In saucepan, heat amount of liquid as directed on packaged couscous mixture.
Meanwhile, heat oil and 2 tablespoons butter in large skillet. Add garlic and pepper flakes; cook 1 minute. Add shrimp; cook 6 minutes. Remove shrimp with slotted spoon to plate; keep warm. Reserve cooking oil.
Add wine to couscous liquid in saucepan. Boil 1 minute. Add remaining butter, juice, salt, pepper, parsley. Finish couscous, following package directions.
Spoon couscous on platter. Add shrimp. Drizzle on oil from skillet. Garnish with lemon wedges. Makes 6 servings.