Batatamorr
Regarding the sleep route (I think it's possible to implement the same concept in other routes, but I'm not sure), I have a suggestion. Why don't you make "Did you let Maggie be seen by a young man while sunbathing" the choice whether you consent to sharing your women with other men, and "Did you block Mark from Maggie's mind" the choice whether your women consent to fucking with other men.
The idea is that if Choice 1 is true and Choice 2 is false - take the sleep route for example - then Maggie and other women will never think of cheating and will do her best to stay faithful to you, BUT you will betray that trust by robbing her of her consciousness and practically whoring her out to other men for your amusement and/or profit. For example, let's say there's this man that she intensely dislikes for X reasons, so you snap away her consciousness and let the man she dislikes have her way with her. When she awakes, she'll never know what happen and continues with her life like nothing's happen, but both you and the guys who fucked her know it's anything but.
IDK about other people, but this is one kind of evil porn that absolutely gets my blood pumping. Also offers a kind of variety that's rarely seen in Western porn (cuz I know that on the flip side it's one of, if not the most popular type of porn in Asian eroticas).
One Western example I could find is the Perversions and Transgressions series on Literotica.
For the exhibition route, the women are reluctant to strip in front of anyone but you, but circumstances force their hands. For the domination route, they want to be your private slave but you push them out mercilessly to be public toilets. This PROBABLY doesn't suit the neutral route since it seems like the true love/end route, but then again, perhaps it's precisely because it's the true love route that it makes the betrayal even more intoxicating...