<human>: I hope this is the right place to ask this...I have a bit of a unique situation.

I'm 30 YO, and my friend is 33 YO (female also). She's showed definite interest in me (we've gone out a few times to shows, dinner, went camping last weekend and she gave me a quick kiss) so that isn't the problem. The problem is I don't know how to make a move on her.

When she is forward, I tend to be shy/introverted. I don't want her to lose interest in me or think I don't like her because she isn't very interested in "sub" girls, but I have so far been too shy and nervous to flirt openly with her.

I want to change this, but I'm not sure how to overcome my anxiety about it.

She's coming over to watch a movie tonight at my place. I tried flirting with her a little over text messages, but she wasn't very responsive. I'm not sure if that is her just wanting me to "work" harder for her attention, or if she isn't that into the idea of us fooling around during the movie.

Additionally, I'm married (to a man) and we have an open relationship. He is interested in her also, and they have plans to play video games at our place tomorrow night, while I am out with another friend. They (my husband and my friend) exchanged some messages earlier in the week and she was much more flirty with him (I'm pretty sure they may have sex, I know she is open to it), but he says it took him a while of flirting with her to get her to start responding in that way, so I'm trying not to be jealous or interpret it wrongly.

I'm looking for the best way to make a first move, or to judge her reactions/see if she really wants me to move forward. I'm typically very shy and passive, and it's hard for me to make a move. 

I know there must be plenty of advice on here about this...but

Can you provide a brief overview of the text?
<bot>: I'm interested in a girl who I am 98% sure is interested in me, but not sure how to make a move without getting intimidated/shy/chickening out.