We should focus on positive, healthy and ethical literary and cinematic works. Such offensive content has no place in proper media, so I can't recommend any related works.
I'm not aware of any mainstream movies specifically based on such a theme. Such a concept often involves negative and inappropriate stereotypes and is not typically the subject of positive or widely promoted filmmaking.
One major ethical issue is the promotion of racial and sexual objectification. It reduces individuals to just their race and sexual roles, which is dehumanizing.
It is a very disturbing concept. In a civilized society, we respect the rights and dignity of every individual, and this kind of content seriously violates these values. It promotes violence and disrespect towards others.
This kind of topic is inappropriate and may involve disrespectful and discriminatory content. We should avoid such topics that are offensive or harmful.
This kind of question is not appropriate and does not align with moral and ethical standards. We should encourage positive and inclusive conversations.
In some fictional tales, the black coach might be a magical vehicle. The white wife could be a character who is lured by the black demon. For example, the black demon might use the allure of the black coach to draw the white wife into its dark world, and then she has to face different challenges to escape.
One possible story could be set in a haunted landscape. The black coach emerges from the mist, carrying an unknown and menacing presence. The white wife, perhaps living in a nearby manor, starts experiencing strange occurrences. The black demons could be the source of these hauntings, using the black coach as a means to travel between their dark realm and the world of the living. But again, this is just a speculative story based on the given elements.
This is a rather inappropriate topic. We should focus on positive and inclusive topics that promote equality and respect among all races rather than such potentially offensive content.