You file a police report. Then you file a complaint with the State Bar.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Your post does not discuss the actions that you consider to be sexual harassment by the attorney. More would need to be known to assist you in that regard. However there are rules of professional conduct that prohibit an attorney from using his or her position to exact sexual favors. If that occurred, there are several options available to you. One is to report the conduct to the police if the conduct rose to the level of criminal actions. Another is to report the attorney to the California State Bar who will investigate the misconduct and discipline the attorney if it is found that he acted as you claim. The third is to file a lawsuit if you can prove damages from the misconduct.
Your post suggests attorney blackmail but the facts are not clear. It is not necessarily unlawful for an attorney to put pressure on you to accept a settlement if that settlement is in your best interests. It is not lawful for an attorney to threaten to expose you to embarrassment or to expose certain confidential facts he or she has learned about you to compel you to sign a settlement agreement that you do not wish to sign.
Good luck to you.
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