I came up with this last night and it worked really well. It makes more sense to use on foreign girls but if you steer the conversation towards something like traveling or language it should work on any girl. I used it 10 minutes after opening and isolating at a bar. You'll need a smartphone.
1. Download a translation app like googletranslate.
2. Talk about how cool and useful the app is and pull out phone.
3. Type a sentence and translate it, I started off with something ridiculous like "I'd like to shrink myself down and bounce on your ass like a trampoline." Translated to French.
4. hand it to her, when she done laughing ask her to write something for you.
5. gradually escalate it back and forth. I stopped too soon this time but I bet I could have gotten some racy stuff out of her if I'd kept going.
If she types "you are cute" or something reward her with a hug and hold her while you keep typing, maybe even translating "kiss me" if you feel it.
It works because you're using another language and it's in written form, plus only she gets to see it so it's like you're having a fun conversation only the two of you can hear. I would use less sexual language in a daytime scenario. Also, if you want to Number Close you already have a phone pulled out!