I see...

First off, do you know about puberty and secondary sex characteristics? Author typo: 成長 should be 性徴.

Then, it's best to explain that first~

When a star falls from the night sky, it becomes a baby.

Mama told me that long ago.

HAHAHA!

To think you'd be foolish enough to ask me about such an ancient spell!!

AHAHAHA... Ahahaha...!! ahahaha...!!!

Don't force yourself.