The vibrating plug sounds great, especially if it's remotely contolled. You can slow or speed it up depending on his arousal. Make it last as long as you have time for, never mind his drooling :)
I agree to the wand making it a bit easy for him to cum. Let's just drive him insane with the plug before finally having some compassion.... finally means not for a while. 
I'd like to vary the intensity of the tit clamps too, perhaps just turning them thorugh 90 degrees once in a while, perhaps this will take his mind off the vibrating plug long enough for his balls to forget to churn and delay the end result. He's 19. There's no rush!
