Well, indeed I was lucky
But is one of those things were our behavior influences the 1 in a billion chance. Who knows how many "straight" guys are there that would be willing to try with a friend that is close enough?
Yes, we went further and if I see there is interest, I am motivated to go on telling the story.
...and yes, we are still best friends and luckily our relationship did not deteriorate after crossing this line.