Re: Bit of a specific situation (Korean girl)
Well, I'm a strong supporter of honesty in dating, as in "just say what you think", which works surprisingly well. So as for the korean girl, I find her gorgeous and funny, and even though I can't confess to her or ask her to become my gf, because that's not something I do, I am attracted to her. So I will probably tell her something like "Listen [name], you're gorgeous and funny, and even though I am not going to confess to you or ask you to become my gf, because that's not what I do, I am attracted to you, and I am going to kiss you." Said in a very alpha and confident way of course, with your hand in her hair or on her neck, with eye/lips gazing. Feels like a confession, is not a confession, I guess that's a good compromise.
Remember that I haven't done it yet, for personal reasons - she wants something more serious than I can give, and there is this other girl I'm more attracted to - so take it with a grain of salt, I haven't tested it yet. And it has to come in the conversation - talking about relationships is a good start, like asking her "what if the guy asking you to be his gf is not sincere? Isn't it better someone who tells his feelings directly?"
Again, high risk / high reward. I think of it that way: if she doesn't reply positively, even though she is saying all this stuff, and seeing you all the time, well, she would never have said yes. So at least you're not spending time running after a girl who would have never gone with you anyway.
Now, for some teasing examples... Ok, I tried, but nothing I wrote seemed right out of context. Stuff like her saying "I won't bite you, I promise", and you being "too bad, I like when a girl bite me". Or stuff like "size doesn't matter you know? except for sex." or "I would invite you at my place, but I always sleep naked, you're not ready yet", or when she compliments you on your body: "hey, you're not interested only in my body I hope? I have a personality too, you know ", and so on. Basically, casually making kinky jokes, without overdoing it (avoid "that's what she said", or "I hve big hands, and everything is proportional, wink wink"). That's how I do it, because I'm a very sassy/witty guy, and that's what I look for in a girl, so adapt it to your personality
Seduction is a martial art. Reading books and talking to experts is important, and helpful. But you won't progress unless you go out there and fight.