Photographers are quick to notice lewdness... I think she wasn't bothered, more like "oooooooooh...so that's how it is" so is not just academic progress
I lol'd with Airi
Airi: You look so good studying, I want to take photos!
Michiru: Oh thank you! go ahead
Airi: Ok then take off your clothes
Michiru: oh...
Kanae, thinking: Oh, Haruka's touching my thigh again. Luckily I know from observing Miyoshi and Ayano this kind of thing is perfectly normal between friends and doesn't indicate romantic or sexual tension at all.
@Sindai
Haha yeah Haruka is putting her hand on Kanae's thigh, I'm surprised she didn't find it unpleasant or suprised, which is good. lol. Now Haruka just need to test how far Kanae's willing with the closeness.