From what I read, I take that you're employed by the high school right? You should refer to your employee handbook, look for intimacy with student and if it says NO! Roll it up! Smack yourself in the head!
When she turns 18, then its all good to go dude b/c she's an adult. I knew someone that had initimacy going on with a teacher but both got away simply because they were adult although, the teacher was transferred to another school. Major disappointment for her.
My aunt when she was in high school, she had the hots for her math teacher. Long story short, they got married and now its 30 years later, they're divorced. True story.