My wife's younger black coworker told me the first time he fucked her he got all of it in except for about an inch. he says she told him just to cum in her and that would get her off. He said he fucked her again and got it all in her.
Same with my wife, I knew she was getting 10" of black cock from her younger co-worker but she would never admit because she didn't want to hurt my feelings even though I told her I was OK with her getting what she needed.
If my girlfriend told me that she needed bbc for sex. I'd totally agree with her. I want a bbc to experience her perfect butt and pussy. I would tell him that he deserves the sexual pleasure.