Bunya has to take some medicine for a digestive obstruction. After he takes his meds, he gets a papaya treat as a reward. There's always a little up-front protest about the meds before he sucks it back; he clears off the counter, takes his meds, and then gets excited about and anxious for his treat.
Check out the lip licking about 30-ish seconds in.
(If this does not play for you here, it is also posted on the Rabbit Ramblings YouTube channel at http://youtu.be/6wweHIy2D1Y.)