Thank you for taking the time to read my post I know it's long, but bare with me for I have a lot riding on this.

Let me give you a quick briefing on the situation: I have spent the last month working on a summer internship program with a lovely HB8. During the first half of the month we had low rapport but then we were put together on a shitty assignment and from that point on we became closer. She has a boyfriend (which I "straw manned" a couple times during the last week and a half with the expected reaction on her part) but I am not exactly sure on the state of their relationship. We also have somewhat of an age difference (she's 18, I'm 26). On the plus side, we did worked alone with each other 5 hours a day, 5 days a week, wich gave me the chance to play some game. Standard push/pull techniques coupled with some NLP and the all-important alpha body lenguage and attitude. Also, when she complained she was tired I gave her a good massage on neck, shoulders, arms and hands (thank you, youtube) and the girl liked it so much she started asking for massages any time we had a dull moment. Once she even said, and I quote, "I never taught a massage in my arms could feel so good" to wich I promptly replied "everything feels good with the apropriate touch" (yeah, I'm pretty proud of how that came out). Also, I used the oportunity to create sexual tension telling how I learned that because I used to date a masseuse and using sentences like "one of the many ways I know how to please a woman", or "if you liked that you should see what I can do with a scented candle and some sweet almond oil".
Finally, I used any chance I got to try to forge a deep emotional conection, based on two axis: first, I got her to talk about anything I could think of, alternating happy thaughts with sad conversations in order to use the fractionation technique and express concordancy with most of her view points. Second, I gave her my cell phone to play music while we worked, having previously spread out a few songs I taught she would like in the midle of my playlist ("oh, I love that song, can't belive you like it too... that is so cute", she said...).

Now, on to the point: when we were put on the shitty assignment I mentioned erlier (it was organizing the archive, btw) I "motivated" her by saying something like "When this is over, I promisse I'll take you out to dinner" to wich she replied "You better mean it, because I'll hold you to it". And yesterday, on our last day together, two weeks after this talk, I said "Now, if memory serves me right, on our darkest hour, when we were pinned down under an overwhelming force of outdated financial repports, I recall promissing you a dinner if you saw it through." she repplied "No, really, It's O.K.", to wich I said "I never make a girl a promisse if I do not intend to keep it. But beware, it's just dinner, don't think you'll get me laid, I'm an honored man!". She laughed and said "Yeah, right. O.K. When?" I said "Well, I start a new job tomorrow, besides, I already have some stuff lined up for the weekend. How about next week?" to wich she replied "That's fine, but text me first". And that is the road so far.

Now, my questions are:

1 - Is there anything I should have done differently?

2 - How long do I wait until I text her? Any advice on the text game part?

3 - If I do manage to take her out, and considering our age difference, should I take her to the food court of the local mall, where she will be more confortable, or to the VIP lounge at the top of the city's high-rise, to show her the diference between dating a boy and an adult who likes the good life. Or anything in between?

Thank you all, cheers!

Come on, guys! Help me out!

Do I keep silent until I ask her out? If Yes, how long do I wait? Or do I play standard text game with push/pull, callback humor, etc?

I'll give a beer to whoever helps me get laid

How many hours have you spent with this girl and have you made out with her or fucked her? I hope I'm just confused.

To me it sounds like attraction in the moment and she enjoyed the attention you were giving her, but now that the moment has passed so has her attraction. Girls do that all the time act real interested when they really aren't there could be any # of reasons for it. I would say txt her once say hey how about dinner tonight at whatever lounge you mentioned. If she doesn't reply or reply positively say fukk it and move on. Remember she has a bf and there's a signifigant age difference which are likely contributing factors to her rcent change in behaviour towards you. Aside from that it sounds like you escalated properly. Anyway hope that helps good luck!

Thanks for the advice. I text gamed her two days ago with some sucess, I'll text game her again tomorrow and pending on the results, ask her out two or three days later.

About the place, mall or fancy restaurant?

Dude I can't decide that for you, but use common sense you're not 15yr olds hanging out at the mall. I've never heard of a pua player ladies man or anyone meeting a girl building attraction setting up a date with a girl and then taking her to a mall food court. If you think the vip lounge is over the top tone it down and do something in between, but you gotta decide that for yourself.