Cousin wants to have sex with me?

Me and my cousin used to fool around when we were kids. Found a dirty movie, wanted to try some of the stuff in that, no actual sex, then we stopped when she moved out because she used to live with us. Her mom was out of state and her dad was in prison.

Anyway, we're older now and she has a boyfriend and a kid. We had a get together after not really talking to each other for some time. We were alone in the dining room at night since everyone else was outside. we were talking and remembering the past, hoping she wouldn't bring up the sexual stuff since that's something I wanted to forget and leave behind me. Well apparently she didn't want to leave that in the past.

She brought it up and joked how stupid and weird we were in the past. I laughed along just to get past the awkwardness. But then she starts rubbing her leg against mine and I shot right up and went to go get some water. She followed and then whispered in my ear. That if we don't have sex soon, even just for one night, she's gonna tell everyone what we did when we were kids. How do I stop her from telling anyone while NOT doing what she wants me to do?
Cousin wants to have sex with me?
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