Use a rope/string. Make a slip-knot (or similar) around one end and have it around your neck. Run the rope/string down your back and tie it to your balls. Have it tight, so that your scrotum is stretched out and you can feel it on your neck. Edge yourself almost all the way, then tilt your head forward and yank your cock up to give your balls a good pull. Then, completely let go of your cock and sit down on a hard surface so that you're crushing your balls under your body - Ideally an armrest, or similar. Do this three times. Post proof either here, on imgur, or send it to me at Originalname24 on Kik.