Janet Mason is the legend... part amateur, part pro, Janet started her own website and was pretty much black cock only as a personal preference. Since then she has made it a point to work with every huge black cock in the business.
Julia Ann is a blonde bombshell in porn for a long time. It took a while for her to go black but once she did it was like white cock wasn't enough any more. Killer bod with supreme milf status...
Flora... who? Flora is basically a softcore model who did a series for Hegre Art with a black male model. While is probably wasn't a requirement of the photoshoot, she couldn't help herself and joyfully stroke the black cock all through the session and a few massage videos. Finally she had to put that hard cock in her mouth for a nice blowjob and jacked him off to orgasm. It wasn't hardcore sex like usual but the whole build up was so erotic...
There have been so many others that deserve honourable mention, some have done many scenes, some just a few.