"I'll be glad to help if I can," Ty told his dad. "What do you want?"
Mark said, "June showed me the various body changes you made her capable of. She was a bit worried about whether I'd like them, but I do. I think they're amazing."
"I thought you'd probably like them," Ty said. "But is there a problem?"
"Not with June, or her changes," Mark said. "When June transforms, seeing her really turns me on. But it also worries me."
"Worries you?" Ty asked. "Why is that?"
"Well, even though you've already made my cock bigger, and thank you again for that, seeing June with more than one pussy makes me feel inadequate. She hasn't complained, but I worry about whether I can truly satisfy her. When we last, um, did it, she gave herself four pussies where her normal one had been, but also four breasts with pussies. And although I didn't see her this afternoon, she told me that she had twelve breast pussies and eight in her crotch. But I only have my one cock and two hands. What if that's not enough? What if she wants more?"
Ty thought about his own experiences with Lisa. He'd changed his body to match. Now that June could do a lot of the same transformations as Lisa, it seemed only fair that Mark should be able to transform to keep up. He didn't want either June or Mark to become dissatisfied.
"INo problem, Dad," Ty said. "Let's get you some transformations to match hers. I'll need you to undress."
Mark started taking off his clothing, putting it neatly on one of the chairs. "What should I do?" he asked, a bit of nervousness in his voice.
"Just stand there," said Ty. "I'll transform you in several stages, just as I did for June. First, I'll give you a second cock."
Mark watched in wonder as his hips pushed slightly further apart. His cock and scrotum split down the middle and pulled apart. Then each half grew back to full size. Mark stared at his two cocks.
"You should check them out," Ty said.
Mark was embarrassed, but reached out and held each cock with one hand. "Oh, this is great," he said. "Thank you, Ty." He let go of his cocks, and reached for his underwear, to start dressing.
Ty laughed. "June also thought she was done at that stage, with two pussies, but don't dress yet. There's more to come. I gave her the ability to undo and redo any of the transformations I'd made to her, with one limitation, and now you have that too. Change yourself back to normal."
"How do I do that?" Mark asked.
"Just think about your normal form, and about changing to it," Ty explained.
Mark watched again, as one cock and one scrotum shrank away, and his hips and crotch went back to normal. "I did that myself?" he asked.
"Yes, you did that. And you now have the ability to have as many of those as you want. You mentioned June having four pussies. Try changing yourself to have four cocks."
Mark concentrated, and changed again. It was like before, except that his crotch got even wider, and his cock spilt into four, which then grew back to full-size. "This in incredible!"
Ty said, "Now, you might need more hands to handle those. Or June's breasts, when has more than just her usual pair." Mark suddenly became a little taller, and grew a second pair of arms under the first. "You'd better try those out."
Each of Mark's four hands grabbed one his cocks, and he moaned a bit. He started masturbating, but then grew self-conscious about it and stopped. "Sorry, Ty. I'll do that on my own time."
"No apology necessary. I wasn't able to resist the first time I did that, either. As with your cocks, you should now be able to add more arms to yourself. Try adding another pair."
Mark concentrated, and two more arms appeared.
"Now I think you need just one more thing," Ty told him.
"What's that?" Mark asked.
"When June replaces her nipples with more pussies," Ty said, "I think you may want more cocks for those, too." Mark felt changes to his chest. He hadn't previously noticed that he'd gained more nipples with the extra arms, but now the nipples started growing. A lot. They became more cocks. Mark's hands grabbed his new chest cocks and started pumping, before he again became self-conscious and stopped.
"I think that should do it," Ty said, "unless you have any specific requests."
"I can't think of any other changes I'd want to myself right now," Mark said. "Thank you! Now I won't feel intimidated by how many pusssies June has."
"Great," Ty said. "So maybe you should get rid of all those cocks for now." Mark concentrated, and all his cocks and his extra arms went away, and he started reaching for his clothes again. "Um, Mark?"
Mark paused. "Yes Ty?"
"You might want to bring back _one_ cock."
Mark looked down at his crotch, and was embarrassed to see that he had none, just smooth flesh. He'd literally made _all_ of his many cocks go away. He turned red, and said, "Right, thanks!" as he grew back his original cock and scrotum. Then he quickly dressed. "Thanks for all of this, Ty!"
"You're welcome, Dad! I hope you and Mom are happy with your added... equipment. If there are any issues, just let me know."
"I'm sure this will be great," Mark said. "But if you don't mind, I do have one more request."