I really hope he is not NTR ing one of the maids. Seeing that one chapter, it has me concerned. I really hope he is after Subaru's body instead meaning he swings the other way as there is evidence for that in the bath scene subaru had with him.
Well if you have spoilers, feel free to share.
I also hope he is not the true mastermind, but if he was, he could have killed them all at any time.