" I’d say that of the two choices, Helen will be safest if she finds her own way back.”
“A girl traveling alone on a voyage that long?” Castor protested.
“I’ve done it before,” I reminded him. “Not as a girl.”
“Yes, well, er, a few things have changed about you since then.” His face turned a little red.
“I know how to count days and watch the changing of the moon,” I replied. “I won’t be taken by surprise again, even if I have to spend every day of the voyage wearing a--”
“All right, all right, I believe you!” Poor Castor couldn’t wait to drop the subject. “You’ll travel as a boy again. Fine. "

― Esther M. Friesner , Nobody's Prize (Nobody's Princess, #2)