How can I build sexual chemistry with a guy in a subtle way?

We're friends. We see each other once a week or once every 2 weeks. We talk on the phone maybe once every 2 weeks. He compliments me, I compliment back. a lot of girls find him atttactive, including me. He is probably a 9 to most girls. He called me elegant, which basically means non-sexual. How can I build my sexual appeal naturally?
How can I build sexual chemistry with a guy in a subtle way?
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