What should a guy do if a bbw tries to blackmail him for sex stories?
He should immediately seek help. He could go to the police. Blackmail is a crime, and the police can take appropriate actions to protect him from the blackmailer.
First of all, he must not comply with the blackmailer's demands. He can keep records of all interactions with the bbw. He should reach out to authorities such as the police or a legal aid organization. He might also consider getting support from a counselor or support group to deal with the emotional stress caused by the blackmail situation. It's important to assert his rights and not let the blackmailer get away with this unethical behavior.
The guy should not give in to the blackmail. He can try to gather evidence, like any messages or threats from the bbw. Then he can talk to a lawyer or a trusted friend or family member for advice. Standing up to the blackmailer and using legal means to deal with it is the best way forward.