Well damn. No one told me this was a girls-only thing.
Guess I'll just have to stop making out with my bros now.
I have seen that as well, to be perfectly honest - a girl giving her own brother a kiss on the mouth.
Like a normal kiss, not a tongue kiss? That's not that weird is it? Like when you're with girls who are just friends and you say hi/goodbye sometimes they also just give a kiss on the lips instead of on the cheeks. I guess it extends to siblings as well.
This twenty-year-old boy was distinguished from childhood by strange qualities, a dreamer and an eccentric. A girl fell in love with him, and he went and sold her to a brothel...