Big Macintosh X Fluttershy that Impregnated a Foal Between King Sombra.
Back story: Somehow, King Sombra is Still Alive, and Wants to marry Fluttershy to Disable Elements of Harmony.
So, King Sombra Raped Fluttershy and Fluttershy impregnated a Foal Between King Sombra.
(Fluttershy Does NOT Want foal Between king Sombra. She wants Foal Between Big Macintosh.
Big Macintosh and Fluttershy Love Each other, And Both Wanted to Marry Each other.
I mean, Big Macintosh is Wanted to Marry Fluttershy, and Fluttershy is Wanted to Marry Big Macintosh.)
P.S: Also, King Sombra Stole Fluttershy’s First time. (She’s Virgin.)
Yes, I know It’s a Stupid Idea.