So a while ago I mentioned that I have a whole AU made because I started to spite ship Meteroa and Festivia. Because I decided how the writers and the fandom treat the two was not it when the baby switch was revealed.
Warning this is long and I'm on mobile.
So to start in my AU the switch still happened, but I actually have a reason why they chose Festivia.
Festivia is Meteora's soul mate. The Magical Commission used the wand to find Meteora's soul mate because they believed that person would be the best fit to rule Mewni since that person would technically be married to the throne anyway, and with them sending Meteora away to Saint Olga there was no way it would backfire.
Spoiler alert, it backfired.
During Festivia's traveling years, which totally happened because there was whispers and attempted coup from both Monsters and Mewmans, she accidentally met Meteora.
Both were sneaking away from their respective gaurdians and then hid in the same spot. Festivia was fascinated by Meteora, especially her tail, and declared themsleves new best friends. Meteora, the shy thing, went along with it. They were friends for years and then they just fell in love, and then got married.
During the years of their friendship Festivia was the one to insipre Meteora to open a finishing school for girls. She wanted more princesses to become like her friend.
Festivia (who is scarily good at politics when she wants something done) began to work hard to regain trust in the people so that she could begin work on a Mewni that was better for her friend/wife. Once she got the Mewmans to love her, she started to look at potential peace agreements.
When Festivia fell pregnant with Dirhhennia no one knew who her partner was, and then one day Meteora showed up trailing behind Festivia. Festivia declared Meteora her wife and Mewni's Royal Consort, what were they gonna do? Festivia was already pregnant. Festivia knew it was a huge gamble but to work towards a better future for Mewni and to try to win a political move towards peace with monsters she did let it be known that her wife was 1/2 and her child would be 1/4.
The family loved one another and were happy for a few years. That changed around the time Festivia fell pregnant with Crescenta.
Around that time is when the two women learned the big secret. Meteora was Eclipsa's daughter and Festivia was sold to the Magical High Commission.
Meteora's temper flared and she stormed out of the castel. Festivia smiled at their daughter and said "Mommy just needs to go do some important things at her school right now. Come play a pretty song for Mama."
Over the next few months Meteora came on short visits and refused for her family to visit her at St. Olga's.
Things grew tense in kingdom too. Less monsters agreed to peace talks, and Festivia found herself starting to house Mewmans from all over the kingdom. Throwing party after party to help the Mewman's distracted.
One day it just exploded.
Festivia had enough and marched over to St Olga's. Where she found her wife experminting on her students. Some nothing more than floating corpses.
Angry Festivia demanded why Meteora would do this. Meteora answered that it would keep them and their daughters young, young and strong enough to one day fight the Magical Commission for what they done to them. For what all of Mewni has done to them.
Festivia looked on in disbelief. "Mom wouldn't want this."
Meteora scowled. "The Commission raised you to be their puppet. She wasn't even your mother. "
"And you aren't the woman I fell in love with."
Meteora turned but Festivia was gone.
More and more Mewmans ran to the castle for protection, and Festivia housed them all.
Stories of floating corpses with black eyes and monster attacks became frequent. It came to the point where Festivia sent Mina and the other Solarian soliders.
Then came the day Meteora and her army made it to the gates. Festivia met them there with her wand in hand and butterfly wings on her back.
"I want the queen and princess alive!" Meteora comanded.
Festivia gathered all her magic. "Memory eraser, pew pew."
Her wife defeated, no longer remembered, and with a broken heart Festivia went into labor. Crescenta was born with silver hair, Festivia changed it to blonde with a simple spell.
Meteora was returned to St Olga's as the head mistress. Festivia prayed her wife remained good hearted like she was before. The kingdom now belives Festivia's spouce is Prince Musty Moutian and that one of her daughters is the product of an affair. Festivia smiles on, no one guesses to the secrets she keeps. She altered the history in people's minds, in the texts, and she tried to plan for a better future when one of her daughter's take the throne. It is Festivia's hope for change.
Festivia takes all her secrets to the grave along with all her love for her wife and daughters.