A fun one is a full hypnosis run. Don't let any of your Officers or maybe even non Officer girls know that you're fucking them or hypnotizing them. It's pretty hard to build up hypnosis levels that slowly though, doing 1 at a time. You can hypnotize 3 at a time in prison, but that's kind of cheating since the girls will realize you've imprisoned them at least. Once you get up to like level 5-6 hypnosis level though, man is everything a breeze.
Hypnosis ending early during the encounter will piss the girls off quite a bit too (Even if you aren't fucking them), so there's a reason to avoid it beyond roleplaying. If the encounter ends before hypnosis wears off there are no penalties. Good idea to start the hypnosis a bit late in the encounter when your levels are low for that reason. It's like try to act like a good person in front of all of the girls while you're secretly training and fucking them and such, lol.