I didn't realize they were kids of all ages and sexes. I thought they were just teenaged boys. Kids out playing will gravitate to an adult that wants to play with them. Especially if it's a cool adult.
If you didn't get any weird vibes, then don't worry about it. But it's always good to just be aware.
I didn't see it with the boy who kissed my shoulder until my husband made a comment. And my husband knew the boy, so I trust his assessment.