How about the fate of the Real FLurry Heart?

Cadence not liking her new fate too much and taking ineffective action against her husband and imposter?

Maybe Cadence managing to find a way to fix her situation, rescuing the real Flurry Heart, and giving Chrysalis her a taste of her own medicine.

Shining Armor and Chryssi/Cadence diaperplay, much to the latter's surprise and alarm.

Going with a similar thing you drew with Filly Anon, Cadence trying to spell out a message for Shining with blocks.

Chrysalis comes back from a visit with the other princesses, of course posing as Cadance, and to the real Cadance's surprise, bring multiple diapers that're actually the other princesses and the rest of the mane 6, including Starlight Glimmer. All hope is lost, but Cadance isn't worried! How can she be? Chrysalis' spell had a side effect for the long term; regressing Cadance's mind. With the mind of a 1 year-old foal, she lacks the cognitive functions to worry about such things as the state of the world as it's taken over. All she cares about at the moment, is her very messy diaper, and how warm and mushy it feels! She can't keep her hooves of off the reeking, ruined treasure wrapped securely to her flank!

Chrysallis turning shining armor into a diaper for future changes.

shining safes his daughter and know that Cadance is really Chrysalis, he mental regress her by tricking that to night was their special that he babies candance.

Things get reversed and Chrysalis ends up being the foal for Shining and Cadence...and she eventually realizes that it's not so bad and she can get lots of love from it.

Chrysalis pulling Cadance out of Shining's hooves, claiming that she's cranky when she starts crying and forcibly breastfeeding her.

I'd love to see Chrysalis giving Cadence a much needed diaper change

Flurry heart at the Hive and getting along very well with the changelings

I'm with you.

"Why are you all so bloated and lying around?!" "Too...much...love...so...full..."

Flurry Heart as queen of the hive

A mirror page, one side Cadence/Flurry enduring her baby life, the other side real Flurry Heart having a fun vacation with the Changelings.

Cadances struggle put into thought, perhaps enduring a lack of control as a foal and slowly accepting being a baby?

Flurry Heart returns having taking control of the entire hive and Chrysalis gets blasted and she becomes a nymph again and starts her life over.

I'm thinking slow mental deterioration for Cadance until she is Chryssy's happy little foal.

Maybe the two getting into their roles? Cadence into a burbling baby, and Chrysalis enjoying her motherly role.

Suppose I had a three ideas:

Chrysalis looming over Cadence, gently pressing her hoof into her diaper or patting her on the head, gloating with a motherly look, her eyes that changeling green "You know what's great about an alicorn foal? Do you Cadence, I mean flurry..." Cadence whines "No one knows how they age, how long they stay foals...so I'd say you're in for a lot of diaper changes..." In a mirror nearby we can see the reflections of Cadence and Chrysalis in their actual colors.

Another would be Cadence on the floor, whining with her eyes in a green shade, Chrysalis leaning behind her, her own eyes glowing as she takes over her mind, sneering over the princess and placing her hoof on her diaper, pressing gently "can you say mama?" is all she says.

One other idea would be Cadence looking from her crib, Chrysalis leading Shining into the nursery, looking motherly and just a bit smug as Shining is in a diaper too, his eyes green with his mind taking over. "I've made some changes...well I'll be making plenty more, don't mind sharing your Changing table with Shining"

cadence as flurry heart finds they actually dont mind using their diapers and actually like it, it turns out. like, REALLY like.

showing the babyish torture that cadince is going threw

Baby bouncer. High chair feeding. day care the works

Cadence Chrissaliss changing Flurry Candence messy diaper, which actually felt it was not that bad.

Chrysalis exerting her mind control over Cadance and making her accept her new role as a foal and Chryssy as her mommy so she can feed off of that delicious unconditional love.

Flurry Heart becomes to new Queen of the changelings somehow. And the changelings themselves, find out Hugs from Flurry heart are quite nice. This is of course all AFTER her temper tantrum caused by her realizing her Whammy is not there with her (which we know got left behind)

Remake the comic except replace everyone with table lamps.

Transformation of Shining into a diaper for Cadence to use would be pretty amazing. Would Also almost a complete reverse of what you did in the Nightmare Rarity comic, so that's fun.

Hello! I came here to congratulate you! YOUR COMIC IS ON Equestria Daily! WHAT AN ACCOMPLISHMENT SKITTER!!!

You know what would be very, very evil? If Chrysalis curses that pacifier, so that it's addictive in how happy it make Cadance feel. But the more she uses it, the more she feels her mind slipping away. She'll finally succeed in spitting it out as she teeters on the edge of losing her mind...only to have Shining Armor pop it back into her mouth.

Afraid I'm not much for the whole 'diaper' thing, so I'd like to suggest it not go there. Course if it's bonus pages, I could just ignore it.

Personally I think it'd be fun if Shining realized what's going on and used some spell/magic thing to swap Cadance and Chrysalis's bodies. Cadance is now the changling queen, able to still look like 'herself' and since they already have a Flurry Heart, Chryssy becomes Skyla.

Candace as Flurryheart struggling in disguised Chrysalis's grasp to point out something to Shining Armor that could piece together the puzzle (like she bit her and she's bleeding green), only to lose control of her bodily functions because she's now a baby and Chrysalis covers it up by saying something along the lines of "poor things' constipated", to then change her diaper in private, talking about how humiliating it must be while hinting at her plans.

Shining Armor redeeming himself and getting revenge for being made into such a complete idiot (and most likely being tricked into cheating on his wife, making him even worse) and Cadence also getting revenge.