Yeah, I know, and I can understand it on some level, but I still find it a bit weird, maybe because I live in a pretty homogenous country and rarely see Black people, and when I do, it's usually when they're visiting as tourists.
I explained it prior. It's sexualized penis envy. "Sexualized" implies it was a non-sexual feeling. Most paraphilia/fetishes are born as a coping mechanism to alleviate a mental strain by sexualizing it.
Simple example: you take a dude who grew up jacking off to too much porn. Only knows black people and specifically black men from porn, develops a strong insecurity regarding his size while simultaneously develops ideas about women's preferences for size from porn as well. He feels "less" and thus becomes envious of black men on the premise that they're all big and thus have it easy dating wise. He develops a fear of being cheated on or left for a black guy because he isn't as big.
The penis envy, the fear of being cheated on and all that insecurity regarding his own size gets sexualized by the brain to lessen the mental strain it has on him.
And boom. You got yourself a BBC cuck. 4chan is full of guys like that. Its 99.99% white guys too. If you add to that a more tense political landscape with topics like immigration and racism, you end up with different 'flavors' of this fetish.
Reason why EK gets so much BBC cucks as her patrons is because she actually tackles those themes in detail lol. She doesn't just make BBC scenes on surface level, she puts Ian into the EXACT same scenarios that create sexualized inadequacy.
Trauma from being cheated on. Has trust issues.
Lena has the option to develop a 'thing' for black guys and cheat on Ian, thus recreating the trauma.
Alison hooks up with Jeremy and actively tries to make Ian jealous.
Ian's only MFM threesomes IS with Jeremy and he has a timed event where he can lose his boner.
When Ian watches porn, the Gilian-lookalike is with a black guy. Bad Jess too. Etc.