Just as they start walking again, David felt a horrible pain just above his butt and gasped, eyes going wide, and his hands swiftly grabbed his butt.
"Oh no!" cried Ben, "Not you too!"
"Gahh!!" cried David, wincing. "No, no, no! Please! What's happening?"
"You're getting a tail too!" said Jeff
David didn't want to believe it. He took a deep breath and took a few more steps.
"N-no... No. I'm good, I'm not GROAHHHHAWWW"
David caught himself on a counter, back facing his friends. He winced again as he felt the pain get worse in the back of his pants. At first his friends couldn't see anything, but a few moments later, his pants slowly started tenting, the start of a tail pushing the fabric.
"Nooo!" sobbed David in pain and fear, "Please!! I don't want a taihawww!!!"
But the more David pleaded and sobbed, the more his tail painfully grew.
"Gahh! Nooo!!!" he cried, face wet with sweat and tears.
His friends looked on in horror, not sure what to do.
"H-hang in there Dave," said Ben, "I-it'll be over soon."
David's legs shook and he found himself bending over more and more. Finally, he was unable to steady himself on the counter any longer, and he fell to the floor on his hands and knees.
"Heeehawwww!" he cried "Heeehawwww!!"
Jeff and Ben watched as his pants tented more, inch by inch. David grunted and moved his legs apart, trying to get some relief from the pain. Finally his pants were stretched to the limit and little ripping sounds could be heard where the seams were straining to contain the new appendage.
"I want to go homhawww!!!!!" he brayed as his pants finally split open and a beautiful, gray donkey tail forced its way out.
He stayed on his hands and knees for a bit longer, his tail growing a bit more. He panted and after a few minutes, everything seemed to stop. Shaking, David stood up and looked at his friends.
"You okay, David?" asked Ben.
"Fuck... let's just keep fucking moving..."