For times when you feel Naughty AND Nice, I bring you the Angel-Devil. This pair will transform from Human, to Horned, to Halo, and back again, all at your command. Just type in "Good" for the Halo, "Evil" for the Horns, or "Normal" to have neither. Each action is accompanied by a sound effect and some brief animation.

BTW, despite it's listing, the Angel-Devil set is usable by both Men and Women. So buy one for your sweetheart!