The sisters other body meanwhile, had math class with Mrs. Watson. When Jen and Claire thought about their invisible teacher they had an idea. Just outside to classroom the girls pulled a small bottle out of their bag and filled it with a dozen or so pills. When they entered the classroom, empty except their teacher, the only thing visible about her being her clothes. Jen and Claire then approach Mrs. Watson, praying that the woman is willing to go along with their plan.
“Mrs. Watson, we were wondering if you might be willing to do something for us?”
“That depends on what it is, though if your asking for sex, It would have to be after class.
“No, its not that, we were wondering if you might be willing to slip some of our classmates these pills while invisible, they're some aphrodisiacs and we think they will make class a bit more interesting.” As Claire said this they awkwardly held out to pill bottle with their dick-arm.
“Girls, I'm a professional teacher I wouldn't be so irresponsible that i would give some mysterious pills to my students, no matter how much I trust the person giving them to me.” While Mrs. Watson said this however, she took the pill bottle from the girls and pressed a little closer to them, letting them feel her raging erection as she whispered in their ear.
“I'll see what I can do”
Jen and Claire then took their seats as the rest of the class arrived. Throughout the first half of the class they found it hard to focus due to their other body having sex with Mrs. Foster. Just as their arousal reached the point where their dick-arms were no longer able to take notes, Mrs. Watson addressed the class.
“Alright class, Open your textbook and do the problems on pages eighty and eighty-one. I'm going to head down to the supply room and get some more chalk, behave yourself while I'm gone.”
As soon as the teacher left, the students began talking among themselves. A minute or so later, Jen and Claire saw a couple of the pills they had given to Mrs. Watson come floating into the room through the door. The pills, carried by the now naked invisible teacher, made their way to the back of the class and one dropped into the mouth of Lucus, a goth who seemed to be constantly tired, who had fallen asleep in his seat during the lesson.
Lucius shrank down, his clothes vanishing before they got too small for him. As he shrank, his body feminized, turning Lucus into a petite, flat girl. The only exceptions to both of Lucus's changes was her cock and balls, reaming the same size despite her shrinking body. Her shrinking stopped once she was only eight inches tall, making her just as tall as her cock was long. The diminutive girl, now sitting on her balls as she slept, then grew a pair of butterfly wings from her back with a wingspan larger than her bodies height. Lucus's final change was that her ears became pointed, making it unmistakable that she was now a fairy.
Mrs. Watson left the fairy, who had begun to rub her cock in her sleep, behind she then moved on to the next student, unaware of Lucus's transformation. The next victim was Gina, a nerdy girl who tended to not pay attention to lessons due to already understanding the material, who had pulled out a bag of candy when the teacher left and was eating it in handfuls. Mrs. Watson dropped her other pill into the back just before Gina grabbed her next scoop, eating the pill alongside the rest of the candies.
Gina's legs lost their shape, before moulding themselves into two fish-like tails. The tails were then covered in blue fish scales as both tails thickened slightly. Her ears then transformed into a pair of fin-like ears and her hair lengthened down to the floor, becoming the same shade of blue as her scales. Her breasts ballooned out to the size of beach balls, and her nipples lengthened and split, each one becoming a pair of ten-inch dick-nipples. Each breasts then grew a melon-sized scrotum with four balls in it each, finishing her changes.
After her changes finished, Gina walked over to a group of four girls chatting and asked them to suck her cocks, which they happily agreed to. Meanwhile Mrs. Watson made her way back over to Jen and Claire, planning on helping the girls with their now completely erect cock-limbs. Jen and Claire felt their teacher sit on their lap as she leaned in and whispered in their ears.
“I made sure to take one of your pills before handing them out, just to make sure they really were just an aphrodisiac like you said and I have to say, they were even stronger than I thought.”
As she said this the sisters felt her shove her cock between their breasts, now clearly much larger than it was before as they could feel it all the way between their heads. They began to suck and lick on the cock between them as Mrs. Watson started stroking their cock-arms.
“You two really are some of the best at pleasuring my horsecock, besides my husband that is. It's such a shame that their are so few people who can take all six feet of it.”
The three of them pleasured each other for a couple more minutes before they climaxed, Jen shooting cum from all four of her cock limbs, and Mrs. Watson blasting her invisible jizz across the classroom, several student confused as to why they were suddenly covered in liquid.
Mrs. Watson then left the room and came back in with her clothes on, allowing the students to see her, and continued on with class normally until the bell rang. Jen and Claire went to the bathroom and washed themselves off before they headed to their final class before lunch, their other body doing the same.