That other girl really been giving lil sis vibe since, and I like it XD
I still can't stand the reasoning for why she placed as another wifey where she could be a maid or a normal household family friendly slave like most manga about slave and how it is good do T-T
Maybe that gramp just talking about sex slave, but does his wife not get angry or is his wife do the same thing, like that's a bit fucked up if you ask me XD Getting ntr'ed two sidedly by their very own slave and marriage getting to the point of "status only".
Well, idk that world's standard so I'm not one to talk.