Girls... Is it weird that my girlfriend and I both really want her to give in and finally experience this?

My girlfriend and I have been together for 5 years. She is absolutely amazing and we have a wonderful relationship. She is very beautiful and I have become use to guys hitting on her and trying to get her number when she is at work or elsewhere with a couple of friends. I am not controlling or the overly jealous type and she respects and appreciates that. She is very straightforward and honest with me about everything and dosent like to hide anything. So a new co-worker of hers has been abnormally persistent at this. I have always known that she is physically attracted to black guys, so I naturally paid more attention to this situation. I asked her if she would like me to say something to him, and she said no she will try and take care of it herself like she usually does. A week later she tells me he has not given up at all. She said, I just do not understand why he likes me so much when he knows I have a serious boyfriend that I would never want to leave, and especially after being shot down a thousand times. I asked her if giving in had ever crossed her mind if this continues to be an issue? She said all she knows is it's really becoming a lot more stressful because he is so nice to her about everything. I said, I know you have a "thing" for black guys, are you attracted to him? She said yes, I am actually. I then asked, what do you think this guy wants from you? She said, if I give him my number he will probably want to date and definitely start having a lot of with me! I said, it sounds like you are mainly interested in that second part! She smiled and said he is really y babe, do you think you could possibly be ok if I let myself give in? And does it turn you on knowing now that I want to? I said yes, the thought of you giving in this time really does turn me on a lot! I love you more than anything no matter what, and if it happens, you know I will respect and support your decision. I told her this is the best opportunity for her to finally satisfy her curiosity! She said, being completely filled up by a well hung black guy has always been my biggest fantasy! I told her that I have been fantasizing about you giving him head everyday at work since you first told me about this! She smiled and said, if he asks me for my number again, which I know he will, I'll be more than happy to give it to him for you!