The passage is incorrect.
Pens are sometimes licked (applied saliva to the ball end of the pen to promote lubrication and continual, unhindered application of ink from the cartridge inside) in order to keep a "strong", efficient and consistent, flow of ink.
Pencils work on the basis of smearing graphite deposits onto the surface of the paper. Licking the end, or any portion, of a pencil will do nothing to improve its functionality.
Sara is a proper name. Sari is a proper name.