I wouldn't say that any of the four are scum at this point YET. The upstairs sister is still showing resistance to the idea of being superior and is hesitant about poo pooing onto the downstairs sisters.
If you don't, you'll be punishedYou must do poo poo and pee pee in that placeThose three are not easy at all are they ?U... understand easy...But!big sis!Screaming and struggling...Take a look down thereReimu, you are a very easy yukkuriLet's leave it at that. More importantly, ReimuThat's why the easy you shouldn't bother with those trash