I know Rachel is not coming up again for a while, but something that really disappointed me about her RM update is that she still doesn't know that her Master and the MC are the same person. In her mind, she is actually in 2 very different (and weird) relationships at the same time. I'm hoping that they spend a lot of time and get that moment just right.
This might be beyond the scope of corruption the writers have in mind, but I hope that making one of the girls a full time house pet is also something being considered.