I love alternating sensations of hot and cold when I masturbate. I begin by pinching and tugging my pink round nipples to wake them up a little. I ice them with frosty ice cubes straight from the freezer, which shocks them at first, but that's why it feels so arousing. As I rub ice continuously onto them, they become rock hard and very pointy. I treat them with the ice until they start to feel slightly numb.
Next I light a candle and drop molten hot wax onto my hard cold nipples. Again, the contrast in sensation is incredible. I cover them well with the wax and let it dry before peeling it off and feeling my nipples hot and soft. As they are still very warm, I rub ice over them, and in this way I alternate the wax and ice several times. By about the 4th or 5th dripping of lava-hot wax, my nipples have become insanely sensitive, so I put the ice and candle away and just roll them between my fingers. As I do this, I feel my juice seep out and flood my underwear and my clit begins to throb and pulsate.
At this point I insert a long vibrator in my ass and begin to stroke my clit. It is a matter of seconds before I shake and shiver and convulse in ecstacy, and I can keep orgasming as long as my hands permit.