Am I flirting?

If you urgently need to know whether something is flirting, you're welcome to decamp to http://amiflirting.com/submit or send correspondence to amiflirting (at) tumblr.com. Will we assume you're flirting with us? Only if you want us to.

11. If I Ask Him About the Book He’s Reading On the Train?

Unless he’s grading you for credit, usually, yes [1]. And only do this if you’ve read the book. You’ll sound silly if he brings it up in bed later.

[1] And even if he is your TA, that doesn’t mean you also aren’t flirting.