YOU SAID:

What are u doing step-bro ;-;

INTO JAPANESE

義理の兄弟、何をしているのですか ;-;

BACK INTO ENGLISH

Brother-in-law, what are you doing? ;-;

INTO JAPANESE

義兄さん、何をしているのですか？ ;-;

BACK INTO ENGLISH

Brother-in-law, what are you doing? ;-;