Firstoff, you buy a big gorilla suit. With a slit in just the right place.
Then, you pull up to her elementary school, and just as she's getting out to get onto the school bus, get out of your car, charge at her while beating your chest, and howl "ARRRROOOOOO!!! I'M COMING TO RAPE YOU!!! AWWOOOOO HERE COMES SOME RAPE!!!" Then, consummate your relationship with her in the most savage fashion.
Be very careful though. If your sexual rage goes too far, surely you will crush her pelvis, and you will lose your chance for something really really good.