My sister keeps blackmailing me, what should I do?

Anonymous
So, a long time ago I used to talk dirty with this black guy. I told my sister about it ( which was a terrible idea by the way ). Ever since that day, she's been blackmailing me. She would threaten to tell my parents if I don't do something important for her, or when she gets angry with me. What should I do? And no I can't tell my parents about it. And I don't have anything on her.
My sister keeps blackmailing me, what should I do?
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