Still working on the next installment... but recently, I was hit with a bout of inspiration for a whole series of stories to fill in the ten-year gap. Consequently, I've developed the following list:

~*~Existing stories: ~*~

"Sweetie Belle's Gift"; by Dokariss
- Sweetie Belle volunteers to be harvested by her sister.

"Applebloom Lends A Hand, and Other Limbs"; by Anonymous
- Apple Bloom volunteers to be harvested by her family.

"The Vivisection of Starlight Glimmer"; by The Bizarre One
- Twilight and her new apprentice Liza Doolots harvest condemned criminal Starlight Glimmer.

"The Brain Transfer"; by The Bizarre One
- Ten years after Starlight was harvested, Twilight and her apprentice/part-time lover Liza transfer Derpy Hooves' brain from her old, injured body into a new one. Afterward, Twilight takes Derpy as her lover.

"Twilight's Dinner Party, part 1: Cannibals in the Kitchen"; by The Bizarre One
- Six months after Derpy's brain transplant, she, Twilight, Twilight's apprentice/lover/recently adopted daughter Liza and Derpy's daughters (Dinky Hooves and Amethyst Star) are turning seven mindless clones into food for a big dinner party.

~*~Forthcoming - direct sequel: ~*~

"Twilight's Dinner Party, part 2: Feasting on Clones"; by The Bizarre One
- Twilight, her housemates and their guests (the two senior princesses; her parents; Shining Armor, Cadance, their two daughters and Spike; five couples and their children; and one undecided guest) enjoy their dinner. (I've upped it from 28 people present to 30 total.)

~*~Forthcoming - midquels, set during the ten-year timeskip: ~*~

"Scootaloo's Sacrifice"
- A few weeks after Starlight's harvesting, Scootaloo asks to be harvested as well, gifting her parts to Rainbow Dash. (Items made from her include a hawk-billed cap with her wings mounted on it.)

"Diamond in the Lab"
- Diamond Tiara and Silver Spoon's parents sell them to Twilight for harvesting, and the two find unexpected friendships after being reduced to disembodied brains.

"The Silence of the Sirens"
- The three Sirens have been caught and sentenced to harvesting, and it's up to Twilight and Liza to do so.
- After Adagio and Aria are harvested, Sonata Dusk is ultimately pardoned and becomes Twilight's lover for a time, but later moves back to the other world to live with Sunset Shimmer, her eventual wife.

"Crusaders United"
- Babs Seed learns what's happened to her favorite cousin and her friends, and volunteers to join them in Twilight's Brain Room.

"Sugar In Your Castle"
- Twilight's surprised when an Earth Pony girl named Sugarcoat asks to be harvested, having chosen to give up her body so she can contemplate the universe in peace.

"Gift of the Moondancer"
- Twilight's been dating her old friend Moondancer for a while, but the other girl finally realizes their relationship won't last, and asks Twilight and a visiting Spike to harvest her.

"The Wedding Feast"
- Trixie Lulamoon and Pinkie Pie are getting married, and Twilight's been asked to cook a mindless clone of Trixie for the reception.

"Happy Birthday, Liza"
- It's Liza's eighteenth birthday, but she's the one with a present to give Twilight. (Very little guro planned.)

"Liza's Little Life-Changer"
- Liza develops the technique that triggers her ascension into an alicorn: orgasming while linked to one of the disembodied brains in Twilight's Brain Room.

~*~
Anyone who wants to write these nine midquels (or any others you can think of - just run them by me first, so they don't conflict with anything I've written or have plans for) is welcome to do so.