I think there is an extra layer of sexy when a white women is getting tickled by someone who has different color of skin. Especially if It's a male. Does anyone concur.
I like to see white women tickled by merciless black women. Especially if the white girl seems spoiled and pampered and the black girl is tough and from the hood and knows just the right way to tease and taunt.
I think tickling in general is cool, and there's something "new" in interracial tickling, but at the end of the day it's all good if you're driving someone up the wall with laughter.