Love can strike when you least expect.
Sometimes it’s just when you see an old friend in a new light.
This is what happened to Princess Luna and Rarity, both of whom admired each other, but never in a romantic way.
All that was destined to change.
It was written in the stars.
Luna x Rarity

This can be read as a stand-alone story or continued to its sequel Luna's First True Love, when we find out about the mysterious pink unicorn in Luna's precious oil painting.

There is another sequel, A Hearth's Warming to Remember, that follows Luna and Rarity to their first Hearth's Warming together.

The last time Luna and Celestia met there was an argument.

That would be the last memory that either would carry of the other as they faced separate futures that would never cross again.

If only it had been different.

Celestia is feeling down and Luna recognises that what she needs is a bit of romance to bring a little sparkle into her life.

Could this be the dawning of a closer relationship between Twilight and the Sun Princess?

Angel Bunny forces Fluttershy to go out on Nightmare Night when she would much rather stay at home, but a chance encounter with a chivalrous Bat Pony soon brings a blush to her cheeks.
Even Zephyr Breeze inadvertently helps bring the couple together and somepony gets a new hairdo!

Why didn’t Princess Luna come to help fight off the Changeling invasion during Shining Armor’s wedding to Princess Cadence?

Now we know – she was having a few problems of her own in an alternate universe where Nightmare Moon ruled unchallenged!

While consoling Rarity following the break-up of her most recent affair, Rainbow Dash lets slip by accident that she has held affections for the beautiful unicorn for years, but once the secret is out how will she react and what does the future hold?

The Mane Six all felt drawn to the Mirror Pool where they witness the arrival of a pair of glamorous silver and gold alicorns. They soon show they are not as beautiful as they appear to be, but why did they come to Ponyville and what has happened to Celestia and Luna?

This story is a sequel to Above All Others

Princess Luna and Rainbow Dash had been together as a couple for the last few years, and in this time Rainbow had been promoted to Captain of the Wonderbolts.  During a flying display she suffers a near fatal injury leaving the Princess of the Night with no easy choices.  What price would Luna be prepared to pay to consummate their love?

Set in a time after "Call of the Cutie" and before "Magical Mystery Cure", this story results in a departure from the Friendship is Magic timeline and leads into an Alternate Universe.

Twilight finds an orphaned foal in the Everfree Forest and adopts it as her own, but Celestia establishes that this bright young life is not long for this world. She is faced with the dilemma of what to tell her student, but even she cannot know the serious implications of her decision.

Fluttershy’s not feeling well, so Pinkie Pie goes to Zecora to find a remedy.  Unfortunately, the Princess of Randomness accidentally gets things mixed up and truths start to come out that some ponies would rather have kept hidden …