He smiled at having brought her that little bit of pleasure.
I think he under-estimates how pleasurable it is to Lois to eat food made by a man who really loves her. I also think he under-estimates how enjoyable it will be for him when she shows her appreciation at the pleasure he has given her.
He doubted she had eaten anything in the way of guilty pleasures since becoming the future Mrs. Luthor.
How is Clark so familiar with the diet of the significant others of rich men?
Clark: Lana always tried for that diet, and me I had to earn the money to make it logical she followed it.
and Lois had gazed at him with unrestrained desire,
I'm surprised this didn't lead to him finding out the curse does not apply.
he felt the need to duck out of the event early.
So it wasn't an emergency?
Clark: The suit is very tight. I had t leave quickly so people would not accuse me of being indecent.
Anyway, he had told himself, if Lex Luthor still thought Lois’s engagement ring was covered with Kryptonite, it would be a good idea for Superman not to hang around to be “exposed” to the thing.
He could just fake not feeling good.
Clark: We don't want other people to think Kryptonite works.
Maybe Clark would luck out and Luthor would think Superman left early due to the ring and not his fiancée’s heated gaze.
And maybe Luthor speaks the truth at times.
