We were the same age, started just by us hanging out at home all the time.
Lasted a little over a year until I got booted from high school and moved back east with my father.
No idea if my mom/her dad knew or suspected. They were both pretty solid drunks.
My friends knew, I was a scumbag skeevy stoner, so if course I told anyone that would listen.
I eventually caught feels. Pretty sure she didn't. For a long time I was super into her friend who, I'm pretty sure, thought I was a loser. I mean, she was not wrong.
Mostly I think the whole deal was two kids exploring their own sexualities with the most convenient person in proximity.
I feel it is also important to add that the whole thing was not attractive in any way. Like when I read shit like this I always imagine hot people doing hot shit. Defo not the case, lol.