While the spaghetti cooks, prepare the shrimp. Heat the coconut oil in a large skillet over medium high heat. Add the shrimp and cook them until they are pink and opaque. While they cook, flavor the shrimp with the salt, pepper, lime zest and lime juice. Once the shrimp is done, remove them to a plate while leaving the liquid behind. The spaghetti should be just about done at this point. Drain it, then toss it in a large bowl with the Sriracha, sesame oil, the shrimp cooking liquid and the dressing. Arrange the noodles on a large platter, then arrange the shrimp on top of it. Sprinkle the bean sprouts and scallions on top for garnish and serve family style immediately!