She's no one's wife or gf if she takes bbcs. She's theirs. It's r acist and wrong to say white women or girls belong to anyone except bbc that have a right to them.
A guy told me a story similar to this where he wanted his wife to be with a black guy she refused. So he found a few well hung guys gave them a key and a camera and filmed it. Later they came back for more now she's addicted to big black cocks.