Another egg split. "It's a boy!"

It looks like we're going for biologically correct Nemo here...

Nemo glanced aside. "Actually, he'd, um, she'd, um. Have been my mate."

Yep. We are.

I love how you were able to blend the truth about nature with the cartoonishness of the movie in question. You nailed Dory's character, but it works best in Nemo's shame that he didn't mate with his Dad.