It does get easier as you adjust. I went from Uni Art classes, to full time Industry trade job at 55 hours a week. It feels like you have no time for you. You adjust to the me time being late evening or weekends only. A 4 day (40h) work week is a better life balance. A company I worked for out here started that after COVID
With OCD it is best to acknowledge the thought and let it flow out unjudged, otherwise it takes power. What you described sounds pretty much like kid silliness. If it was an ongoing behaviour, then yeah maybe that kid liked touching peoples butts. Either way who knows right, and the “whys” don’t matter, just that you are OK now.