YOU SAID:

I like to eat my popcorn on top of my sister

INTO JAPANESE

妹の上でポップコーンを食べるのが好き

BACK INTO ENGLISH

i like to eat popcorn on my sister

INTO JAPANESE

私は妹にポップコーンを食べるのが好きです

BACK INTO ENGLISH

i like to eat popcorn for my sister

INTO JAPANESE

私は妹のためにポップコーンを食べるのが好きです

BACK INTO ENGLISH

i like to eat popcorn for my sister