I have a better idea, while still keeping it interracial...
How about you play the black dude as the MC with his black wife, and he has a 3.5in dick... He's also under the delusion that he has a BBC, and tries to act "alpha as fuck", meaning verbally and physically abusive, while hating to go to work, or help around the house...
Than you have a bunch of different dudes seduce and fuck the shit out of his wife, his sister, and his mother in front of him, all from different races other than black...
1. White dude is a lawyer, he fucks his wife and makes her ass addicted to "white meat", and when they fuck in front of the dude they make funny racist jokes, like how they can hide stuff from him successfully by putting said stuff in his "work boots".
2. Asian Doctor fucks the crap out of his sister who the MC has a crush on, and sends him videos while having a 12 inch asian dick, and mocks the MC for his tiny peepee (he's his doctor so he knows how small he is).
3. Hispanic Architect fucks the crap out of his mom making her scream "MAS PAPI !!" just for kicks LOL
Add in a couple of other people (middle eastern, some aliens, and some fantasy races, even animals that cuck the shit out of him). You may think "this idea sucks and its racist"... but guess what the BBC bull is also racist BS, and worse its OVERUSED, at least this idea is a breath of fresh air.