That's a long transparent tube! Where did you purchase it please?! ***Henryshoover***
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I've toyed around with the vacuum cleaner and a clear hose from the local hardware store. If the tube is slightly larger than your cock the vibrations caused by the air slipping past are incredible. Kept it up for about 30 minutes once stopping when I was near cumming, starting again over and over again then shot my load. My nuts were tender for several days after that.
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