What a truckload of Kei character development suddenly. Excellent. It's easy to imagine Asuka's feelings for Kei were affected positively by how she saw him go through the loss of his beloved mother.
On a more comedic note, I'd say Yuuki looking at Kei for ideas for moderate calorie dishes might be in vain. Kei himself is a guy of not too shabby a constitution, he has two younger siblings in their intense growth period, and even the leecher invading their dinner table is an athlete requiring more calories than some couch potato.