2 PRTS: Illustration question: Fixative for heavy, toothy graphite application?/

I’m using a 2B jumbo pencil (LYRA 1772 2B) to apply a heaping lot full of graphite onto certain parts of this picture, and I am concerned, because I don’t have any fixatives to put over it while I work on the rest of the piece.

I draw with my left hand. Since we “write” from left to right, I smear letters sometimes with my left hand while writing. Is there a way to protect those areas from future smearing without having to buy something?