That cookie is the size of a small table!
Well, at least Yumeji didn't bail over the "indirect kiss" trope even though he tried to bring it up. I was getting ready for disappointment until he took that bite. Good. Also, he doesn't need to solo very unhealthy amounts of flour and sugar if Chieri bites into the cookies too, so it's technically better for him to share bites with her.
I didn't even realize until this chapter that teachers also needed a giant pen to grade Chieri's tests. I guess if it's not Sudoh-sensei, they'd probably work in pairs to do that.