Have been taking a VI guy in his 20s for weekly rides for about six months now and from the start it's been a real blast. His fitness level is quite high so he took to the tandem very easily, no worries about fatigue or unsteadiness, he seems to have mastered sitting still and correct pedaling technique very quickly. I keep him informed about our surroundings, what type of vehicle just passed us, sheep or cows in the paddocks/meadows, but in general we chat about everything and anything. More often than not we're laughing our silly heads off!!
The most amazing thing is we have very quickly developed an uncanny sixth sense between us, as in, I will change the gears up or down as I feel necessary just as he is about to ask me to do that, he will ask to stop pedaling to raise his butt for a rest just as I'm about to suggest that, etc etc
Wish I had taken to tandeming years ago.