Have I gone from friend to sexual prospect?

Okay, this guy and I became friends a couple months ago, and at the time he mostly asked me advice about how to ask out another girl that we both had class with. Not to down myself or anything, but I'm the kind of girl that gets friend-zoned by guys rather than the other way around. I'm just relatable, I guess, and not most guys' type. The other girl was my complete opposite as far as bodies go.

Lately, though, he's been saying things that are more and more sexual, like "take pictures of bath time for me," joking about meeting up for sex when we get back to campus, etc.

I know you guys say that you don't friend-zone girls, but you do. I am friend-zone girl. I thought once you were in the friend zone you stayed there. What's up with him?
Have I gone from friend to sexual prospect?
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