I don't fully understand Rina "protecting" Mayu when the other members of the club accept her and seem to be under the assumption Mayu is the same and aren't causing her any problems as a result. Unless Rina herself has doubts about Mayu's feelings, but that seems odd considering Mayu wanted to date her openly. This one kinda feels like Rina is overly cautious or making up a problem as an excuse. The art and translation are great though, as usual, but I just wasn't feeling this one.
Because people outside of the club exist. I’m not saying she’s making the right choice or anything, but a few people knowing is different than everyone knowing.