So since I recently re-read it, back in Chapter 79 Hahari with her hair down looks waaaay younger.
The entire point of the end of Chapter 134 was that Rentarou did not in fact zing with Shizuka's mom, meaning he had to actually argue with her instead of well...Hahari happening.
holy shit i forgot about that chapter its been so long. given that info maybe its a mei situation where while they may have “looked” into eachothers eyes maybe she didnt? i know im wrong just let me cope