Brown the sausage in a large frying pan over medium-high heat, Crumble the meat with a spatula as it cooks. Continue frying the meat until you no longer see any pink, stir often. When the sausage is completely cooked, sprinkle the flour on the meat, add the milk slowly stirring constantly. Cook until the mixture thickens. Season with salt and pepper. Serve over biscuits or toast.