"Please, I know you better than that, Della. You trying to start some chaos of you're own there?" You think threatening to give Inigo more affection will work on him!?

"But okay." Here he is, backing off. Arms folding across his chest. "No scheming," he lilts. The voice of innocence. "I'll just be the better son without trying!"

See - he's not even trying to hide what he's doing. Which is nothing, obviously!