When you have your partner's upper lip gently sucked into your mouth, we wouldn't want the lower lip to get all the attention. Run the underside of your curved upward tongue along his front upper gum ridge. Think of this as the reverse of where you would run your tongue along the front of your teeth to feel how smooth they are after brushing.
As many men have told me, your tongue in his ear can be a sure-fire turn-on. There are, however, some men and women who do not like a tongue anywhere near their ears. Therefore, it's important to ask early on if he is enjoying it. You might offer a brief hint of tongue, then ask, "Shall I continue?" Most women prefer feeling his tongue and mouth in the triangular area from the edge of the ear and earlobe down to the top of the shoulder.
At any time, when you want direction, stop, look him in the eye and ask, "Is there anything else you'd like?" Or: "Is there anywhere else that needs attention? Just let me know." Then proceed as you wish