Jen watched Laura as closely as possible form her position. The transformation was quick, like last time. First, Laura's chair disappeared as her legs were replaced with eight mechanical legs, thin like those of a spider. Up on her chest, the previously flat Laura grew a couple of relatively large breasts that her top no longer covered. However, a metal beverage tap now replaced the nipple of each, allowing her to dispense whatever liquid was inside at any rate she desired. One of her arms was also replaced by a cyborg one, with a mechanical claw that could morph into a number of gadgets. Her final transformation was the most eye-catching, however: She now had a ponytail on each side of her head, and they began to spin. With the tap of a button on her neck, Laura's head detached from her body, and used her ponytails like drone propellers to keep her airborne. She picked up the empty can in her mouth, and flew it over to the recycling bin in the front of the class, before returning. Just to finish things off, Jen was fairly sure she could see an electric power cord coming out of Laura's back, plugged into the outlet next to her on the wall to recharge.
Jen would have focused more, but she saw a strange wave go over about half the other students... The boys (and a couple of girls) who had been fucking (or giving cunnilingus to) Audrey. As expected, the transformation had spread through Audrey's fluids.
Several boys merged into one body with multiple heads. Another boy turned into a girl with five breasts, but kept his penis. Several other boys grew extra penises that snaked their way over to Audrey just like their original. The lesbian's tongue turned into a penis, while the bisexual girl merged with the boy who had become a girl, also growing five breasts and retracting her tongue since their shared penis now covered its duty.
Then it was Jen's turn. She braced herself for what was coming.