Good point, aside from some of the games they might play this could be something to help with that, I also notice how they squirm a little when the pump starts. I am not sure if that is just a sound effect or some sort of high volume (high flow) pump. I also find the idea of cow milking machine use to be fun and would love to try it. I heard a rumor that they help with things like ED. Maybe all of that sucking and squeezing from a cow milker is better than I imagined. I never did it so I can just speculate on how good it feels. Thinking about that or the pumps those twinks are kept on is hot really.
A cow milker would be more fun. I would love to feel one sucking and squeezing my cock. Also thinking of how tight that must be it would work on smaller cocks or thicker ones with no modification needed.
The three boys were so helpless when they were operated by cock suction pumps and they danced by twisting their Legs infront of the audience due to orgasms their cocks.