Ned doesn't vocalize his agreement, though his silence signifies it all the same. Some lucid part of him knows and understands that Margaery is saving him from further embarrassment, and his affection for her - the platonic variety - loves her for it all the more. She could have stormed out in outrage, or she could have lured him in knowing his feelings and transformed it into a weakness to extract that which she wants. She does neither of those things; instead, she reminds him of his love and vow to Catelyn, she compliments their parentage, she exalts his children.

He stirs at the mention of broth, though he isn't entirely sure that he contains the strength to eat. Still, he'll try - it's the least he could do after her kindness, both with his confession and with his sickness.

"I'm unsure if I will keep it down, but I should try."