Originally Posted by
Raven
The way they spoke about the King's disposition and the fact that Boa's the only one who has it, it seemed like it was a separate thing from her ability to make people love her. Dunno, just the impression I got.
My guess is that she ate some kind of love-love fruit which gives her the abilities we've seen so far, and separate to that she has the ability to use the special Haki which is what makes her all the more dangerous and gave her the title of one of the 7.
And, if she is indeed Luffy's mother, then she's passed down that ability to him through birth, even though he doesn't know he has it, doesn't know how to use it and occasionally uses it by accident.