The pair both pleaded guilty to one count each of maintaining a sexual relationship with a child.
This is the crux of the matter people, it does not matter if the contract was signed in the presence of a lawyer, because she was a minor. Plus no lawyer would put his name to the paper in this case as he knows that it would be an illegal document.
Its like asking someone to write up a document stating that they are waving their human right to live. Then having a lawyer sign it and stamp it and date it. Then turning around and killing that person in cold blood in the middle of town. Just because he signed the document does not change the fact that it is still murder to kill him.
This is still statutory rape as she is a minor, end of case.