Little!Aether, Little!Lumine, and CG!Paimon [or CG!Venti.]
I can honestly see the twins being attached at the hip, especially after being away from eachother for so long, and yet, they would be different when regressed. [Lumine would be loud and talkative, and Aether would be quiet, yet try and take on a brotherly role, despite being smaller than Lumine.]
of course!
Twins with cg! venti/paimon!
Cw: Diapers, Meltdowns
Aether is a Baby regressor! (0-3) while Lumine is 3-6!
Lumine is often the one "speaking" for Aether as he is selectively mute 99% of the time, even while big.
Lumine will often "tease" Aether and tell Paimon or Venti that "Baba/Papa!! Aether's stinky!!"
That's followed by a change for Aether and Lumine being told to "play nice with the baby, lumi, you know he can't control it"
Paimon often is the one dealing with Aether; especially with his meltdowns, helping him calm down