This story is a sequel to Normal Life

Cause and effect. Opposite and equal reactions. If a butterfly... You know how it goes. The point is that your actions, large or small, have consequences. If they turn out good or bad is often not up to you. Especially when you live with the Princess.

But fear of the consequences is not a reason not to act when you need to.

Next story can be found here: https://www.fimfiction.net/story/361744/secret-of-flying

This story is a sequel to Sunset Shimmer Lends Pinkie Pie the Wrong Thumb Drive

Sunset Shimmer visits the Castle of Friendship, and inadvertently discovers something that Twilight would normally keep hidden under her bed... except that since this is a pony princess we're talking about, it's obviously nothing remotely resembling normal.

Rated Teen and Sex for discussions of pornography and self-love.

Twilight Sparkle never seemed to notice Lyra Heartstrings. She didn't even remember Lyra's name.

They were friends back in Canterlot and even went to school together. Yet Twilight didn't notice that Lyra just happened to move to Ponyville the same day she did. She didn't even notice when Lyra appeared at her welcoming party. Nor did she ever seem to spot her old classmate passing by in the background on any other day during her stay in Ponyville. Some days she could look right at Lyra and never realize that they knew each other.

Lyra isn't a very noticeable pony. She has put a lot of effort into that.

Set in late season 5, after Amending Fences.
Note: Lots of spoilers in the comments.

Princess Celestia, who is feeling a little lonely, asks Princess Cadance for a little help in finding a special somepony.

Along the way, Princess Celestia rediscovers herself.

An entry in the Weedverse.

One day, Twilight Sparkle discovers something amazing about her friend Sunset Shimmer.

She's a magical talking pony!

This requires investigation! Science! Possibly a full-body physical!

Or maybe Twilight will just ask her what's up with that.

Rated Teen for frank discussions about... y'know.

This story is a sequel to Trixie Lulamoon and the Horrendous Hypothesis

Enter the Dragon is an in between story and is recommended reading.

Princess Twilight Sparkle has a school for gifted foals. Some of them are fantastic. One of them had a Horrendous Hypothesis. All of them will be learning Princess Twilight Sparkle's curriculum for friendship.

An entry in the Weedverse.

Wut?

Family portrait

The stupid goes flying right out of Sumac's head.

Majestic!

Twilight Sparkle is an expert in unicorn magic, but earth pony magic remains a mystery to her. The books in her library have very little information about the earth tribe's abilities, other than their famous strength. Twilight is determined to uncover their secrets.

What she learns will change her life.

And it just might change Applejack's life as well.

Featured on Equestria Daily.

For years, Twilight Sparkle and Queen Chrysalis have been at each other's throats. Both have experienced victory over the other, and both have experienced defeat. Out of all the creatures in Equestria, none despise each other the way the pony Princess and changeling Queen do. They seemed destined to remain locked in battle forever, or at least until one is finally dead at the hooves of the other. The cruel insults, the vicious loathing, and the powerful spells that have passed back and forth between them at each meeting have become the stuff of legend.

Imagine Twilight's surprise when she finds out changelings consider this dating.

And now they're married.

***

Sequel: Pony Courtship Rituals

***

Some beautiful fanart of the end of chapter three was done by Dmann892; you can see it here.

More awesome fanart, this time from chapter one.

Now with a TvTropes page (obligatory TvTropes warning goes here).

If you want a Russian translation, you can find it here.

There is now a reading of the story on Youtube, which starts here.

This story is a sequel to Trixie Lulamoon and the Horrendous Hypothesis

After tragedy strikes, Twilight Sparkle and Spike the Dragon wind up with a dragon egg in their care. In a discussion about what should be done with the egg, much is said about pony and dragon relations as both Twilight and Spike reflect back upon their time together and their relationship.

An entry in the Weedverse.

This story is a sequel to A Different Perspective

Both the House of Path and Herd Path enjoy strong growth in the years following their establishment. Like all such things though, they both have their highlights and lowlights. These are vignettes in the lives of the children of Twilight, Path, Free, & Roseclaw, from foals to young adults.

This is a series of stand-alone stories of events that occur after the events of A Different Perspective, which I strongly recommend that you read first.
My collaborator, AlaskaIsCold, has written some of these and I mostly just edited them.