You thought it was kind of odd for an 18 year old boy to want a balloon, but oh well. Other people had them and you felt like you should get one too. You run your hand over the inflated latex balloon shaped like a donkey. It has silly pointed ears and a stalk of a tail with a little ball at the end for the tuft. Its the best representation of a donkey they could do with a balloon of course. The plastic makes a squeak sound as you touch it.
You feel a tingling at the base of your spine as you walk away from the balloon vendor with your donkey balloon in tow. Its nothing at first and you think that you can just ignore it for now.
Walking down the midway at Pleasure Island Carnival you feel the tingling get a little worse and then suddenly a sharp pain right in the base of your spine, at the top of your ass crack where it meets your back.
You decide to duck in to the nearest space between two buildings and check it out where nobody can see. Reaching back before you, there is something smooth and cool sticking out from above your pants waistline, its pushing your underwear down in the back too.
You grab it and it makes a squeak sound like your balloon did when you touched it. Pulling on it, it wont budge.
You crane your neck around and see that its a balloon, but its growing out of you. You pull your pants down to get a better look and you can see above your smooth pale skin of your ass that there is a brownish balloon tail growing right out of your spine.
Your heart is racing as you see it and feel it with your hands. You can feel yourself touching it, it has feeling, its part of you, but how is that possible? Its made of brownish latex, just like the donkey balloon you bought.
...