Not really a routine, just an idea.
Next time you hand up your workbook or whatever have a doodle on the back page of you teacher with angel wings with the caption "Pure Beauty" or something like that, make sure her name is on it too so there's no doubt it's her. Don't do anything pornographic.... unless you want to get expelled! Hahaha!
Then hand up you're work...... she might not see it the first time but chances are she eventually will.
She might react in a few ways:
You might find the page has been removed and she will never mention it.
She might ask to talk to you after class... woop!

(probs the most likely)
Or she might doodle back... but that's probably unlikely, she won't want to risk her job.
Either way she'll know you think she's beautiful and because you said it in a playful and non pornographic way she is unlikely to punish you (want to be punished?... whatever you're into! Haha!) in fact she'll probably be flattered.
If she asks you to stay back she will confront you and present you with the picture.... you gasp and act all embarrassed "I thought I ripped that out!"
She'll say something, then you interupt her with "-I ment it though....." And hold your stare.
You'll be able to gauge her interest from how she responds or reacts. If she acts negatively maybe try one more time by interrupting again with "-You're so beautiful!"
If she hesitates she's most likely actually interested just concerned about losing her job and being the next news headline..... SEX TEACHER CAUGHT IN THE ACT..... You'll have to try rationalize with her. Make her comfortable about the idea, get closer tell her it's alright, comfort her maybe go for the kiss as you are.
Read my post Vin DeCarlo "Objection Game" for under 20's and pay special attention to the part about letting her know you won't be telling anyone about anything that happens.
Anyway just an idea!
Let us know if you decide to go ahead with it and keep us posted
Cheers
Scotch-Tape