Sandra, a friend of Jennifer, opened the backdoor. She was wondering why her friend didn't come out of her house because it was about time to go to school. Sandra walked up the stairs and entered Jennifer's room. She was speakless, when she saw a jackass standing in her best friends room. "Oh my God!", Sandra said after a few seconds. Then she recognized, that the jackass was wearing remnants of clothes. It was Jennifer's favourite dress. She also noticed the blond hair on the head of the jackass an she began to realize, that that jackass somehow must be her friend. "Oh my God! Jen, is it you?", she asked completely shocked. Unable to speak Jennifer just nodded her head. "We will find the person who did this to you and turn you back to normal.", Sandra said and stroked carefully over Jen's neck. "I'm afraid, you won't be able to do so. In a few seconds you will join your friend." Sandra turned to the voice it was Kyle. "Kyle? Did you do this to Jennifer?", she asked. "Transform or dare?", Kyle asked. "What do you mean?", Sandra was confused. "Answer my question!", Kyle asked again. Not knowing what Kyle meant Sandra just said: "Transform. But what are you talking about? I don't understand." "Oh, you will understand in a few minutes.", Kyle answered and then left Jennifer's house with an evil laughter. Sandra turned back to her transformed friend and noticed in shock, that her jackass cock had began to stiffen. Jen, the jackass moved over to Sandra and started to lick her. "Oh my God! You seem to be very excited about my presence here. I better should leave now." Sandra wanted to leave but in a matter of seconds her feet began to ache terrible. Her feet seemed to grow and pressed against the leather of her boots. With a loud rip, her toes ripped trough the black leather of her high heeled boots. Sandra looked with shock to her feet and noticed that her toes started to fuse together. Than she felt something strange in her ears. She moved her hands up to touch her ears and shrieked when she noticed, that they had grown out several inches. Sandra ran to the next mirror and was shocked, when the saw her body changing. It became clear to her, that she was becoming a donkey as well. "My God! Now I know why you are so excited about my presence, Jen. I'm becoming one of your kind. You must have smelled me. Seem you will have you peronal mate soon.", Sandra said and started to cry while grey fur started to grow all over her body. After a few seconds a small nub started to grow at the base of Sandras spine. The pressure was horrible and with a loud rip Sandra's new donkey tail fought a way out of her tight denim jeans. Sandra screamed in pain. Her body gained weight and forced her to all fours. Her growing ass ripped her jeans more and more appart. Sandra's nose became more sensitive and she started to smell Jen. Lead by instincts Sandra lifted her tail. That was the sign for Jen to mount her friend. The still transforming Sandra cried in shock, when her once best friend jumped onto her back and pressed her cock into Sandras now wet Vagina. "Noooo! Get of of me!", she cried but Jen didn't care. Jennifer started to mate with her friend and after some minutes Sandra started to enjoy it. Her human cries of pain and shock soon changed into animal grunts of lust. Jen pumped and pumped her cock into Sandra's depths. Sandra's teeth now grew and her jaw and nose elongated slowly into a donkey's muzzle. Her bones and organes shifted in her inside making her a donkey more and more. Her chest and belly gained size and forced her shirt to rip into shreds. After a few minutes Sandra was a complete jenny having fun with her jackass. Both of them have lost all their human memories and intellect. They now are just lead by their animal instincts.