This pasta and sauce get thicker as it sits so it’s VERY important to serve right after it’s made. To make the sauce creamier, you can add some milk or cream instead of some of the pasta water.
Cooking water: add pasta water gradually, you might not need all of it. You don’t want to water down the flavor, but only make the pasta nice and moist. If you think the reserved water is not enough, you might add a few Tbsps. of milk or cream
Storage: Store any leftovers in an airtight container. They will last about 4-5 days in the fridge. You can reheat on stovetop or microwave adding a little water, broth or cream to loosen up the sauce, but this dish is BETTER eaten the SAME DAY as it will never be as creamy as it was when first cooked.