Post high schoolers

It was 3 people on the young-ish side but not much younger than me. Probably post high school but not quite in college. They looked as though they were planning something. Snickering while they plotted. The tree I was hiding behind was also massive and able to shield myself from them and from Ms. A’s view. I looked at Ms. A for a moment as she was still bathing herself in the water and turned back to find the group was coming closer to me. “Did they see me?!” I asked myself. Suddenly they stopped at the tree right beside me and I finally saw what they were looking for. Ms. A’s clothes!