Wasn't saying I agree with it, simply that I think that's why people think Lucy will be the one to train her.
I can't see Lucy "training" anyone she doesn't worthy of being with MC. She sees the relationship, the bdsm included, as healthy and loving, which it is, so I can't see her inducting Rachel into it.
Vikki I can certainly see enjoying tearing Rachel down.
Personally, I don't want Rachel anywhere near the harem and BDSM until she's had a redemption arc of sorts, has seen the light, and will be entering in a healthy way. The turning the First Families girl into a whore, a private whore but a whore none the less, is already borderline if not just outright abusive to me.