Not weird imo, lots of teenagers have done this, but obviously once you have all matured after a few years you regret it / think “what was I doing”.
It doesn’t sound weird - sounds like a typical online relationship between teenagers experiment and feeling themselves with their hormones.
I’m prettt sure lots of us have done this, I have myself and regret some of the things I did as a teenager, including flirting online / sending pictures, but nothing happened with anything and it all ended ok as nothing bad happened, but I still look back at it and beat myself up about doing the things I did back then.
Not weird at all