Luna's has enough to deal with as Princess Twilight's student. Between nightly nightmares of moon princesses and the threat of an old enemy returning from Equestria's past, Luna isn't going to be getting any sleep any time soon
My sister is an idiot. Her faithful student, Twilight Sparkle, appears to share her stupidity. Luckily, I am here to lend them a helping hoof. I can't /really/ blame them, though. They're so /adorable/ when they're clueless.
Finally, Roseluck's special project is complete. Now, it's time for her to request an audience with Princess Luna, and see if her rose really does give her luck.
Luna takes her job very seriously. When she hears there's a human having difficulty sleeping, she decides to share a bed with him until he feels safe and happy again.
A strange condition has Twilight courting death in the wake of her battle with Tirek. Now her life depends on Luna, and both lives will be affected. Hopefully for the best.
Twilight is angry. Normally, a more calm approach would be useful, but when a pony... When a pony commits THAT, well, the chips are off the table. Justice must be extracted.
Sequel to The Celestia Code. When the monsters created by the dark crystal engine escape their prison, it's up to Princess Twilight to deal with them. She gets help and advice from Princess Luna, but things don't go as planned.
On behalf of her sister, Princess Luna tries to elevate the studies of her new student, Twilight Sparkle. However, when their plans backfire, they find themselves in a new world where magic is lost, and then have to survive the turmoil in its place.
Spike is the guest of honour at a high society party important to the Council of Friendship. It'll end in political disaster if he doesn't find a date for the dance. Luna magically disguises herself as his date but ends up stuck in her new form.
After her emotional revelations to Twilight Sparkle, Princess Luna returns to Canterlot uncertain of her feelings, her place in the world, and even her identity. Her big sister tries to help her feel a bit less adrift.
After the wedding of Shining Armor and Princess Candace, Princess Luna tries to decide how to tell Twilight Sparkle about her feelings for her, but things quickly take a different, but interesting turn...
Even when there's no light at the end of the tunnel, that doesn't mean you can't keep moving. Luna finds it within herself to put one hoof in front of the other, as her immortality melts away.