Just this once?

I avoid straight women but like everyone on this forum I "have a friend..." Typical situation, said she is straight (I thought she was bi) but when she told me that I stopped paying attention (in the sense of ever allowing myself to become interested). Is textbook hetero looking, queer theory set aside. When she finds out I'm gay looks at me like I'm the second coming. Begins peppering me with sensitive questions, shows me pictures of women on her computer.  I said nothing. When she shows me her cleavage I still said nothing. She's fairly consistent about touching me, arms, chest, ass, leans in towards my stomach. And I just stare.  When I asked her to go to a dinner with me she quickly said "yes," even when I quickly added it was to scope out someone else. We argue a lot, usually about idiotic things. She asked me to take her to a gay bar. Sometimes she criticizes the hell out of me to other people but when I say something good about her I have the power to make her giddy. If I have a problem she'll literally drop the book she's reading and run. Once casually (in private, referred to herself as gay).

 I generally enjoy the flirtation, and the friendship. But more and more I find myself thinking about her. Even if it is a train wreck waiting to happen. I don't think she's got the guts to be open about it. And she may simply be facinated by my stoicism in the face of her immense attractiveness.

 Thoughts?