One night, Twilight notices something odd as she's nestled in bed with Rarity: her hair smells different, just slightly. The next morning, her tea tastes a little bit less sweet, and the flowers outside smell somewhat less fragrant. Out at a cafe together, the music doesn't sound as sharp and clear, and Rarity's new dress feels marginally less smooth against her coat.

Twilight just wants to know what's happening, so she can fix it. It has to be temporary, after all.

Written for the Quills and Sofa Speedwriting group contest with the prompt "How will I break the news to you?"

Cover art by Koviry.

This story is a sequel to How Not To Use Your Royal Prerogative

  In an Equestria where the Sonic Rainboom never happened, Sunset Shimmer is the prized pupil of the Princess of the Sun. As Sunset struggles to make up for her past misdeeds and come to terms with the pony she wants to be, Celestia sends her to find the classic work The Application of Unified Harmony Magic from the Royal Canterlot Archives.
  Right after lunch, some meddling by her friends and meeting somepony with firsthoof experience of the Sunset she used to be.

Featured on Equestria Daily on August 18, 2016!
Appeared in the FimFiction Featured Box!

Cast: Sunset Shimmer, Moon Dancer, Minuette, Twilight Sparkle & Princess Celestia

Stories set in the Wavelengths Timeline in chronological order:

Origins Arc
The Alchemy of Chemistry
Bards of the Badlands
Grading on a Bell Curve
Habits of the Equestrian Phoenix
How Not To Use Your Royal Prerogative

Applications Arc
The Application of Unified Harmony Magics
Princess Celestia: A Brief History
The Cloudsdale Report

Dreamers Arc
Tactics of Snowbound Unicorns
A Study in Chaos Theory
Teahouses of Saddle Arabia
As the Raven Flies

Cover Credits
Cover Design by Amber Spark
Sunset Shimmer Vector by TigerBeetle
Pony SciTwi Vector by Osipush
Canterlot Bookshelves Vector by FavoriteArtMan
Sunset Shimmer Cutie Mark by MillennialDan

Beta Reader Credits
Ebon Quill - Worldbuilding Writer on The Manehattan Project
Quantum State - Technical Director of The Manehattan Project
The Albinocorn - Master of Sunset Shimmer Stories

Strongly Recommended Stories:
The Brightest and the Best by Pineta - The events in this story are considered to be completely canon to this timeline and explain Twilight's entrance exam to Celestia's School for Gifted Unicorns. I cannot recommend this story enough.
MLP Annual 2013 - "The Fall of Sunset Shimmer" - As above, the 8-page short comic in the beginning of the Annual is also considered to be canon, though with some major variations.

Version 3.0 Edit: Extensive grammatical and mechanics changes. Adjustment to timeline of Sunset's second mirror experience.

  In a world where the stars shine through both day and night, a savage attack upon the Phoenix Tower of Canterlot Castle leaves the city in chaos, a princess abducted and the stars fading from the sky.
  Now, Princess Sunset Shimmer dons the legendary Solstice Raiment and the Flareblades of the Sunmother in a desperate quest to save the glittering heavens and the love of her life.
  Because if the stars die... her world will soon follow.

Entry for FanOfMostEverything’s Imposing Sovereigns Contest
Prompt: Princess Sunset Shimmer - Warrior

Featured on Equestria Daily on April 9, 2017!
Featured on FimFiction on March 19-20, 2017!

Historian's Note: Set in the distant reaches of the multiverse, this tale is loosely connected with the events of SunLight Sliders, yet requires no knowledge of that story.

Cast: Princess Sunset Shimmer & Princess Twilight Sparkle with Philomena & introducing Faerana

Cover & Section Break Design by Novel Idea
Princess Sunset Shimmer & Princess Twilight Sparkle designs by Overlord Neon
Sunset Shimmer Cutie Mark By Millennial Dan

Beta Reader & Editor Credits
Ebon Quill - Audio Director & Quest Designer on The Manehattan Project
Tchernobog - AppleDash Fanatic, Special Guest Beta Reader
Little Tinker - Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Beltorn - Commenter-at-Large on FimFiction
Painted Heart - Wife of the Author

Special Thanks
Fahrenheit - For his invaluable assistance in creating an epic Elevator Pitch and Synopsis to fit the scope of this story!

Word Count: 15,000
Version: 5.2

Heavy is the head that bears the crown. Light is the heart that shares its burdens.

Historian’s Note: The Tarnished Crown occurs three weeks before the events in the Season 4 Finale, Twilight’s Kingdom.

Cast: Rarity & Twilight Sparkle
Introducing: Amber Spark

Cover Art: Little-Tweenframes (SciSetDaily)
Rarity Header & Section Breaks Design: Novel Idea
Rarity Cutie Mark: Black-Gryph0n (Yes, that BlackGryp0n)

Beta Reader & Editor Credits
Ebon Quill - Audio Director & Quest Designer on The Manehattan Project
Little Tinker - Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Beltorn - Commenter-at-Large on FimFiction
Cursori: Reader of Many a Pony Word
Monochromatic - Patron Saint of RariTwi

Word Count: 11,000 Words
Version: 2.6

In the middle of the night, sometimes waking up to a whimper is worse than waking up to a scream.

Cover Art: Little-Tweenframes (SciSetDaily)
Cover Text & Header Designs: Novel Idea
Sunset Shimmer Cutie Mark: Millennial Dan

Beta Reader & Editor Credits
Corejo: Lavender-Unicorn-Syndrome Counter Agent
Little Tinker: Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Beltorn: Commenter-at-Large on FimFiction
Cursori: Reader of Many a Pony Word

Word Count: 3,300 Words
Version: 3.3

  After Sunset Shimmer brings Sci-Twi’s strange magic-absorbing amulet back to Equestria, Princess Twilight Sparkle has a brilliant idea. If they combine the amulet and the magic of the portal, the two of them could hop between worlds at the push of a button!
  Who better to test out this fantastic new technology than two of the greatest minds in all of Equestria?
  They probably should have calibrated it first.

SunLight Sliders is the result of the Sunset Shimmer community's epic three-month collaboration project, where each author had three days to write a 500-1500 chapter in the ongoing saga of Sunset and Twilight Voyaging through the multiverse! Every author picks up where the last one left off... giving us one crazy journey in space and time!

Featuring the Talents of:
Novel Idea
NotSoWickedWitch
Tumbleweed
DrakeyC
Fuzzyfurvert
RQK
Marwile
TheNewYorkBrony
Sunsette
Oroboro
OddOneOut
Tchernobog
KalenNighteyes
Idsertian
ratedoni
Space Jazz
The Albinocorn
CoverArt
SciSetDaily/Little-Tweenframes
Dubs Rewatcher
Deathscar
EbonQuill
journcy
X3n0heart
RadiantBeam

Cover Art by the Astoundingly Amazingly Awesome SciSetDaily
Cover Text & Section Break Design by Novel Idea
Twilight Sparkle Cutie Mark by Intbrony
Sunset Shimmer Cutie Mark By Millennial Dan

Editor Credits
Novel Idea - Lead Editor & Project Organizer
Ebon Quill - Audio Director & Quest Designer on The Manehattan Project
Little Tinker - Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Beltorn - Commenter-at-Large on FimFiction

Special Thanks
To the entire Sunset Shimmer Group and all the commenters who embraced the madness of this crazy journey!
Tchernobog for constantly answering Novel's annoying questions about this exercise in lunacy.
The AppleDash Group for "At the Drop of a Hat" the original inspiration for this project!
Fahrenheit for his invaluable assistance in wordsmithing that fantastic synopsis and elevator pitch!

Word Count: 41,000
Version: 10.5

  As a dark threat descends upon the Diamond Wall of Canterlot, an ancient treaty forces the deerkin to come to Equestria’s aid once more. To the Royal Five’s surprise, a single ambassador is sent instead of the army Equestria so desperately needs.
  And yet, this unique magic-wielding deerkin may hold the secret to Canterlot’s salvation… assuming she ever stops flirting with the young Astra Princess Twilight Sparkle.

"Unofficial" Entry in Monochromatic's "Interwoven Colours" RariTwi contest.
Featured on EquestriaDaily on July 4, 2017!

Historian's Note: Set deep within the infinite possibilities of the multiverse, this new world is completely unknown save for a very select few. Which is to say, that no knowledge of any other story is required to enjoy the whimsy of this tale.

Featured on FimFiction: May 28-31, 2017!

Cast: Astra Princess Twilight Sparkle & the Lady Rarity
Co-Starring: Aurorae Princess Sunset Shimmer, Starlight Glimmer, Trixie Lulamoon & Shining Armor with a cameo by Radiant Hope

Cover & Section Break Design by Novel Idea
Virtrung Deerkin Rarity and Princess Twilight Sparkle by Jykinturah.

Virtrung Deer based on and inspired by the original concepts by Sirzi.

Beta Reader & Editor Credits
Ebon Quill - Audio Director & Quest Designer on The Manehattan Project
Little Tinker - Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Beltorn - Commenter-at-Large on FimFiction
Cursori: Reader of Many a Pony Word
Monochromatic: This is entirely her fault, just so you know

Word Count: 29,000
Version: 3.0

Twilight and Sunset race against the clock to save Canterlot from a foe of unimaginable power… a romantic narrative.

Entry in Aragon's Comedy (is Serious Business) Contest with the prompt Today We Learned Something "Subtle."

Cover Design by Novel Idea
Twilight Sparkle Cutie Mark By Intbrony
Cover based on screenshot from Black Mesa

Beta Reader & Editor Credits
Cursori: Reader of Many a Pony Word
Little Tinker: Master of Systems at Poniverse & Scripting Engineer on The Manehattan Project
Ladrian: Resident Snarky Mistborn
Heartshine: Smol Pegsus, BIg Heart
Oroboro: Assassin of Extra Spa ces

Word Count: 12,000
Version: 3.1

This story is a sequel to Diamonds Amidst the Stars

With the defeat of the shadowkin horde, the Diamond City of Canterlot rejoices under the soft touch of winter. With celebrations abound, Astra Princess Twilight Sparkle plans to make the most of it with the deer who stole her heart.

But, just as winter brings celebrations, so does it bring winds as frosty as the realization that the young Princess still does not have a name to define her relationship with Rarity and, more than that, a relationship she might be afraid to fully define.

Assuming Rarity stops flirting with her long enough to let her define it.

Historian's Note: Diamonds Amidst the Snow is set about six weeks after the Battle of Harmony Gate, chronicled in Diamonds Amidst the Stars.

Cast: Astra Princess Twilight Sparkle & the Lady Rarity
Co-Starring: Starlight Glimmer & Trixie Lulamoon

Cover Text & Header Design by Novel Idea
Snowbound Virtrung Deerkin Rarity and Princess Twilight Sparkle by Jykinturah and lilfunkman.

Virtrung Deer based on and inspired by the original concepts by Sirzi.

Beta Reader & Editor Credits
Beltorn - Commenter-at-Large on FimFiction
Cursori: Reader of Many a Pony Word
Monochromatic: It's a RariTwi Story. Of course I asked for Mono's help!

Word Count: 13,000
Version: 3.2

If there was one thing Twilight Sparkle had learned since ascending to alicornhood and becoming a princess, it was that ponies talked. Then, quite suddenly, they were talking about her.

And then they were talking about her love life since she was a single princess, unmarried and approachable.

She was still getting used to that part.

She was especially getting used to talking about it with Sunset.

5/14/2018: Now with cover art designed by the very generous Novel-Idea! Thank you so much!