[ Wow, how dare she. He's just flustered enough that he doesn't put up a fuss when she slips ahead and pays; it gives him time to get his blush back under control so he doesn't stumble over more words. ]

Well, he only showed me once, you could secretly be the master of it. And... that'd be nice, we could all three have a cup.

[ Gotta include Eren! He seems fond of the idea, though. ]