Don't make my mistake. I could have closed a young, attractive teacher of mine in highschool, and I didn't. It got all the way to watching a movie at her house and I just never made a move..."movie night," lol. What a new concept that is after studying pick up.
If you want to nab your teacher, I have one simple answer for you... GAME HER!!!
Don't neglect the game, it works.
Joke around with her, continue to talk to her, and then eventually PLAN TO GO DO SOMETHING with her. Try a movie night or something, that way she won't be worried about people seeing you together in public. Start by bringing up the movies convo with her (you sound like your in C, so it's not boring at this point), then try to find out what movies she likes that are already out on DVD. Then it's as easy as judging how attracted she is to you at this point (you may have to work some before you do this) and saying "Omg, I love that movie too, we should totally do a movie night blah blah blah blah!"
The idea here is to GET IN. If she is attracted to you she will say yes. If she gives you shit about the student/teacher relationship, call her on it. Maybe treat it lightly like LMR and say something like, "Oh, you're right. We shouldn't do that, it might be TOO fun!

" Just judge the attraction and move from there. Try to game her away from other students and parents, she'll appreciate that.
Hit it man, in my honor!
Breaker