"The Combinatorics Project" is a My Little Pony: Friendship Is Magic shipping story by Ringcaat.
In a series of five self-contained stories, we see every conceivable pairing regarding the Mane Six. Witness 15 different combinations spanning different scenarios ranging from a world where being gay in the norm, navigating through married and celebrity life, being unwittingly brought together by the Elements of Harmony, and discovering a portal leading to other dimensions.
The story can be found here.
Tropes Found In This Story Include:
- Gender Bender: In the third story, in order to be with Rainbow Dash, who is straight, Twilight Sparkle turns herself into a stallion.