YOU SAID:
i steal you girl make her my mistress
INTO JAPANESE
私はあなたの女の子を彼女を私の愛人にする
BACK INTO ENGLISH
I want your girl to make her my mistress
INTO JAPANESE
私はあなたの女の子に彼女を私の愛人にしてほしい
BACK INTO ENGLISH
I want your girl to make her my mistress
That didn't even make that much sense in English.