A short snippet from the accompanying story, since I've had some people ask me about it.
Watch me to be first in line when it's released!
(Do note that this is before-edits. Expect considerably less pronoun abuse and overall better writing when the completed version is released)

“Baby food?” Luna asked incredulously, although it wasn’t really phrased as a question. “Celly, I’ve humoured you and your prods at my current size, but that doesn’t mean-” Luna was cut off when a something slipped into her mouth as she opened it. Instinctually, she clamped down on the invading object, only to taste a metallic tang and feel a mash fill her mouth. What was revealed to be a silver spoon came back out and, now free of the food that had been on it, floated in front of Celestia.
“Celthy!” she mumbled past the gruel, “I sthear…” She stopped suddenly, her jaw moving up and down for a second before her throat bobbed. “…I do not remember peas tasting that good…” she said finally, face awash with conflicted feelings.

“I told you, your physical shape, as well as any attributes it may have had, are now the same as they were back when you were a foal. You were too young to remember, but peas use to be your favourite food, so I figured that the same would be true now, too,” Celestia explained. The spoon dipped into the jar again, drawing a heaping mound of green goop with it.

Luna stuck out her tongue in disgust. “Ugh, it may taste fine, but it still looks disguthmpph-!” She glared as her sister once again got the mash in-between breaths. Swallowing, she began, “Would you stop that? Just give it here and I’ll feed mythelphh-” Another spoonful snuck past her gums. “I said stop thamph!

Celestia giggled. “You’ll have plenty of time to complain later, little sister. For now, just open your mouth.”

“No.” The filly turned her head away and shielded her face with a hoof before Celestia could get the vegetables in again. “I am quite capable of feeding myself, Celly. Yes, I admit that, as I am now, I might need a little help with certain tasks, but I have two perfectly good hooves and I’m still more than able to use them. Now, if you would be so kind as to-“

Something wet and cold began sliding down the moon goddess’ face.

“Oh dear, I tried to feed the wittle baby more of her yummy food, but her mouthy-wouthy was in the wrong place!” Celestia cooed to an irate Luna, who now had some of the gruel smeared across her cheek. “I guess I’ll just have to try again…”

Luna shot daggers at her sister, or at least as best she could out of her peripheral vision. “Don’t you dare, Celestia! Get me a moist cloth so I may wipe this away before it stains my coat!” The spoon began to edge closer. “Quit that, no closer!” Luna hissed through her teeth as it hovered towards her slowly, unerringly. “I demand that you desist! Halt! Cease!” The dark filly slowly grew more fidgety as the food drew ever closer, her eyes wide and panicked, never losing contact with the silver vessel. “Please, Celly, stop!” Luna pleaded as she leaned back to buy a few more precious seconds of relative cleanliness.

Squick

Luna let out a long, forlorn sigh as a dollop of the mashed peas slimed down her face.

“Looks like I missed again!” the Celestia exclaimed, her voice a little too enthusiastic for Luna’s taste.

Thinking the worst was over Luna allowed herself to deflate, only to feel something cold start to massage the side of her face. “You had better not be doing what I think you’re doing, Celestia…”

The elder sister gave a devilish smile. “How could I know what you’re thinking about?” she reasoned. “I’m just simply spreading it out a little, since you seem to want it on your face instead of in your belly.”

Crossing her forehooves, Luna admitted defeat. “Fine, I’ll let you feed me the blasted peas, but you have to wash my coat first! Green does not go particularly well with blue.”

Chuckling lightly, Celestia brought over a wet towel. You were planning this all along, weren’t you? the dark alicorn thought when she noticed it was already warmed up. “I beg to differ, Lulu. I believe sage accents your azure quite nicely, actually.”

“I’m sure you and your rainbow mane know all about complimentary colours, but I quite prefer my coat without the addition of peas ground into it, thank-you-very-much,” Luna quipped snidely.

The cloth scrubbed a few more times before floating back to the sink. “There, all done!” Luna’s sister announced. “Now, open wide. The mail mare has a special delivery, an express package to tummy town!”

The filly gave a half-lidded stare. “…No.”

The mare badly feigned a hurt expression. “Aww, you don’t like it? I thought it was pretty cute.”

“’Cute’ is for puppies or a foal’s drawing of their parents. That was… unsettling…”

The elder sister looked thoughtful for a moment. “Hmm, yes, I suppose I got a little carried away with that…” For what you’ve done to me so far, I’d hate to see what happens when you really lose it, Luna mused.

Oh, wait, I know; you’d send me to the moon. Still, I can’t quite decide which would be worse... Her brow knotted at that.

“Here comes the choo-choo train!” the Celestia said before noticing her sister's expression. “Hmm, not that one either? Well, just open up then, if you want to be so dull about it.”

The filly begrudgingly obliged.

Celestia planned this from the beginning, didn't she?

Let's hope that when Luna returns to adult size, she turns Celestia into a foal as payback!

Why wait until she's an adult?

Indeed.

Celestia is a master of planning.
That said, Luna is no slouch in the realm of ruining well-laid plans >: D
You'll just have to wait and see what she manages to cook up...

Also, that high-chair is amazingly high. More like a stilts-chair.
But great picture overall ^_^

True, but then again, this is Celestia we're talking about. She's known for being incredibly tall for a pony; not even Big Mac can match her height.

Well, she can sit down, I guess?
I'm just imagining how high the centre of gravity is on that. It looks like a strong gust of wind would send it tumbling over :o

It's magically kept balanced.

Touche.
Blasted magic, it cheats.

The Higgs Boson would like to have a "Private word" with your magic, good sir.

Who?

A particle that is used to make Quantum Mechanics and Theory possible. It's often called "The God Particle" since it supposedly was required to create the universe. It recently made news since scientists believe they've finally proved its existence after being just a thoery for more than half a century.

Oh yeah, I think I heard about that somewhere.

ewww baby food >.> I'd be making that look too....

In any case, your's is next.

hehe yay ^^

um... would it be possible for me to watch it getting made? :3

???

I believe he means watching a livestream of you drawing it.

I meant what :thebackup: said ^^;

Oh. Sorry, I don't have a livestream, nor do I have a recording device.

ah well https://join.me/ is a free and easy way to stream (if you ever decide to do them for anything) , its what I use for allowing people to watch me make my games ^^

Thanks, I'll keep that in mind.

no prob, also if ya ever wanna see my streams lemme know, I kinda only post em in my skype and yahoo, since I like to know who's all going to show up

Refusing to be fed peas in a high chair next to a dinner table by a parent figure seems to be a very common theme.

You've noticed, too?

I've even asked if it was a meme, because two of my watches submitted a pic with their character refusing to be fed peas on the same day.

Hmm...strange.

I'd say it's a veritable trope. You can see the theme being used in the oldest of cartoons. :P

I am utterly convinced that that is mushed Alfalfa.

Cute picture. I love their expressions. I feel like Luna's position in the high chair is a little awkward, but all in all great job!

Oh and I have to say, Celestia's hair looks FABULOUS~

Thanks.

I was thinking the exact same thing! Soon as I saw the image (but before I saw the title), I thought "Alfalfa!"

Did you see he redid that comic? I cried the first time he drew it and I cried this time too. Manly tears. Yes. /mentally advanced pinkie pie

Oh, she'll get her revenge. Just wait...