I also likec the nubile young cadets of the academy Jessica and Phoebe despite the very little content they had. I would recommend adding a route were you infiltrate the academy (maybe placed as a headmaster spy from syndicate or tenebara?) from the beginning and slowly corrupt/coerce them to be your willing lovers? that would be hot.
I really think interacting and corrupting/coercing the young cadets from the beginning is one of the few missing tropes this game should have!
Generally, I really liked the long game coercion/corruption/romance routes more than the quick mind slave/drone routes for two main reasons : First the tension and build up to the climax is amazing, which is the exact reason why I liked this final update so much regarding the alien queen and her daughter. Secondly the girls don't lose their personalities and become mindless drones, like most of the routes in the game.