Sweetie Belle wonders if she can learn more about magic. It's a curiosity which has gripped her for some time, especially with how mysterious the subject is. Spending some time with Twilight Sparkle helps answer some questions, but she rarely has the time to teach Sweetie about the advanced spells which captivate her.

However, she soon gets an unexpected visitor in the form of Sunset Shimmer, who's willing to tutor Sweetie in the art of magic. It sounds like the perfect recipe for understanding magic, but Sweetie can only guess what kinds of challenges await her. And while Sunset is ecstatic to teach somepony, there's much more to her visit than just tutoring Sweetie.

Thanks to Verbose Mode for the amazing cover image.

Jason's life has grown dull. While some may have thought that the weekly monster attacks might have kept him on his toes, he had grown to learn that as the norm around town. Now, after months of living in Ponyville, he can't shake the feeling that there is a void in his life. He follows his usual routine every day: breakfast, a quick shower, followed by a quick walk to the park to read the newspaper. One morning, he finds two parents playing with their filly in the playground. As he watches, an idea sparks within his mind: why not adopt a pony of his own?

Featured on Equestria Daily

Pinkie took a hop, skip and a fall straight into the underworld that exists in another dimension entirely.

Now her mane seems permanently popped, her heart keeps ejecting itself from her body, her cutie mark is missing and she's being constantly beset by strange monsters.

Pinkie fell to these monsters, now she has to dance with her heart to save them and herself.

This is an "Undertale" crossover.

Asriel was sitting at the flowers, where Chara was buried under, waiting to become that wretched flower again. Before he could become that flower again he was stabbed an unknown assailant who said that he won't die and he'll be transported someplace else that could help him. After waking up in a small clearing in a sinister looking forest he finds a way into a small town inhabited by ponies that are like humans but different. He befriends three little fillies who decided to help him the best they can. They eventually take him to the Mane 6 to see what they can do to help him get home. Asriel will learn the magic of friendship and be able to go back home. Little do they all know is that Asriel will be able to reset the entire timeline with this type of magic.

Undertale and My Little Pony crossover. Enjoy!
Info on sequel here: http://www.fimfiction.net/blog/695488/lets-talk-about-my-undertale-sequel

Sunset Shimmer almost succeeded in taking over Canterlot High, stopped the Sirens from taking over her new home, and managed to prevent the destruction of two worlds. She feels that she deserves a break and decides to return to Equestria during her summer break. Unfortunately, when she enters the portal she appears in a land that is different from the worlds she's already been to. Now she has to save this world before she can even focus on returning home.

Unfortunately, she's not the only Equestrian that's appeared in this new world, as one of Equestria's most dangerous villains is loose to do whatever he pleases. How will she cope with having to save this new world from Tirek?
(This is a different Skyrim story than my Sombra visits Skyrim story)
(Part of the Universe 13 story series, though reading the other stories is not required)

This story is a sequel to Never Wish

Daniel has been dwelling in Equestria for a while now. A lot has happened during this time and he has slowly started to grow familiar with pony customs and social structure. As new responsibilities are shouldered, it becomes clear he still has much to learn about the world he now calls home, and must now ask, how far would he chase a dream? Even if that dream was not his own?

Squeal is out An Imperfect Paradise
image edited by Nova225 on deviant art

Daniel tries his best to avoid risk, the small ones in life can't be helped but any unnecessary ones he avoids like the plague which has led him down a boring road in life. A small package is sent to rectify this problem and it does so, but in a way the sender probably never intended.

Sequel is out now, Never Dream.

Uncle lives a very fulfilling life at his antique shop. It's peaceful and quiet for the most part, just how he likes it. Of course, he's a skilled chi wizard, so he knows better than to actually let the universe know that he's content. So he complains.

A lot.

Then one day, a basket containing three infant magical ponies arrives, and his peaceful life goes out the window...to be replaced with, perhaps, something a little more than contentment.

The universe, apparently, is smarter than he gave it credit for, because now he has "Three More Things!" to complain about to hide just how much they mean to him.

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Part of the PWNY-verse.

First chapters take place approximately 10 years before the events of the first episode of the show.

Edit: Cover Art put together by Shadow Bolt
Edit 2: New Cover Art by Swan Song. Link to his page in image source.
Edit 3: Level Dasher commissioned an image of the CMC with their new Cutie Marks from Katakiuchi4U over on Deviantart. Here's the pic!