Wow, I'm glad it inspired you. The fic is gorgeous and it fits the atmosphere of the header very nicely :) *hugs right back* More fic would be even better. I'm so so happy that it gave you many great ideas. That's an amazing compliment.
The writing is a brush from Sanami. I didn't actually know it was from a song, I just found it perfect for the message I wanted to send. It fit perfectly with the look on Brian's face while looking into Justin's eyes, and the underlying message of Season 3 - Justin will always love Brian, no matter what. So yes, Sanami holds the credit for the text.