How about I kiss my best friend?
It sounds a bit risky. Are you okay with wanting to kiss him?
Yes, I know him very well. I am comfortable with him.
The line between friends and lovers is slim and a kiss can ruin a friendship unless it is desired by both people. Have you talked to your best friend about his interests in you?
We agreed to remain being just friends.
There you have your answer then. Sometimes it's best to just stay friends and not do anything that could jeopardize the friendship. Who knows, maybe later on he might start developing feelings for you, but for now, it's best to just respect his wishes.