I like your spelling of Catharine. And especially that she's not the office tease... or worse. Little details like that help cement in my mind that this is an AU.
Definitely an interesting first meeting with Clark, Cat and Lois.
Clark stared for a moment, then turned back to Cat and asked, “She always like this?”
Cat shook her head without breaking eye contact. “Oh, no. This is one of her good days.”
A half-smile crept onto his face. “Then I’ll be careful.”
Laughed this section, and what happened just before but no spoiler here.
My favorite part though is the scene with Martha and Jonathan doing what good parents do, getting Clark to pick himself up after a real or imagined failure and keep going forward.