Legalsteel, I can understand what you are going through. When I was 12 years old, my 15 year old cousin, whom I was very close to, died of a rare bone cancer. It was the first time I had experienced such loss, and it broke my fucking heart.
At the funeral, they read a poem which has stuck with me almost 10 years later. I hope that it can offer you the same comfort that it did for me. God bless you and your friend.
"God saw you were getting tired,
The cure was not to be
He wrapped you in His loving Arms,
And whispered "Come to Me"
You suffered much in silence,
Your spirit did not bend
You faced your pain with courage,
Until the very end
You tried so hard to stay with us
Your fight was not in vain
God took you to His loving Home
And freed you from your pain
A golden heart stopped beating,
Two working hands at rest
God broke our hearts to prove to us,
HE ONLY TAKES THE BEST"