I think you're doing just fine @Mullet Free
I have some fairly close up experience with a handful of public school administrations and I would feel pretty good about them taking the proper chain of command steps. It's not 1998 anymore, there are protocols and mandatory reporting likely in place depending on the school district. There is massive liability involved if they sweep this under the rug and this guy then gets hired somewhere else and diddles children. At this stage you have no evidence of a crime being committed and the school district has no incentive that you know of to not handle this properly. Until your spidey sense starts going off I think your approach is completely logical. If they start going off the rails and into cover up mode all you need to do is activate surly. Hell Nicole will probably have the guy drugged and in Town Lake by 10 pm tonight.