In the chemistry class, Miss Taylor spent a practical test, where she handed over some substances that they should use in order to produce some reactions that she would designate during the class.
The experiments would be done in pairs, which made it easier for Jen and Claire to act together. The first reaction that the teacher asked them to do normally, but on the second they decided to see what would happen if they mix a pill in the substance inside the laboratory flask they were using. Jen then spit out a pill and put it in the bottle, which reacted immediately, first forming a foam in the smoke and then giving off smoke, which was not very dense but had a sweet smell that can be smelled in the entire classroom. The smoke also had the same transformative properties as the pill and everyone who breathed it were transformed.
"It smells good, but I'm sorry to say that you made a mistake in your practical test." Ms Taylor, who was close to the sisters, said. Immediately all of the fingers on her hand lengthened and her skin retracted, a more spherical part grew at the base of them leaving her with 10 dog dicks in her hands. Then she put out her tongue, which stretched and arranged became rigid and cylindrical with a heart-shaped point, clearly a two-foot horse dick. The legs then merged into a long tail and several pairs of breasts grew below the originals, taking all the way to the tip of her tail. Finally her vagina grew to become huge.
The nine-dicked girl from before underwent a new transformation with her entire body growing proportionally until she was two feet taller, with short, whiteand black-patterned fur covering her entire body just as a long cow's tail grew over her ass, her feet became hooves and a pair of horns on the head of the now bovine girl. The trio of dicks between her legs became bovine, her breasts tripled in size and a fourth dick grew along with another pair of balls in each. To complete an udder grew on her belly containing four more dicks and pairs of balls.
A nerdy boy who was at the back of the room melted with clothes and everything became a misshapen blue goo, then resuming his human form now being a slime-dickgirl, slowly stroking her hard cock.
Like it or not, as they were in the classroom Jen and Claire were affected and transformed as well.
All of the pussies on Jen's body closed, then she grew until she was 20 feet tall. Her body was then covered with scales while a reptilian tail grew on her, her legs totally changed her joints her arms became relatively small for her body, which ended her transformation into a tyrannosaurus-girl with a trio of vaginas forming between her legs. Even after the transformation she could feel that Claire was still her dick, even felt her transformation.
Claire had her arms and breasts absorbed completely by her body, from which the top part grew and took on a cylindrical shape. She realized that she was taking the form of a dick, but this time she lost her sight and hearing momentarily when her head became the tip of the dick. For a while all she could do was feel her body changing and realized the dick that her top half had become split in two, then another pair of testicles appeared in her ballsack. Only at the completion of her transformation Claire regained the senses had she lost when her face on the front of her ballsack.She looked up and saw that the top half of it had become two 9 feet dicks.
Jen was very excited when her transformation ended but her arms were too short for her to reach her vaginas so she decided to use Claire, but an orgy had just started in the classroom and a girl 25 feet tall who was six arms grabbed her. The giantess had three 12-foot sticks that were unlike any she'd ever seen since they were covered halfway up with skin like a human dick, but were shaped like horse dicks and hed knots at their bases like dogs. Jen didn't recognize the girl so she believed that she was one of the boys in the class who had transformed, even so she was so excited that she couldn't resist when she tried to put her three dicks in her pussies. The giantess went all the way in the triple penetration, holding Jen's healthy body with two pairs of hands and her breasts with the last.
She expected Claire to join them, but it didn't. As Claire she dicks the dinosaur girl Jen could feel her, with that someone was taking care of her sister and increasing her pleasure to the point that she hugged the giantess that fucked her.
The orgy in class lasted until the bell rang, at which point Jen recovered from her last orgasm while everyone left the room. When she finished recovering, she looked for Claire in the classroom but did not find her, so she realized that she could feel that someone holding her had taken her.