Having read through my other replies again I saw that I made the point rather badly, so to clarify: I was responding to the title of the thread, how would a court hearing pan out? Since she was above the age of consent, and the defence will make out that she was just another one of the attractive girls (aka groupies) that Andrew surrounded himself with, what's the case for the prosecution?
Edited to add: Ah, just saw @Handle9's response. It still seems a bit of a stretch for the prosecution though.