"That felt absolutely amazing," Lisa said, "but I still want an even more extreme transformation."
Once again, Ty was agog. "What could possibly be more extreme than you actually _being_ my cum?"
"I want to go back to being your cock," she said. "Like before, when you split it in two, and split me in two in the process, and later merged me back."
"Since we already have done that, while it still seems pretty extreme to me, I don't see how it's 'even more extreme'. But I enjoyed it, so sure."
He was about to do that again, but she interrupted. "But this time, when you split your cock in two, DON'T split me in two. I want just the one me to be both of your cocks simultaneously. In fact, I want you to split them again, into four, so you'd better give yourself more arms, too."
"OK," Ty said. "I guess that really _is_ more extreme. Anything else?"
"That's it for now. Let's do it!"
Ty transformed Lisa into his cock, and increased the size of the cock considerably. He stroked it, thinking about how it must feel to her, I've got to try this myself, soon, he thought. He split the cock in two smaller ones, side-by-side, being sure _not_ to split Lisa, and grew the cocks in size again. Now I'm _really_ curious how she feels, he thought, as he stroked both cocks. He gave himself two more arms, then split the cocks again, now having a second pair side-by-side above the first pair, and grew them again. He grabbed each of his four cocks with a hand, and stroked them, starting slowly, and gradually picking up the pace.
It took all of his willpower to not come too quiickly. He assumed that Lisa would prefer that he stretch it out as long as he could. Nevertheless, it was only a few minutes before he came, his four cocks (Lisa!) shooting huge amounts of cum all over. He continued to gently stroke himself for a while, but he was eager to find out how it had been for Lisa, so he soon transformed her back to her normal human form.
"Well, what did you think?" he asked.
"I thought being one cock was amazing, but being four was insane! I want more!"
"More?" Ty asked. "At some point it's going to be difficult for me to keep adding on more cocks and arms."
"I have an idea about that," Lisa told him.