First get some fresh ginger, cut two chunks off and use a fork to toughen up the cut edge a bit. The fibers should be sticking out. Then pull back your foreskin and sandwich your head between the two pieces of ginger, cut side touching your skin. Rub the two pieces around but keep enough pressure so you’re effectively squishing your head quite painfully. When my old Master made me do this to my clit I ended up crying. If the feeling is pleasurable for you, edge five times. After each edge put an ice cube on your head to cool it down lol. To end, Tie a rubber band above your balls so they’re forced down. Now sit over a bowl of ice water, balls in the bowl and masturbate to edge ten times. I’ve heard that this makes your balls burn.