Danny asked his twin to sit on the bed and wait a few minutes.
Typing like a madman. Clicking on options. It seemed like an eternity when he turned around and said are you ready?
Jeff gulped audibly and said yes.
Danny turned around and hit submit and almost immediately Danny began to change. In moments he grew to 6' tall. Not a great spurt but enough that it was noticeable. His waist began to tighten as his shoulders spread. His waist became 32 inches. And his chest was almost instantly 80 inches. His biceps became 40 inch logs and his legs spread out massively. His abdomen could not be described as a six pack. There were so many ripples there that it was more like a washboard. His jaw line became more angular with a nice permanent 5 o'clock shadow. His hair shortened with a little flip of a wisp in the front reminiscent of the flip Clark Kent had in the comic books. But the most dramatic change was his formerly diminutive penis began to grow and grow. Resting on the floor as he sat at the desk. His balls filled with cum looking like two soccer balls and with his legs spread wide with the muscle growth there was room for them to hang.
It was almost comical when he finally changed and the first thing he said to Jeff was what do you think. But his body wasn't what was comical. He now had a high pitched voice almost like that of a castrated boy singing in the choir.
This set Jeff on a laugh that he didn't notice what happened next. Danny stood up and was on Jeff quicker than he noticed. He picked Jeff up like a rag doll turned him on his now plush belly and thrust his three foot long soft cock deep into Jeff's virgin hole. As he thrust he got longer and thicker and harder. Jeff's eyes rolled back in his head as Danny came and filled Jeff with his seed.
Exhausted Jeff didn't notice that Danny sat down at the desk once more and typed in some more changes for Jeff. As he slept Danny hit submit and once the changes occurred he brought down a sledge hammer of a fist on the Chronivac and made sure that their changes were there for good.