer to each other’s sides, feeling the heat of their bodies, and smelling the scent of creamy chocolate in each other’s breath.

Over time they had gotten used to nuzzling each other before the horn sucking sessions; some sort of friendly and caring affection, not too intimate but also not merely friendly. This time their nuzzling and strokes ended with their heads coming closer and closer, eyes half-lidded, their minds in disarray with emotional need. Their lips met in a kiss, lasting only a couple seconds and only pressing lips on lips. Twilight and Rainbow broke apart slowly, watching the other's reaction for any sign of opposition to what had just happened. They found much in each other's glossy eyes, but nothing that opposed to the act. And with this, they threw their worries and fear over board and embraced each other in a deep kiss - tasting their love, moaning and gigglingly happily. It was the start to a night in which so much more than just hornsucking would take place.

Twilight had not casted off the spell on her horn since that time, nor had she left the house with her glowing horn. Now it was afternoon, and Rainbow had just sucked on Twilight's horn for the fifth time - 2 times during their sweaty night together, another time after brunch on the kitchen table, and another time later when they had taken a shower together. More times in less than a day than they ever had done before.

Smells like we're in need of another shower again. Twilight thought with a grin, feeling the soft movements of Rainbow's chest on her back. The horn spell had been proven to be quite useful to Twilight to keep a secret from Rainbow. After the second time Rainbow had sucked Twilight's horn, this time with less awkwardness between them, Twilight had cast of the spell while Rainbow admired the purple hue along with her silver feathers. Everything that had happened that first time had repeated itself: Headache, pain inside and everywhere else in and on her body, a sting going through her mind like a knife through butter.

Thankfully, she had been composed well enough to convince Rainbow that her pained sound had been one of shock because she believed Rainbow would dislike those purple feather in her wings since she had found the silver ones so cool. To which Rainbow replied that purple was even cooler and she loved it very much, which gave Twilight the perfect opportunity to tease Rainbow and made her too busy blushing to think much longer about Twilight's pained squeak.

In the morning, Twilight noticed silver hair in her mane as she brushed it. While she could conceal them easily on the first day, she already knew it would be much harder to hide them in the days to come. So she bought dyes in secret, and hid them in the bathroom. She also bought medicine which she hid in various places in her home whenever she would need to cast off the spell of her glowing horn.

The next days Twilight would find a way to be alone after every session, in which she would press her teeth together and endured the pain while cancelling the spell. In the night, she would wait for Rainbow to fall asleep before she snuck out of their embrace. In the day she would motion her magically powered up friend to fly outside and show their friends the results. Other times, she would excuse herself to the bathroom, and activated the shower to muffle her groans of pain. The one time they had been outside Twilight had lied that she had to “go to the little fillies’ room,” to bite on her hoof in the bushes until the spell ended.

Twilight's aura had been strained every time Rainbow had received a load from it, the unicorn could feel it being stretched like gum. It hasn't popped yet, but she knew it would not be healthy if she kept this up for much longer. And then there was this slight problem that after the two times right after each other, Twilight had been too exhausted to cast off the spell and fell asleep. When she woke up, she didn't find a way to get Rainbow away from her, who had been at her side constantly, showering her with kisses.

And after the third time right after brunch, Twilight had been too scared to cast off the spell, fearing the results. A fear which had grown by the fourth and fifth time, yet she had denied to cast off her spell whenever Rainbow asked her why she still had it on. The unicorn excused it with the Grand Galloping Gala happening in two days, and that Rainbow would need as much magic as possible to have a chance to reach her old level and impress the Wonderbolts; an argument that their biggest fan could hardly argue against.

But now, Twilight was debating in her mind if she should come clean to Rainbow and call Celestia to help her with the on-going spell and it's built-up magical feedback, waiting to leave its marks on her aura.

"Twilight." Rainbow called her name, a wondrous tone in her voice.

"Hm?" Twilight was too distracted by her thoughts to pay this sound much attention, but when Rainbow gripped her chest stronger in growing excitement, the pegasus had her attention.

"Twilight, I think, I'm healed!" At this point Twilight turned around, looking with incredulity in rose eyes which swam in tears of joy and happiness.

“Really?!" Is it true? Is it over? Is Rainbow's aura really completely restored?

"Yes, my feathers didn't became hot, nor did my wings tickle like usual." Rainbow wanted to move in for a deep kiss to the pony she owed so much, everything, for all the deeds she had done for her. I would need more than a lifetime to pay her back in full. Without her, I would have never been the pegasus everypony had known me for. But Twilight moved her muzzle aside, causing Rainbow to miss her lips.

"Are you sure then? This doesn't have to mean that you're fully healed." Rainbow sat up and spread her wings for her selfless donor to see that all silver feathers had turned completely purple. This sight made Twilight sat up excited as well, flung her hooves around Rainbow to hug her while she rejoiced for the amazing news.

"Oh, Rainbow! You might have really recovered all of your aura!"

"Pff, "might"? I know just the right test to prove that Rainbow Dash, best flyer of Equestria, is back to her old form. I will do a Sonic Rainboom. Now!"

Twilight left the embrace to stare at Rainbow, not sure if she was serious, given that yesterday before dinner Rainbow could just fly with 8.9 wing power, hardly the speed to achieve something as impossible as a Sonic Rainboom. Then again, Rainbow had proven twice that she had done the impossible, if she felt ready to do it a third time, then Twilight didn't feel it would be right to argue against it. Plus, seeing Rainbow so confident and almost bursting with positive energy, made her own worries raise up in her mind. Rainbow noticed that something did not sit right with the pony before her.

"Twilight, what's the matter with you? Why do you look... so scared?" Twilight cringed when Rainbow caught her apparent fear. She looked up, still undecided if she should tell the mare her heart beat for or not. "I...I am scared, Rainbow. I..." But could she tell her now? What if Rainbow didn't succeed at her own test? What if she still needed some of the unicorn's magic to regain all of her aura till the time she could meet the Wonderbolts?

"I... I'm scared about us. About what will become of us, now that... that you don't need me anymore." A lie which wasn't entirely false. The two ponies hadn't talked about them and their relationship since this most passionate and wonderful night together. But while Twilight knew of Rainbow's dream to become a Wonderbolt, her own duties as the princess’ protegé, and of them being so close for such a short time; her entire being hoped with every fiber of her body and essence of her soul that Rainbow would be ready to give them a try. As a couple.

Rainbow smiled lovingly. She cupped Twilight's head gently and gave her a soft kiss. "Twilight, look outside when I fly. You will see your answer in the sky."

Twilight smiled and nodded in reply, glad to have kept her true fear a secret. I can deal with this myself. I can confess everything and apologize for my selfishness once it's proven that Rainbow's aura has healed.

Rainbow grinned, beat her wings to gain altitude and flew outside through the open balcony door. Twilight sighed and used her magic to bring forth the painkillers hidden under a secret stash under the bed. A glass of water and a couple pills against nausea would be enough to fight off the side-effects of the magic donor spell, or so she hoped.

She looked at her meds prepared so many times the last days. Maybe this time will truly be the last one. She closed her eyes and cancelled the spell, the glow in her horn disappeared.

In the tenth of a second, Twilight's aura was shredded.

Pain, pain was everything Twilight could feel. So much anguish that the only reason she didn't scream out was that her mind was blown with the cruel and horrific kinds of hurt she felt her soul and body being tortured under.

Her horn was under attack as if somepony tried to saw it off and hack it out with an ice pick at the same time.

Her mane and tail were on fire.

Her brain cooked in her aching skull, her eyes dried out, her tongue felt as though it was being stung by a thousand needles.

Her throat was choked by an invisible force, her lungs burned as if boiling oil had been pumped into them.

Her heart was ripped apart slowly with rusty talons.

Her bones were each crushed again and again by sledgehammers till only dust was left.

Her guts were freezing, expanded in size and exploded in frozen bits inside her body.

Twilight threw up. She vomited her brunch and bile on the wooden floor, her insides churning while her mind was in panic, trying to figure out what had happened to her, not able to grasp a single sane thought under the wrath of the pain she still felt inflicting her. Her panicked look gazed back at her in the mirror, seeing blood-shot eyes and dirtied lips for a second, and a streak of silver hair in her hair, looking beautiful and ridiculing at the same time. An intellectual, scientific voice used this as evidence to whisper that her body was fine, that she was not physically hurt, that this was all done to her soul, which broke her aura and thus hurt her body without any injury shown. But this thought did not calm her fear, as another wave of pain flooded her body.

Twilight rattled desperately, trying to gasp for air that kept pushing out of her lungs as her body winced and churned and trembled in the boiling sea of pain she had found herself in.

She heard ponies cheering outside, as Rainbow had gathered her friends and with them the other residents of Ponyville, who all wanted to see Rainbow Dash fly the Sonic Rainboom. They all had heard rumors about her inability to fly like she usually could, so they were curious as to how accurate the rumors had been. Hearing the shouts calling out Rainbow's name was like a beacon to the drowning Twilight. Her darting eyes set on the balcony, she staggered towards the sound, to the outside, to where Rainbow Dash would be.

Ba-bump

All Twilight could think about was to lean her aching head on Rainbow's chest.

Ba-bump

To feel her surprisingly tender hooves stroke her mane and back.

Ba-bump

To hear her husky voice call her name so lovingly that it warmed up everything inside Twilight.

Ba-bump

To tell her that she loved her more than anypony else under the sun and moon.

Ba-bump

Twilight had reached the balcony. She raised a hoof, reaching out to the pony whose love would surely sweep away all of the pain. So far away. "Rain-"

Ba-...

Rainbow Dash had waited patiently, flying steadily above the plaza which filled itself with hundreds of ponies with every passing minute. A worthy audience of her third Sonic Rainboom, yet the most important viewer hadn't shown up yet. The pegasus kept looking towards the library, waiting for her most beloved to enter the balcony. Everything inside her screamed to use those wings and fly, to show who's the best flyer in Equestria and why her name would go down in the annals of the Wonderbolts once she became part of them. Yet Rainbow silenced those voices with the simple thought of imagining Twilight's face. All of this meant nothing if she couldn't show Twilight her answer in the sky which meant so much to her, yet not as much as her friends and never as close as what she felt for this bookish unicorn.

The pegasus could see it: A bright future of her and Twilight being together. The fun conversations they would have in the evenings after the exciting adventures they survived everyday. The laughs and smiles, the hugs and kisses, the silent eye confession and the mouthed ones; even the fights and tears. All that Rainbow had seen in her future. She had seen it yesterday in the violet eyes of her soon-to-be lover and she was determined not to let this life escape her hooves.

Yes, such a life, this life with you, Twilight. I want it and we will get it. Together.

Her eyes caught sight of a purple spot on the balcony. She could even see how it raised a hoof, waving at her. Rainbow felt her heart soar, and as if it had been the starting signal she shot upwards into the sky. She flew as high and as fast as she could. It would have been easier to just fly towards the ground to gain more speed thanks to gravity, but for the kind of Sonic Rainboom she had in mind, she would need to create it while flying up.

She moved her hooves forward, feeling energy sparkle on their tips. The air rushed through her feathering and rustled her coat. Her heart beat in rapid strokes as blood and adrenaline rushed through her veins. Her insides were tingly with the happiness spreading out in every cell of her body. It felt so good to be able to fly again like she had been used to. And yet this was not the reason she enjoyed flying so much this time.

There it was, the familiar sound of crackling and sparking. Rainbow gave it her all and closed her eyes. A booming sound was heard behind her as she painted a rainbow-colored circle on a blue canvas, the sky. Her Sonic Rainboom had succeeded. Quickly, Rainbow made a sharp turn, losing speed by doing so, but regaining it quickly enough as she flew back towards the Sonic Rainboom. She focused on what she aimed for, the void circle in the center of her fantastic creation. Once she saw she was close enough to it, she flew a sharp turn down, then up with two waves following, repeating this figure over and over again.

When Rainbow felt her head become fuzzy from the constant movement, she flew away and slowed down to watch her masterpiece. A Sonic Rainboom, with a rainbow-colored heart inside its usually empty circle, an impossible trick made possible, which would be seen for quite a while before it vanished. More than long enough to be seen by and for the reason she had done and enjoyed this flight more than any other before in her life - her message to Twilight Sparkle.

There you have your answer, Twi. No way, she can’t see this one.

Everypony watched the Sonic Rainboom with its rainbow-colored heart inside it spread far on the sky, awed by the amazing view before they broke out in cheers. Rainbow's friends smiled joyfully, knowing that their friend had been fully healed and that everything had gone fine. Spike and the CMC jumped up and down, shouting Rainbow's name as loud as they could. Spike left them and ran to his home to congratulate Twilight on her success in healing Rainbow, and of course to prepare the letter they would send to the Princess right away, telling her of this amazing feat.

Only one did not saw this beautiful spectacle, though it had been done just for her. Twilight Sparkle laid on her balcony, eyes closed and body unmoving, silver hair glittering in the warming sunlight of a most wonderful day.

Author's Note

First, I want to apologize for the first sentence but it was too good of a chance to pass it up. The image of Twilight shouting "I'm cumming" over and over again while Rainbow licks and sucks her horn was too rich, not to be included in the story. XD

Second, I want to thank Neuromancer65 and Odycay for proofreading, thank you very much. Especially Neuro for coming into the chat when I added some new parts to the story. :)

Third, I'm sure you noticed a big timejump here with the five days. I apologize to Dashie98 and anybody else who would have liked to see this go on for a couple more chapters. I could have written about those dates, how their friends reacted to their clearly changing relationship and what they talked and felt during those times.
However, such dates and events have been written a thousand times and more in Fimfic and I felt I wanted to try out a more "narrator" kind of approach as shy sad jaded zarvuk had pointed out my stories are mostly character driven. I'm not sure if I did the telling in the beginning right, but this summary of what happend those five days and especially yesterday was to see if I can go and tell a story without involving characters talking much.
Plus this way I could write down the story in lesser words then if I had written a chapter for every day Twi and RD had spent together till now. Also so I could get faster to the part where Twi's spell gets her a massive magical feedback and where RD flies her Sonic Rainboom followed by a Rainbow heart in its center as an answer/message to Twilight. Who sadly hasn't seen any of it.

Oh well, not all relationships can have a perfect start, right? XD

Thank you very much for reading, chapter 5 is still in process of being written. If you want me to speed up the writing pace I got slap me in the face in the comments or kick my butt or whatever you think will motivate me to write faster. :P