This story is a sequel to Best Hell Ever

Once upon a time, Twilight went to hell. It wasn’t that bad. It was pretty great, actually. It had a library! A big one. Like, bigger-than-the-universe big. But then Twilight went and got herself kicked out of hell, and now she’s depressed.

There’s only one logical solution: with Starlight’s reluctant help, Twilight is going to break into hell and invade its library. Oh, it’ll be tricky — trying to find one specific location in an infinite dimension tends to be a bit hard — but the infinite knowledge it’ll provide is too good to pass up. Twilight will find that library if it kills her (which, since this is hell, isn’t the worst thing ever in the grand scheme of things).

There is absolutely no way this can possibly go wrong.

Suddenly finding herself in hell, Twilight is presented with one fact: for the rest of eternity, she's stuck in a library holding every book possible. She's expected to organize them and is allowed to read them.

What makes this hell, again?

Now has two Spanish translations, one by SPANIARD KIWI and another by Pugg-Senpai.

This story is a sequel to Aunthood Issues

Pop-cultural investigative reporter Coranto has heard some pretty out-there excuses for rumors. Some were even true. But when castle gossip says Luna has had a baby, and she claims she's created an entity to patrol dreams called the Tantabus, Coranto knows she's smelling a load of hogwash. The idea is absurd. Patently. Never one to let the truth hide, Coranto decides she will get to the bottom of these rumors, and nothing will dissuade her. Not anything Luna says. Not even the Tantabus itself taking an interest in her crusade.

...Wait...

This story is a sequel to Tantabus, Mk. II

The new and improved Tantabus has behaved itself thus far, but Luna has delayed telling Celestia about it. Until one night when it jumps into Celestia's dreams to say hi and inadvertently reveals itself. Luna must now introduce Celestia to her little bundle of self-aware psychic dream energy sooner than she imagined.

Trying to patrol the dreams of every pony in Equestria can be stressful. To ease her burden, Luna retools the Tantabus to turn nightmares into good dreams instead of vice versa. Aware of her mistakes from last time, she tests it out thoroughly, making sure there are no unexpected behaviors. And as far as she can tell, there are none.

Except that it's started calling her "Mom".

Faced with the prospect of possibly creating life, Luna seeks out Twilight's advice and assistance. With a little luck, they can get this all sorted out before the sun rises.

When Twilight needs a pardon, Celestia is there to provide. When Twilight doesn’t need one, Celestia still provides.

This story is a sequel to Rot

After the events in 'Rot', Twilight Sparkle has finally come to terms with her new self. Can she control her new powers? Can she ever have anything close to a 'normal' life again? And what happens when Discord's past mistakes come home to pass judgement on the 'new' Princess of Friendship?

Applejack's friends love her very much, which is why they must do the most painful thing imaginable:

Make her shut up about apples.

It turns out, the changeling invasion of Canterlot was very...improvised.

Trixie's line of work is dangerous. But she's a careful showpony, and that's why she's only died a few dozen times in her career.

She thinks this is normal.