You seduce her if you are approximately the same age.
Treat her in a loving and respectful way and do it because you desire love (not sex).
Most women can be seduced this way if you care and treat them correctly.
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It is unlikely that a 16 year old boy can romantically charm a 20 year old girl. If you are dead set on her make sure that you talk to her, that you listen to her, and that you treat her as well as you possibly can. My advice, however, is to wait until you are both older or try and meet a girl your own age.