Instructor-Student

So I'm new on this thing and I'm pretty good at meeting girls, but somehow, I always end up in weird crushes.

I started to teach latin ballroom dance today and the age group was 16 - 20, I'm 23. I teach well and some of the girls already know me from previous classes. There's these 2 that stood out and makes me want to pursue them, but is it awkward to do that??

One HB9 aged 17, keeps laughing at my jokes, but doesn't say a word to me, unless i tell her to do something or question something.

The other is a HB10 aged 18 and during a break, she's teasing me and asked who I was texting and threaten to take my phone away! She also said.. "life isn't all about you" *sarcastically when she came back to look for her friend, when i attended to her coming back into the studio....

I didn't leave my e-mail or number, but i do teach them for 5 more weekends, should I even bother with this?

i say you go straight for the 17 year old

I say go for the 18 year old, get her while she's legal man.

so update on the situation, the 18 year old now has a boyfriend. The 17 year old is still single. I don't have her number or e-mail, but we started private messaging on facebook... and she's always stretching out words (ex, hellooooooooo sexyyyyyyyyyyyy, how are youuu?) but like she stretches out my name and has lots of smiley faces on her messages.

I jst neg her out a lot and she's always touching me (arm, shoulder and pretends like she's gonna hit me), smiling at me, trying to get my attention during class time... pretty sure she is into me and all, but how do I ask her out? the last class is this coming Saturday, then I won't see her unless I make a move. What can I do to make it sound casual yet convey the fact it's a date I'm after?

any thoughts about my question or general thoughts?

Don't even bother, she is not 18 yet !!