YOU SAID:
I went to the bathroom to deliver my duty
INTO JAPANESE
私は義務を果たすためにトイレに行きました
BACK INTO ENGLISH
I went to the bathroom to fulfill my duty
INTO JAPANESE
私は自分の義務を果たすためにトイレに行きました
BACK INTO ENGLISH
I went to the bathroom to fulfill my duty
You've done this before, haven't you.