Caring White UK cuckold male looking for partner

Attractive, intelligent and caring white male living in the UK looking for a white female who likes black men for a long-term cuckold style relationship. Would have settled down long ago but have this deep anchoring to be with a partner who prefers big black men - can't explain it, but that's how it is!
Heterosexual but love interracial sex between black men and white women and want an open relationship where my partner is free to have black lovers while I remain loyal - again can't explain it, but have accepted it.