Responses

I don't agree. Maybe you saw it as that but just because a woman is nurturing doesn't mean she is mothering them or is taking on the Mantel of mother figure . To her she was always his superior that was using her nurturing nature to manipulate him into "owing" her.
And Dietrich never wanted to be any kind of father figure. He disliked ML because from the beginning he knew how ML was fall for MC. So he was took on the role of teacher/trainer so that ML would be useful tool for MC.
I'm on chapter 13 and rein seems to me more of a mother figure to will so it's so weird if they do get together . Wouldve been nice if they met at a closer age