Well, if it's for YOUR birthday, she should fuck a BBC in front of you, not just offer to take pictures, or video. She should get into 69 position, with her on top, and the BBC should fuck her, inches from your face. You should be able to lick her clit, and if he strokes a little too far, and slides out of her pussy, his Big Black Cock, covered in her juices might just "accidentally" slide into your mouth. But even if that doesn't happen, you are sure to get a VERY fresh Cream Pie when they finish!
That's my idea of a birthday present! Although video will suffice if she's not willing to fuck him in front of you.