Biology class with Claire's original body was unexciting for most of it, the sister were having a hard time finding an opportunity to slip someone a pill. The class itself was going well, though once the other girls body started having sex with Mrs. Jolie they began to have trouble focusing with this body. The last straw was when Lara joined in the sensation from Jen's body body causing Claire's body's cocks to harden. When Mrs Tompson notices she began to scowl, causing the two sisters to worry that they were in trouble.
“Looks like Jen and Claire are hard again, can someone help me get them off so they can focus in the lesson again?”
The teachers request was answered by Izzy, a fashionista who always wore expensive looking clothes and gaudy jewellery. Once Izzy had joined the teacher in front of the sisters the two of them kneeled down in front of Jen and Claire and began sucking on their cocks. Since the sisters cocks were where their mouths were on this body it was a simple matter for them to each spit out a pill into Izzy and Mrs. Tompson's mouths. As the two of them continued to suck the sisters cocks the pills effects began to manifest.
Mrs. Tompson began to grow shorter, her body shrinking to the point where she need to stand up to continue being able to reach the cock she was sucking. Once she had reached a puny height of two feet her face pushed out into a reptilian muzzle, red-brown scales coating her face. Her hair receded into her head, replaced with a spike crest of scales and a pair of short, forward swept, horns. The scales rapidly coated her body, transforming her hands and feet into reptilian claws and talons. A scaly tail pressed out of her behind and began whipping back and forth. Her tits and ass then began to grow, filling out her still normal sized clothes, reaching the point where her top barely covered the tops of her nipples and her pants covered as much as a pair booty shorts. Her pants were strained even further as a bulge appeared in her crotch, rapidly growing larger and larger. Just before her pants reached the breaking point, a hole appeared and let her massive cock and balls hang out in the open.
Meanwhile Izzy's legs had fused together, their combined mass flattening into a rectangle of flesh. The edges of the rectangle then stretched upwards until four walls surrounded her body up to just below her bust-line. The box of flesh surrounding her then began to harden, taking on a dark brown colour and the texture of wood grain. A half-cylinder lid then grew out behind the box, attached by a trio of hinges. Leather bindings then covered all of the edges of the chest, and a latch with a padlock appeared on the front. The inside of the chest took on a fleshy pink colour and pointed teeth lined the top of the chest and the bottom of the lid. Izzy's breasts then grew to J-cups and her nipples turned into vaginas, replacing the one she lost when her legs turned into her treasure chest.
As Mrs. Tompson and Izzy's transformations finished Jen and Claire came, shooting their loads into the two's stomachs and their dick-nipples coated their backs with jizz. Now that the sisters were no longer burning with lust, Mrs. Tompson, now a short-stack herm kobold, moved back to the front of the class while Izzy, now a mimic-girl, hopped her chest back over to her desk and skilfully climbed back into her seat. To accommodate Mrs. Tompson's tiny body, her desk was now atop a platform that also allowed her access to the whiteboard. Despite her massive assets, any one of which was now several times larger than the rest of her body, the teacher had no trouble moving about, her thick ass and gargantuan tits jiggling with each motion and her three foot long cock and beach-ball sized balls dragging along the floor as she moved.
Both of Jen and Claire's classed ended without any other opportunities to transform people presenting themselves. Once the bell rang the girls left their classes and then...