You're so loyal I could kiss you *CHUU!*
Your loyalty makes you central to my heart.
|忠実 な or に
someone who is faithful in doing his/her duties. Also means like a movie which is faithful to the book, or a translation which is faithful to the original. Or even a forgery which copies the original dollar bill completely well.
admonishing negative advice: "Don't open that door!" "Don't swim naked!"