Call his bluff
From Create Your Own Story
You stare up at him resolutely, refusing to obey. Then he jams his penis against a nostril and holds you there as he pees.
It floods your sinuses, drips out your other nostril, and you can taste it in your mouth and feel it running down your throat. You're going to be tasting it for weeks. You involuntarily yell, "Ahhhh," which he takes as submission, pulling your head back and finishing in your mouth. This in infinitely preferable to up your nose.
Requirements: This is a story about a young girl written in second person.