12, your grammar's off. You're saying something like "Don't show your chest and go!" How 'bout something like おっぱいを見せてくれなかったら出て行け！ Which is like "If you ain't gonna show me your tits then get the fuck out!" Or おっぱいを見せてくれ。それとも出て行けよ。 I think this gives more of a "either show your tits or get out" feel to it.