Get a piece of paper and some crayons. Draw a bright childlike picture with asmiley sun and two stick figures holding hands. Add labels with your two names pointing to the stick figures. Write "I Love You" inside a heart.
Next get a large formal envelope. Place your drawing inside and type up a formal address label of your partner's work such as:
For the immediate and urgent attention of:
John Smith, Level 20 Collins & Smith Solicitors New York.
Mail it to your partner so he receives it in the middle of a busy day