Well, since in daygame I usually open directly. Sexuality is already there. Example:
Me: Hi, I just couldn't pass by without walking up to you, because you're absolutely gorgeous, my name is In$tinct.
HB: I'm XXX/Awkward laugh/Oh well thank you.
Anyway, they usually are a bit awkward...
Me: What, you don't really get approached like that?
HB: Well yes...
Me: Too bad, but you really looked like someone who's adventurous.
HB: bla bla bla
Me: So are you up to something really cool and insane?
HB: What do you mean? * In Hungarian, this question is asked in a way, that should be translated literally like "what are you thinking?", * hence the following:
Me: I'm thinking about sex, but how does that connect to here?
HB: laugh.
Me: a) Now I really have to go but it was very nice talking to you. Give me your number so we can continue *gives phone to her*
From here, I will continue escalation through text.
b) Let's go somewhere more comfortable to talk.
Usually this leads to the following main responses(or something similar)
1) I'm actually in a hurry....
Cool... then you just #close and leave.
2) You're very kind but I've got a boyfriend.
Me: Awesome. I've got a goldfish. The four of us should hang out sometimes.
Note: If she really has a boyfriend, chances are you won't really be able to close, or she will flake.
3) I was actually going to the mall/coffee shop/whatever.
Me: Well I was going to the (something nearby that thing, but NOT to the same place). Let's go!
4) Okay...where?
Me: Follow me.
HB: Where are we going?
Me: Just follow me!
...
Me: We're going to the (place you are going to) by the way. What were you thinking?
After you arrive, you can start building some comfort and occasionally bring up the topic of sex. The key is really to do it more and more often as the conversation progresses. And then when you got her number, you can continue sexual escalation by text. The instant date is good because you can build comfort too thus sexual escalation in the texts will be much much easier.