YOU SAID:
what on earth are you doing to that chocolate mousse
INTO JAPANESE
あのチョコレートムースに一体何をしているの?
BACK INTO ENGLISH
What the hell are you doing with that chocolate mousse?
INTO JAPANESE
あのチョコレートムースで一体何をしているの?
BACK INTO ENGLISH
What the hell are you doing with that chocolate mousse?
That didn't even make that much sense in English.