This might not be the exact right place to post this but it includes a lay.

Here's the story. I was on a trip with my sister where I met this asian HB8. I got her number and we went out a week after that. Didn't use any PU stuff, the girl was into me anyway. However, I was leaving the day after for 2 weeks and even though she wanted it tonight, for some reason I restrained myself. Two weeks later I call her again and we meet. This time it's on. Everything goes as good as last time, I take her to a couple of different places, she laughs, we make out and I take her home.

Everything is great, she says she doesn't want to go, we cuddle and make out some more in the morning. She leaves but I wait until the next day to contact her again and she doesn't respond anymore. I kind of liked this one a lot so I'm really struggling here to understand the situation. It's been 3 days without response and I'm wondering what you guys think. How do you proceed in such a situation? It's very confusing because everything went really well. I suppose it might be the fact that I waited until the next day to contact her but this seems a bit too extreme a response.

They hardly show how they feel. But, when they do, they only show the good feelings, never bad ones. So she might have second thoughts even before she left and you would probably not know it. But for my answer, let's think this is not the case and she did feel good all the time.

Another thing is, being realist, how many men do you think she has around? An Asian HB8 craving for sex from an occidental is 'normal', I read somewhere that, for them, we are the actors of the movies they watch so there are many fetishes about us. So I would not be surprised if she had more men like you. Or maybe she just wanted unattached sex for one night and you don't have much to do. Most Asian women don't get more attached when having sex.

I have been practicing with Asian women recently and learned a lot, but I'm not sure if you mean she has Asian background or she is Asian and moved for work/studies recently. How recently she came is also important as she can have gotten used to the culture or still getting surprised of how different everything and everyone is.

FWIW, I would have proceed in this way: show her how much you want her. This means looking into her eyes, deep kisses, biting her neck, putting your hands all over her, etc. But don't show her the feelings you should't have. And DON'T make her feel like you are falling for her too fast.

That's in general, specifically, you should build massive comfort after the sex without expressing neediness and bridge to the next day.

Massive comfort after sex
If you hug her and tell her how good it was and that you like her a lot, you are doing everything wrong. First time you do it should be sexy and fun. Kidnapping routine fits here. If you don't like canned routines either, at least you have an idea of what kind of talk to have there. Example: after sex, you both look up to the ceiling. Then you move away but lay on your side (facing her), point at something and say:

Me: "Wow" [look surprised and wait 1 sec until she looks at it] "I used to have one of these when I was a kid."
She: [looking] a toy car?
Me: No no, the snow waterball of the eiffel tower. I remember that we went on a trip to Paris and I buy it and I could be playing with it for hours. [pause] I haven't been there for ages and I loved going there, if you are not careful I will kidnap you and take you there . But we would be in the room having sex for hours and I wouldn't be able to see the city again." [Face of thinking and then a face of 'my condolences', but obviously with half smile.] "Mmh, sorry, you cannot come, I will take my cat "
She: "Heeey!" [Tries to look angry/sad but laughs afterwards. If you get the soft arm punch, everything went smooth.]

Perfect if you have done it more than 1 time that night. Obviously, everything is said really C&F but it builds comfort because it's not C&F jerk mode, it's soft C and hard F. The important thing is to keep yourself consistent. And to know that it's almost impossible to find a woman who wants a serious relationship out of the bat, so don't keep it serious. Nor do the exact script, it WILL vary, and you should have your own (real) story so you assure to keep consistent. I find easier never to lie.

Bridge
I don't think this is needed to be said, it has been covered hundreds of times, but at some point while you are together, tell her that you want to see her again and ask her when she can. My order of preference:
1. After sex in the comfort building.
2. Before sex or sexy time.
3. Just before she leaves.
4. By phone.
5. Never.

Me: "I won't take you to Paris, but I want to see you again. When are you free?"
ATTENTION, shit test.
She: "Why do you think I want to see you again? "
Me: "Oh okay, then nothing " [move your arm away. Make her feel 'kiddingly' that she can loose you]
She: "..." [cannot handle my shit test]
Me: "No, seriously." [stop smiling so much but keep a light smile. Look her deeper and maybe move your hand up to caress firmly her side/back neck while asking it. Basicly, show passion, but not neediness.] "When are you free?"
She: "On Tuestday"
Me: [thinking] "I cannot, let's go on Wednesday?"
[More and more. NOW you can go back in C&F mood while dealing with the dates]

Object
Mistery said about giving her an $1 necklace, bracelet or ring to make her think about you every time she sees it. Never tried, but seems like a good idea.

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I'm not English so I might make minor mistakes and make some sentences sound a little weird.