YOU SAID:
i kissed my boyfriend on the mouth
INTO JAPANESE
私は彼氏の口にキスをしました
BACK INTO ENGLISH
I kissed my boyfriend's mouth
INTO JAPANESE
彼氏の口にキスしてしまいました
BACK INTO ENGLISH
i kissed my boyfriend on the mouth
INTO JAPANESE
私は彼氏の口にキスをしました
BACK INTO ENGLISH
i kissed my boyfriend on the mouth
You've done this before, haven't you.