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

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

Angering a powerful witch, an adventurer ends up shrunk to lilliputian size! Where would they go from here?

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

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.

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.

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.

A size story featuring the characters from Granblue Fantasy.

A devious deal with spooky spirits diminishes Blake's size.