In a large soup pot heat the olive oil over low heat. Add onion, bell pepper, garlic and cook stirring occasionally until the onion and pepper are soft.Add the rice, red pepper flakes, salt, tomatoes and water to the pot and bring a boil. Cook until the rice is almost done, about 10 minutes.Stir the coconut milk into the soup. Bring to a simmer and then stir in the shrimp. Simmer, stirring occasionally, until the shrimp are just done, 3 to 5 minutes. Stir in the black pepper, lemon juice, and parsley.