Oh man, this is the genius post. I was just about to say the
same!
If she"s just 15 , just bring her to a meal. Dont have to give her
anything special man. Probably, a bag? Or something she needs,
otherwise if you want to be sentimental. Get a bracelet with both
your names engraved on it or something. Otherwise, Strip yourself
naked and tie yourself using a ribbon and give it to her. Remember
to package yourself in a box and ask fedex.