I have NEVER cum from a blow job EVER! I know that I must be a unicorn, but I've had women who've curled my toes and had me in Mouth Breather mode, but never bathing her tonsils without me jacking my shit to assist. It's gotta be 95% mental on my part, I'd think.
I've dealt with Native American, Jamaican, Puerto Rican, Mexican, Korean, Japanese, White American, German, and Sistas. I've had my very best experiences with my own people.
It's been with Black American women who've taken me to the edge of the cliff. In fact, I only reciprocated the pleasure with the Black women, the PR, one White girl, and the Mexican MILF because I COULD NOT believe the pussy control on her. And she was one of those who took great offense if YOU didn't cum. That Chica would go into interrogation mode!
To ME, Black women give the best head.