Christy watched Ella's twin daughters asleep when the nurse said "Thank you for helping me here, it is not easy to work in childbirth when babies are born teenagers. Now I'm going to need to do some tests on them to make sure they are healthy. Could I ask you to do me a favor?"
"I think I can. What do you want me to do?" Christy said
"There is a student at the school who has not been coming recently due to some problems. If I am not mistaken you are her friend, then maybe you can go see how she is today for me." the nurse said
Christy tried to guess who her friend was, Madison remembered first and said "Is Kelsey you talking about? Now that I think about it, I haven't seen her since that group activity in the locker room."
"It's herself. You already know where she lives, don't you?" the nurse said
"I've been to her house before, we will have no problem going there." Madison said
Chisty said goodbye to Ella and Tiff and left. It was the first time she had left school at school with permission. She ran as fast as she could with her horse body and arrived at Kelsey's in less than 10 minutes. She rang the bell, but no one answered. After getting tired of ringing the bell she went down to go around and try to get in the back of the house, but as soon as she came around she couldn't believe what she saw.
"Hi guys, it's good to see you here." said Kelsey, who was sitting on her balls.
Christy remembered that he had left her with huge balls, but not so big. Certainly her balls were at least 20 feet in diameter, making Kelsey unable to put her feet on the ground and sit on them all the time.
"What happened to you Kelsey? How did your balls get so big?" Christy asked
"It looks like it happened because of the size of my dick. As you know, the amount of cum I can ejaculate is too small for the size of my balls and the pace at which I produce cum, which ended up stretching my testicles. The bigger it got, the faster it started fucking and only accelerated its growth." Kelsey said
At this time Christy realized that Kelsey was jerking off, because she came. Even though her orgasm lasted a few minutes, the amount of cum that came out was certainly very small close to what was supposed to be inside her balls.
"As you can see my balls are now too big even for me to enter my house and I can't come enough. If I had a dick like Madison it would be so much better." Kelsey said
Christy then had an idea, took the transformation gun and shot Madison under it. Then she pulled Madison, who broke free leaving her balls behind. She then threw what was only Madison's upper half to Kelsey saying "Take her and put her on your dick."
Kelsey did as Christy said and immediately their bodies merged and Madison became her dick.
Then Christy shot herself with the transformation gun, her balls shrunk until they disappear and leave a horse pussy between her back legs, then her whole body grew so that she was almost three times bigger than before, becoming a giant centauress.
Christy then turned her back on Kelsey, who got a message and with Madison's help she pulled Christy's tail hard, which made her go a little forward, enough for Madison to be placed inside the giantess pussy before them.
They moved as they could until Kelsey announced that she was going to come again. Quickly she held on as she could, with Madison in her Christy pussy, and she came. The amount that passed through Madison came out of her mouth was much larger than the tiny dick that Kelsey had before, which resulted in her enjoying more.
As Kelsey came, her balls were shrinking. When it was over, they were already the same 2 feet in diameter that Christy had given her at the beginning.
When the orgasm ended Kelsey lay on the floor exhausted. Christy was surprised, because despite being much larger than before, the amount of cum was almost too much for her and her horse belly was so full that it almost touched the ground.