You're practically burning up and frantically strip off your clothes, but it doesn't help much. You grab the horns on your head again. They don't budge as it seems they are firmly rooted in place. You stagger to your feet, stumble a few steps toward the bathroom, and fall back to your knees again. You feel pressure at the base of your spine, near your shoulder blades, on your chest, and in your feet. You try to crawl toward the bathroom, thinking you might be able to cool off with a shower. You reach the doorway then collapse onto the tile floor.
As you lay sprawled on the floor you realize something strange: you've got a massive erection. You can feel your penis press against the tile and your fever-addled mind tells you that's what you need right now. You reach down and began to stroke yourself, slowly at first but steadily picking up the pace. The pressure mounts in your chest, back, feet, and tailbone yet you continue masturbating. Your heart rate quickens as the pace of your hand continues. If only you could climax all your problems would be solved. You masturbate furiously feeling like you're on the very of exploding in every direction. Then it finally hits you.
It feels like many parts of your body explode outward at once and in a way that's true. A red tail pushes out from your tailbone, several feel long. Your tensing feet reshape themselves into black hooves. Black wings burst from your back. Your chest heaves then surges out, leaving you with a pair of feminine breasts. Most shocking of all your penis and balls crumble to ashes in your hand. From your open mouth comes an unearthly scream. You've transformed into a succubus.