Jen and Claire go straight to the next class afterwards. Their next class would be Physical Education, it was scheduled that they would practice athletics and as in the current reality they did not wear clothes they went straight to the race track.
Being the first to arrive, they found Mrs. Foster waiting. The physical education teacher was a retired professional athlete who, despite her 70 years, was still in shape.
"You already arrived. This is the advantage of not wearing clothes, the others must still be changing in the locker room." Mrs. Foster said
"We could take a little longer, but we had nothing better to do." Claire said
While waiting for the other students Mrs. Foster sat down next to the sisters and said "I envy you young people. I'm old and I'm glad I can still play some races, but age has reduced my stamina a lot and I don't have enough resistance for long races anymore. Could you please pass me that bottle of water over there?"
Jen and Claire had an idea and before handing the water bottle to her, they spit out a pill inside. As soon as the teacher took the water and put the water bottle by their side, she got up and started walking towards the race track, on the way she was rejuvenating. She stopped in front of the starting line, already looking a little under 30, where she told the girls to time her in a 400m dash. The joint sisters went as requested, seeing Mrs. Foster's transformation progress with her clothes disappearing completely before the top half of her body split in two. When they got close and received the stopwatch from the physical education teacher, looking more closely at the bodies of the two women who shared the same pair of legs in time to see their shared vagina flip into a huge ballsack with 4 testicles and a pair of big dicks to grow.
Jen and Claire waited for Mrs. Foster to position herself and gave her the signal to start, with that the teacher started running. They looked at Mrs. Foster running and realized that her transformation was not over, because whle she was running her ass with her legs were still standing on the starting line. They saw that during the teacher she had become a humantaur, her taur body kept getting longer as she ran and with each step she took a new pair of legs grew and stayed in place. They could also see that she had genitals between each pair of legs, which alternated between male and female, and although they were unable to see the vaginas, they realized that the sticks varied in size and species, as not all were human. When Mrs. Foster finished the ride Jen told the running time of the teacher, who was now a humantaur with two tops and a 400 meter long taur body with so many legs that the conjoined sisters had lost count and didn't know exactly how many there were.
"It is too good to run and exercise, especially when you have 802 legs. But this race got me horny, I hope you don't mind if I masturbate a little bit." Mrs Foster said looking at the pair of hard dicks between her legs in front of her. Jen and Claire were also excited to see what the teacher did. Her long body went all the way around the athletics track and she had her ass standing right in front of her, which had a clearly wet vagina between that pair of legs, so she put one dick in that pussy and one in her ass, fucking herself.
Jen and Claire couldn't stand just watching Mrs. Foster's 'masturbation', all of their dicks got hard, so they sat on top of their teacher's ass asking for a double blowjob. The super long-time humantaur didn't deny the request, with each torso she titfucked one of their dicks kissing their mouths on their tips. The conjoined sisters moved their dicknipples so that they could fuck their own pussynipples just above.
In spite of everything, Mrs. Foster did not seem to be satisfied, which was obvious since she still had hundreds of genitals wishing to have attention as well. At this time the other students in the class left the locker room and arrived at the athletics track, where they came across the scene.
"You guys arrived at the right time, guys. You can help me a little, you can choose the genital of mine that you want and do whatever you want with it." Mrs Foster said, even though she knew that another 24 people would not be enough, but it was better than nothing. None of the students seemed to be bothered by the teacher's request, they spread themselves over her taur body choosing the dicks and pussies with which they would interact and soon joined in the orgy. The teacher then opened her mouths, placing the sisters' mouths inside hers and pushing as deep as she could in the blowjob.
In a few minutes the other students were cumming one after the other, Jen and Claire managed to hold on for a while but they were almost the last to come, narrowly losing to Mrs. Foster who came while they were having her orgasms, could if you see countless sticks shooting cum all over the athletics track until the physical education teacher finishes with her orgasm and gets ready for class.