Recently rewritten. Contains occasional adult humor and violence.
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On a request from Princess Celestia, Twilight Sparkle and the rest of the mane six explore an abandoned mansion located deep in the woods. While doing so, they unwittingly stumble across an enchanted mirror that scrambles their DNA and pops out three brand new bouncing baby ponies. Hilarity and drama ensue as the mane six must cope with being suddenly thrust into motherhood, as well as protect their new foals from a dark god that wishes to use them for his own sinister gain.

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Fanart:
The three foals. by Freefraq on Deviantart.

After an unknown accident Twilight Sparkle and Rainbow Dash awake to find themselves sharing the same body! Now they must struggle to hold themselves together as their world is turned upside down. How long can two ponies exist in a single mind? It’s a race against time as they search for answers before it’s too late. When all is said and done, you’ll never look at Twilight Dash the same way again.

Daring Do seeks a favor from her sister in Ponyville. Due to buried grudges, things quickly get out of hoof. She soon finds herself on her most perilous mission yet... with her biggest fan in the world. In the midst of truth and lies, loyalty and treachery, love and hate, one thing is clear ― some family situations are stranger than fiction.

The story extends in Through the Looking-glass and What Pinkie Found There and The Daughter Doo: Honorary Cutie Mark Crusader.

Many thanks to Honey Mead and statoose for their watchful and helpful pre-reading.

Ckat_Myla and statoose (CatNStat) have started an excellent reading of TSD.