I find it to be horrible what your brother is doing or did to you and as you stated he is sociopath behaviors, if you do not want to call the police, you can try and have him committed to a long term psychiatric facility for his behaviors, especially if you suspect he is trying this with other girls as well. If he is a predator that warrants him to be 'a danger to himself or others' which are grounds for a court commitment to a psychiatric facility.

Just another though or alternative idea?

Take care,
kk101