Adagio became a child.
(You are Aria Blaze.)
You are Aria Blaze, one of the three members of the Dazzlings. You, like the other two members, Adagio Dazzle and Sonata Dusk, are sirens, long exiled from Equestria. Now, you look like ordinary teenagers. The three of you could no longer use siren magic and are now forced to live as normal people.
As for your bandmates, Adagio is the eldest and also the leader of the group. She is serious, cruel, and cunning. She has always treated you and Sonata poorly, constantly showing that she is better than both of you. Sonata, on the other hand, is simply sweet, carefree, and naive, despite being a siren. She always seemed so frivolous.
Now the three of you live together in a nice apartment. The three of you are a famous band, and many adore you. Even though you've lost most of your magic, you still sing well. Overall, you're doing well, but you'd still like to return to Equestria, especially considering how difficult it was to adjust to life among humans at first.
Today was a normal winter day. You and Sonata were sitting in the kitchen, drinking coffee, and Sonata was eating cookies. Adagio wasn't around. You and Sonata simply assumed she'd overslept. At one point, you and Sonata heard Adagio scream from her room. You were about to run to her, but a few seconds later, she ran into the kitchen herself.
But when Adagio ran into the kitchen, you noticed that she had changed. She had become small. Now she looked like a child, and she also looked quite cute. When Adagio ran into the kitchen, she immediately ran up to you and Sonata and spoke. Her voice sounded normal, if a little childish.
"Aria, Sonata, why has everything gotten so big? And why have you both gotten so big?"
It was clear Adagio hadn't yet realized that it wasn't you and Sonata who had gotten so big, but she was the one who had gotten so small. Sonata couldn't help but laugh and burst out laughing at how small and cute Adagio had become. Adagio immediately noticed Sonata's laughter and became angry, but even angry, she looked cute. Adagio looked at you and asked.
"Aria, why is that idiot laughing? Did I say something funny?"