I really liked this. When there isn't necessarily a reason for it. You just spend a lot of time together, pay a lot of attention to each other and, for some reason, the little details, little mannerisms, they just stick with you. Until you find yourself unable to look away anymore.
Senpai may not have given an answer back, but they've already established how strange and differently she behaved. She may not have said anything back out loud, but I don't think she needs to. There is love and careful consideration in her words and her gestures towards her, and I think that's enough. Enough that she told her to keep coming back. The same way Aoba could've not expressed her feelings out loud, but how she felt by then was still written all over her face