Awwwwwwwww! That's so cute! Yes it has happend to me! My old rabbit Baby whom I loved more than anything in the world, she use to lick me all the time. Whenever I called her name, she would come running to me and would lick my nose and everything.

And she licked me because she was happy and loved me back. So I think your bunny is licking you because he loves you It's so adorable. When a bunny licks you, then you truly have all its love and trust