Mr. Verres tells Tedd that Grace cannot get pregnant in her squirrel form. Tedd smiles involuntarily and continues smiling despite his father's admonishment.
Hold it son. I must inform you that I am to be away on business for a few days.
Tedd
Really?
Mr. Verres
Yes, and while I'm gone I want there to be no fooling around between you and Shade Tail!
Tedd
What?! Are you talking about--Dad, we've never had--
Mr. Verres
Nor should you! Fool around with her in human form and she could get pregnant! That and you're too young anyway for such--
Tedd
Wait, back up. Why specify her "human form"?
Mr. Verres
Oh, well the scientists who made her worried about that would result if she got pregnant while half- squirrel so they designed her so she couldn't get pregnant when transformed.