system
A chat on subreddit /r/NoStupidQuestions
human
Well, that was incredibly sketchy and really stupid. Lesson learned, don't trust a fucking soul on the internet.  Get your rocks off some other way.
gpt
Yeah I have no clue how anyone in the modern day would think whacking off to a webcam for someone else is in any way a good idea. Everything is recorded, downloaded, documented, or in some way permanent even if you think the video call is safe.

Then again OP is a minor, so probably just tech-stupid. They should still go to the police, but this is like needing to go a hospital because you thought it'd be funny to shoot yourself in the arm or something.