My entry for Everfree Northwest's Iron Author 2016.

Ignores Puella Magi: Rebellion.
When working on a new type of superluminal jump drive, a rift is opened between the universe Humanity lives in and the universe of talking colored ponies. Unwittingly, the humans let their problems spread to the ponies, as the miasmatic demon energy pours through the void.
Unfortunately for the ponies, they'll only get limited support for this, as Humanity is already fighting a war with hostile aliens from their universe. The support they do get, however, comes in the form of a wish, granted by Kyubey.

Focuses primarily on the pony side of things.

Heavily inspired by To the Stars, written by Hieronym of that one non-pony fanfiction site.