You are a human who arrives in Equestria by mysterious means

You're a dimensional traveler, able to open portals to other universes and dimensions.

You shrink around Amy Rose, so what now? You decide!

Tails create a mini ship to study his friend from the inside (PLZ ADD)

A human mage decided to go inside of our favorites ponies!

A small boy, one of many, trying to live as best he can under the giantesses of the world. (copied from writing.com)

The story is based on the story "The Frogs Who Desired a King". A man wished he had a queen to guide him so he asked the god Zeus to help him. At first Zeus was reluctant but he eventually agrees to grant him his wish

A story in the Harry Potter world involving insertion and unaware giantesses.

You are a guest at your best friend Rachel’s slumber party when you suddenly shrink. How long can you survive?

As the title suggests, a king is abducted by a massive alien, perhaps 200ft/30m tall (who the people think is either a demoness or a Goddess). Then we are introduced to the alien's friend and they do some lewd stuff. The story could be part of a larger series - we'll see.

Sammy, born into a world of tiny men and giant women, is a hopeless pervert.

You are a failed knight hailing from the Kingdom of Drakonia. With your position in the royal court toughly destroyed thanks to the clever maneuvering of the Rosewood Dynasty, you decide to embark on a quest to acquire a harem. And by harem, I do mean the type used as a political tool. That being said, nobody said you can't have fun on your journey.

You wake up in the world of Equestria Girls as a tiny person.

A "Giantess/Endo" story centered around the Princess of Friendship (PLEASE ADD)

On where all kind of portals are involved and you go nuts with it.

A hunter encounters the giant Lady of the Trees.

Another chance for me to make a decent "MLP - Endo" interactive.

【Chinese text】在上完早上第一节法术课之后，正准备收拾东西下课的你昏了过去。醒来之后，自己居然缩小了！

Tails once again wants to enter inside his friends but this time, he got company

You are shrunk in the Sugarcube Corner! Things get Crazy! (Please add if you can.)