He's tricky. You do the ear thing until he gets an erection. Then you have to alternate stroking his dick and sticking your fingers in his mouth. Once he's at full mast you can alternate fingering his ass, stroking, and sticking your fingers in his mouth in that order.
Basil is a very picky pokemon.
Oh and if you are having issues getting past the ear part, I find letting the ears flop back down and going for the ears again to work pretty well. Also Basil likes head scratches as well.