YOU SAID:

I will pee on your boyfriend

INTO JAPANESE

私があなたの彼氏におしっこ

BACK INTO ENGLISH

I pee on your boyfriend

INTO JAPANESE

私は彼氏のおしっこ

BACK INTO ENGLISH

Is my boyfriend pee.

INTO JAPANESE

私の彼氏のおしっこです。

BACK INTO ENGLISH

This is my boyfriend pee.

INTO JAPANESE

これは私の彼氏のおしっこです。

BACK INTO ENGLISH

This is my boyfriend pee.