Rei is into older oniisan type of guy huh
That matches the setting Yumeno was thinking for her love interest in special chapter but scrapped because Rei is too young.
Well someone got jealous! But wow, they were together for only one week, it felt it was a little longer.
And yes, Yuki wasn't obssessed :( I mean, they were together for so long, he loved him so much, it is hard for him to move on.
I went to check this author twitter, and they clearly are focusing on the cheaters. They are probably the endgmae the author wants. That's why they always portray Nanase badly. I can't with Yuni and Fuuko, specially when Nanase confronted them and they keep fondling each other right at her face...