How I imagine Finn calling Catra and Adora "mom" instead of mama of mommy for the first time would go:
Finn: Mom, what's for lunch?
Catra: Who's mom? I'm mama, not mom.
Finn: All the kids at school say "mom". Saying "mama" is little kid stuff.
*Catra holding back tears*: Oh, ok. That's fine. I can be mom now. Is mommy still mommy?
Finn: No, I think I have to start calling her mom too. It's what all my classmates do. I don't want people to think I'm a baby.
*Later when Adora comes home*
"Hey, Cat. How was your-"
"Baby, why are you crying?"
"Finn called me mom today. They say they're too old to call us mama and mommy. I don't want them to grow up."
"Aww, Catra, I'm sure its just a phase. They'll start calling you mama again in no time I'm sure. They just want to fit in right now, you know how it is."
*Finn coming inside for dinner*
"Hey mom, how's Razz?"
*complete silence from Adora for 30 seconds*
"Never mind. I get it Catra. This sucks."












