bf wants to suck bbc?

Okay, so my boyfriend told me when I met him that he was into watching me fuck a black guy. At first I didn't understand but after he told me why it turned him on, it started to turn me on too. Now we're 100% ready for this. My question is, should I be worried that he wants to please my bull? He wants to suck him off, should I let him? He says he's given a guy a blow job once before but he's obsessed with bbc's. I'm honestly not worried, we're all animals, I was just wondering if I should be...