susans relationships with students was most likely illegal, even if the students werent minors, because as their teacher, she has authority over them. if it wasnt illegal, itd likely still be enough to get her fired, because of the authority thing again. a college isnt likely to put themselves at risk for one teacher. im saying likely a lot because its a fictional world and the laws are at the devs discretion.
as far as the end result goes, im guessing you mean susan coming back and forcing mc to meet her somewhere for some reason. thing is, when she made whatever threats at that time (i think drunk driving?), none of that wouldve held up because an immediate sobriety test wouldve disproved it. if she arrested him then, he couldve claimed sexual assault (which happened) and shouldve been recorded on dash and body cams. the only thing she really has over mc and the girls is them planting evidence to get her fired, which is illegal. being able to prove it might be questionable, but the panties used were mels, not susans.
maybe im misremembering some things, but the way i see it, if they hadnt gotten her fired the way they did, susan wouldnt have any leverage to use in forcing any of them to do anything at present time.
of course, any and possibly everything ive said could be completely irrelevant to where the story is going.
and nothing wrong with wanting your cake and eating it too.