Bring a large pot of salted water to a boil over medium heat. Add the pasta and cook to just-shy of al dente. Remove and reserve 1 cup of the cooking water.
Add the shrimp, the seafood seasoning and 1 sliced lemon to a medium bowl and toss to coat. Reserve.
Over low heat melt the butter in small pot, then stir in the garlic and red pepper flakes. Let cook and bubble gently for 10 minutes. Chop the parsley and set aside.
Heat large skillet with 2 tablespoons of olive oil over medium-high heat Add the fennel seeds and the shrimp with the lemon slices. Cook until the shrimp are pink, about 5 to 6 minutes. Stir in the white wine or vermouth and the juice of 1 lemon. Transfer to a serving bowl and garnish with parsley before serving.
Drain the pasta. Add the pasta, reserved cooking water and butter to a pasta bowl and toss until the liquids are absorbed by the pasta, about 1 to 2 minutes. Season with salt and pepper, to taste, and serve.