I'm just happy they can grow, or be BIG, at all. I don't need context.

There’s no need for explanation. They grow big by choice or humorous coincidence...end of story. LOL

But seriously, I love your artwork and characters and whatever theme you choose. Keep up the awesome work, Chris! 😃👍🏻👍🏻

Some people just want to have fun, not think about every little detail. I can feel you, I’ve got similar problem with my OC with curse causing random butt expansions. She is mainly for fun, cartoonish scenarios, BUT there is always somebody questioning details.
- Is she an unicorn? So maybe is she a pony? If yes, why she hasn’t got any cutie mark - Aaaeh, because I don’t feel that much connected to MLP anymore and I had no idea for those butt tattoo?
- What is triggering the curse? There must be something - No, the curse works randomly, there are no rules about when and how it will happen and sometimes effect may be different.

Some people just are overthinking and we can ignore them or letting them be annoying to us.

Sometimes, you just want them big. No need for an explanation.

I was just talking to a new buddy a few days ago about my frog girl, and in one thing I've been working on here and there she does so by inhaling, in another, she just grows.
They can 'cause they can, as you say. lol

My theory: Magic

I just have fan theories that I keep to myself and just enjoy big and soft cattes

Just give them the answer to every question in the universe.

If that doesn't work, give them Medic's answer to every question in the universe.

Patrick: "Calm down. It's just a drawing."