I get the occasional blowjob from my wife. There's a big difference, though, in how the blowjob is given:
With me: It's obviously a chore. I have to ask multiple times before it finally happens. The blowjob itself is silent, mechanical, and without passion. There's certainly no attempt at deepthroat. The whole thing is over in 5 minutes. When I cum, she runs and spits it out.
With Black cock: She is completely turned on. As soon as his cock is out, her lips are around it. She kisses his cock all over and then makes love to it with her mouth. She's moaning the entire time and going crazy with lust. She will stop and look up at him, saying things like, "Oh my God, I love your cock!" She deepthroats as much as she can. He nails are scratching at his balls. I'm just in awe watching her. After about 15 minutes of total Black cock worship, she will beckon me over so she can sit on my face while she sucks him.