Ah. Well, you didn't say whether or not she said yes or no, but you described how you felt so I guess we assumed based on that that she had said yes. I'd say just talk to him, get him to notice you, act normal around him and see how he responds. Maybe hinting at how you feel would encourage him to ask you out and if not then you could just try telling him flat out.
If it works out think of what you could gain and if it fails what would you lose?