It's usually harder to escalate things when you start as friends. Since you probably didn't show interest (sexual one) in her since the beginning, it's better to start acting more as a date than as friend.
First step is surely removing your "friend attention".
By that I mean that if you spend too much time talking with her, go after her asking for advices, listen to her sexual life with other guys or stuff like this, stop as soon as possible. From now on, the communication is gonna be a bit more simpler. Forget your phone (for most time), use it more to set up dates. Unless the conversation is going extremely interesting in there, avoid having small talk on your phone with her.
Second step, which is the obvious thing to do, ask her out on a date
Here goes a few tips. The first one is that you won't ever ask her out in the afternoon or morning. All your dates with her must be happening at night. What's the best time? I usually like going out at 7 or 8pm, because I like going to multiple places at once. By the way, that's another great tip. You can start by having a walk somewhere nice, somewhere you can talk. Then, if things are going well and if you're the drinking kind, go to a bar or pub (remember that asians have low tolerance for alcohol, so don't push her). If things are going good enough, you should probably be making out with her right in there, or at least touching more intimately. That's a good sign. Keep on talking, touching, flirting, back off a little bit, always two steps forward, one back. When you feel ready, tell her "Let's go to my place". That's another important thing, don't ask her, invite her in a leader way.
If she rejects you, don't worry. Keep up with the kissing, touching, as if nothing happened. Remember that it's not by making out with her more (or harder) that she'll change her mind. Keep on teasing, always. Women love being teased, love feeling that she's not on control (on sexual matters), nothing turns her on more than that. If she doesn't bring up the idea of going to your house (or going to hers), you won't be doing it again either.
Third step, which may be the hardest one for most guys, is to let her come to you
If you had a good first date with her, you will feel extremely excited. If you didn't have such a good one, you'll either feel down or fall for the "illusion of action". Don't worry. Let her reach you out, let her orbit you for a while. Think that whenever she comes to talk with you it's because she wants to see you, so your job is making it happen by setting up another date with her.
The things that I described you on the second step can be happening in the first date, but this is a RARE case. It will most likely happen in the second or third one. I know you're crazy to **** her, but always remember that when women feel like you're trying to get sex from her, she won't feel like giving it to you. Keep your cool, go there to have a good time and things will happen naturally. Be bold, don't be afraid to touch her, always keeping eye contact. Touch her when you speak, specially her forearm, hands, escalate on that too.
Eventually, if there's a spark, sex will happen. If she just see you as friend, it probably won't. Yes, you can try to change her perception, but it fail most times. Just be patient and let things happen, always being your best self.
Good luck with her.
