YOU SAID:

I wanna make woopie with her cushions

INTO JAPANESE

私は彼女のクッションでウーピーを作りたい

BACK INTO ENGLISH

I want to make a whoopi on her cushion

INTO JAPANESE

私は彼女のクッションにウーピーを作りたい

BACK INTO ENGLISH

I want to make a whoopi on her cushion