To make your lipstick last longer you can put lip pencil on before you wear lipstick. If your lips are very thin you can
apply the lip pencil on the outer part of your lips where there is a natural white line.
Beige pencil is appropriate to define the shape of your lips. You could also put makeup on your lips in advance before you put on any colour, this helps your lipstick remain on your lips longer and is useful to create the desired shape.