You cannot have the privilege of doing so now.

Open the note, take the chalk, and do as I command you." Worms will turn, and even meek, mild, obedient little souls like Cecily may be goaded to the point of wild, sheer rebellion.
"I--I won't!" she cried passionately.
Mr.Perkins, martinet though he was, would hardly, I think, have inflicted such a punishment on Cecily, who was a favourite of his, had he known the real nature of that luckless missive.

But, as he afterwards admitted, he thought it was merely a note from some other girl, of such trifling sort as school-girls are wont to write; and moreover, he had already committed himself to the decree, which, like those of Mede and Persian, must not alter.

To let Cecily off, after her mad defiance, would be to establish a revolutionary precedent.
"So you really think you won't ?" he queried smilingly.

"Well, on second thoughts, you may take your choice.