Male characters in Yuri can sometimes be good friends and/or provide interesting narrative elements, but I dislike the inclusion of the guy here. Him discovering them at the end, a lot of the dialogue being about jealousy because one of the girls keeps looking at him, he feels weirdly central to the story for no good reason. Plus they knew he was outside, and it was so weirdly obvious to me that he'd discover them. If the girls were focused on each other and there was no guy here it would be a lot better in my opinion, anyways thanks for the translation!
Personally, I didn't feel it that way. I mean, the guy was just a pretext to lead to them getting off at school. We don't know if she was actually looking at him or, like she said, just spacing out.
But I share the fact that he not being there wouldn't change anything.
In another hands, I found it peculiar that Shino was so sure of herself about them not being found in the gym storage, like she already did something there before with someone else. And with Michiru's insecurities about Shino liking more dudes than her, I think Shino had already dated before, mostly or only men, and she fucked one of them in the gym storage before dating Michiru without being caught. And maybe, Michiru has never dated before, that's why she is so insecure.