YOU SAID:
My boyfriend is made out of dough and I must kneed him.
INTO JAPANESE
私の彼氏は生地でできていて、私は彼を膝で蹴らなければなりません。
BACK INTO ENGLISH
My boyfriend is made of dough and I have to kick him in the knee.
INTO JAPANESE
私の彼氏は生地でできていて、膝を蹴らないといけない。
BACK INTO ENGLISH
My boyfriend is made of dough and I have to kick him in the knee.
That didn't even make that much sense in English.