Magic mug godmother request - Cap or not cap to be my super godmother?

original idea to announce this great news around you, to request a godfather or godmother Nice mug with thermo-magic effect, will be to offer to the future godfather, to the future godmother, to the future grandmother or to the future grandfather the mug is black when cold. Pour a hot drink and the message will appear as if by magic - Ceramic mug with thermo-magic effect - Hand wash recommended - Protect from the sun (not UV resistant) - Capacity approx. 300ml