He and Judy are always together; his hand, carefully guiding hers, a china doll's smile painted on her face as she learns exactly how she can help him. He never yells, never criticizes, just gently corrects her errors, explaining the method once again.
After dinner, they always go for long walks. Their only chaperone is the Robot, and he never says what happens, which just leaves the others to speculate.
Will once suggests that he holds her in his arms out underneath the moon. A logical assumption, perhaps, except for one small thing.
There is no moon on this planet.