Hey hey hey: interacting with minors, as an adult, is fine--but be mindful that you are in a position of power. You are not peers. Express those boundaries clearly. Be a positive influence in their life, don't predate them under the guise of peership.
Kids, side-eye any adult who tries to blend in with your peer group. Don't hand your trust to someone who compliments your maturity or downplays their own in effort to relate to you. Stay safe. Never EVER trust an adult that tries to interact with you in a sexual manner.
It doesnt matter if you made a funny sexual joke first and the adult is just "playing off" of that to be friendly, funny, and relatable. Adults know better. We know what that means, we know what it invites. We know what we're doing. Don't trust an adult willing to cross that line