Discovered an interesting quirk she actually responds better to leniency than she does to punishments. I tried doing a playthrough with only positive reinforcement things like rewards and banquets after good study sessions.  I used the basic 30-minute time-outs when she slacked off and she was widely successful. I think it's kinda funny that it's a spanking porn game and I got the naked ending without spanking her. You should totally put in an achievement called Spare the rod.