Balancing Pain & Pleasure—Any Tricks?

Temperature play is one of the best ways to mess with sensations, but finding that sweet spot between pleasure and actual pain takes practice. I learned that dripping wax from higher up gives a softer, spread-out heat, while dripping it closer gives a more intense sting, which makes it easy to control how much burn you actually feel. Also, mixing in ice right after makes the contrast even wilder. What’s your favorite way to mix heat and cold for the best reaction?