A crossover story between My Little Marriage and Project: Sunflower. The story takes place after Chapter 30 of Project: Sunflower and before Chapter 22 of My Little Marriage. Contains minimal spoilers for both stories. Co-written by Merlos the Mad and Hoopy McGee.
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Two completely different worlds, two very different women:

Mary Morris is an ordinary wife and mother who woke up as a pony one strange day. Since then, she's been struggling to retain her sanity and deal with her new body, all while hoping to find a way to change back.

Erin Olsen is part of a project to investigate the newly discovered world of Equestria. Using advanced nanotechnology, she was turned into a pony in order to better fit in with the local population.

After a test of new world-traveling technology goes wrong, these two meet up and have sandwiches.
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This story is a collaboration between Hoopy McGee and Merlos the Mad.
Pre-reading, editing and general suggestions given by Ludicrous Lycan and Firebirdbtops
Original art by Conicer and modified (text and Santa hats added) by Merlos the Mad.

It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

Hello, I'm Mary. I'm a mother of two, married to the most wonderful man I could hope for and live what I consider to be, the life I've always wanted. So... why oh why, in the wide, wide world of whys, did this happen to me?

This is my story, for better or for worse, about how things in my life became beyond unbearable.