Eh, he was not chosen, so much as chose himself.
He killed her customers (USN soldiers) and later beat up the lesbian who had an interest in her as well as her new pimps / business associates (unclear what arrangement they had). She has survived by using those around her: making them feel good, making them feel protective, making them desire her, etc. It has gotten her money and protection.
Now Akagi has killed or beat all of his rivals, so if she wants to continue to survive using the skill set she has (emotional control) then appealing to him is her only option ( at least for now).
Make of that what you will.