To have a foal, newlyweds Applejack and Rainbow Dash seek a suitable surrogate stud. With Rainbow Dash still in the Wonderbolts, it comes down to Applejack to be the mother. So they enlist the help of Rainbow's father, her closest male relative, to do the honors.

Guess what happens next?

Spoiler: Incest happens.

Written for the Wincest Double Trouble contest.