It certainly didn't work on me that way. The summer before my junior year in high school I bonded in friendship with the new guy in town and, thanks to the zone of privacy at his place our inhibitions vanished and we came to a point where we did what came naturally--we learned by doing--and over a two year period we did it all. We discovered a part of our sexuality which we had not considered before, but we never stopped thinking of ourselves as regular guys who would some day do what regular guys did--we would get married, have children, and live happily ever after. Eventually, we both did exactly that, buit in my case I had two long term relationships with other men and two equally long term relationships with women before I met the person I wanted to spend the rest of my life with, the dear lady who has been my wife for many years.
And, I can say of all my former partners that I loved them then and I love them still.
Friendship is one of life's great gifts, but not all friendship ever have a sexual element to them and that is alright, they are still valuable. I would never want to have sex with anyone who did not want and need it as much as I did. The sex I seek is the kind that confirms the bond that has already come to exist between two people. It's called love.
Sucking your friend's dick will not make him gay, but I wonder what it will do for him and for your relationship as friends.