I fell in love with a teacher (sub)?

Hi yeah I'm 17 and she just turned 24. I've known her for a few years and we talk everyday. She isn't my teacher but a sub, so it's not just in the classroom. She has lunch duty so we just talk all period, it helps both of us. We're friends to the point where we tell each other drug stories and such and words teachers probably shouldn't be saying she says only to me in our conversations.. In graduate next year and she Isn't working there next year. What do