Since 2010, teenagers have been starting to get odd magical diseases at the age of 14. Once there body's begin to develop, they start to get even more of their changes to lead their bodies in pain, and pleasure. Of course, the teens who get this disease can't control when they build up, and go down at all.
The Diseases:
Futona: The disease of when teens become shemales at age 14, and start inflating their naughty bits until they begin to cum.
Bimbitus: The disease of when teens start to become a bit more horny, if they start having sex at age 14, and are unable to control their lust for cum.
Machona: The disease for teenagers who develop getting muscles at age 14, and can't stop growing, until they eat something with sugar inside it.
Smallitus: The disease of those at age 14, when they start to remain small if they don't get enough sleep, leaving them as a shrunken person.
None of these diseases lead to death, but they are very dangerous ones that could immobilize how the teenagers move, and keep them from having a normal life if they react to certain things. Of course, you obtained a disease yourself, when you got to that age.