I like this pairing, but nobody is going to talk about that infamous (amazing) indirect kiss attempt by Mahiru? When I first saw that I kind of gasped. That crossed the subtext territory into full one sided yuri crush. At least on Miharu´s part.
Wait, what's happening in the last panel? Who said Yuu-chan? Was Yuri just Yuu-chan disguised?
The idea is that Tomoko can affect Yuri's facial expression with her speech. The exaggeration of it is that Tomoko's speech can change Yuri's face, thus the punchline of Tomoko saying "Yuu-chan" to change Yuri's face into Yuu's.