This girl currently has a boyfriend. She has been texting me like crazy. I have set up some meets with her but they weren't nothing long just simple bantering for a little then she leaves. I think she wants to escalate things further with me but shes still dating her bf. I don't try to push things to far but just make it clear that I would be sexual with her. She accepts compliments well and when I talk to her she is nonstop smiling and looking into my eyes. I figured if I had a good solid place for us to be alone at that I could seal the deal but I can not think of an appropriate place to invite her to without it looking like a "sex" meet up. I have been with this girl in the past and have had sex with her,we've been friends ever since. Need some advice........

Dude,you've already been there. You shouldn't have any problems going there again. Invite her where you first had sex. She'll get the message. There's no reason to run around this one , you've been there , so she either wants to go there again or doesn't.

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Alright I understand that...but how should I escalate things? Should I just be direct or should I keep it all indirect?

Go direct, i actually read some good stuff about this, i belive it was 60yoc that said to a girl:

I can't be fucking friends with you anymore, when i look at you i just want to fuck you all night long.

Do that and either you will fuck her like never before or you'll lose her cuz she's not interested in you, but judging on everything u said this will not happen

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Heat

This is funny stuff!
I actually said something similiar to my GF early on in our relationship when it looked like she was LBJF'ing me...

I said: "I don't want to be your friend, damn, just look at my facebook, I've got more girls than I can remember who want to be my friend...I want you for way more than that..."

It worked!

Currently, I'm dealing with going AFC on her but that is an entirely different subject.

I'd do what was advised, take her to where you were you had sex with her before, or take her to an obvious place to have sex...

Why you haven't kissed her yet I don't know? Usually that "first" kiss (even though you've "kissed" her before) will lock her mind on having sex with you. Just make it as perfect as you can...