Actually there will be special harem events where if you reach a certain point with both of the girls you will unlock an event/route featuring both of them. This was our aim from the start, but we first want to get the normal events out of the way to a certain point before delving in to the duo events. What I can say is there will definitely be a harem route with Lily corruption and Amber but I cannot say when it will happen.For Amber, is it possible for their to be a route which leads to Amber having sex with a girl? Whether it's her and the MC having a threesome or the MC just watching. I know that the routes between character aren't connected so it would be some random girl.