YOU SAID:
I am in love with my step-sister, Angie.
INTO JAPANESE
私は義理の姉アンジーに恋をしています。
BACK INTO ENGLISH
I am in love with my sister-in-law Angie.
INTO JAPANESE
私は義理の妹アンジーに恋をしています。
BACK INTO ENGLISH
I am in love with my sister-in-law Angie.
You've done this before, haven't you.