Mark went to put on some clothes (short and sexy) and go out, but then he remembered a dream from long ago where his dick's tip had split into three separate ends. He remembered the dream, which he'd had as a young teenager (≈13 or 14), and the complete euphoria that the dream had given him, and wanted to see what it would be like in real life.
Mark looked down at Aidan. His cock. That fact still pleased him, and aroused him enough to start making Aidan swell up. "Aidan, split into one cock with three ends, kind of like a trident, or a hydra."
"What?" Aidan asked, alarmed. Immediately, the end of Mark's cock, the end with Aidan's head, began to triple in width, and his cock also grew in length vastly. After a few seconds, it split into three ends, with each becoming an identical head. His dick's overall length was now about a foot long not including the heads and about four inches wide, with each head adding another seven inches of length and being about one and a half inches wide. "Why did you do this?" the left head asked. Mark wondered if they had a connected consciousness.
"Go back to…well, not normal, but the new normal," Mark said. Each Aidan head saw their vision become covered up and swallowed as their arms disappeared and a foreskin grew over them. From Mark's perspective, it looked a bit like the faces faded and were swallowed by a hood. His dick now had three ends.
Mark went to the Chronivac and edited it so that all men had trident-dicks like him, and that all women had three vaginas so that they could accept a trident-dick. He also edited the world so that everyone thought that they'd always been like that, and that men could tell their cocks to become cock-men or not at will. He edited the culture of the world to get rid of men's pants so that they didn't have to struggle to hide their cocks or anything.
Mark then looked down at his cock. He was feeling rather aroused. "Turn into Aidan," he commanded. It immediately revealed the three faces. They were actually looking a lot like him now—it was still Aidan personality-wise, but the actual physicalities of it were Mark-esque.
Mark didn't even have to command Aidan to become erect—he was already erect and pulsing. He grabbed his now extra-long dick with both hands and pumped up and down, working himself up. He held it back for as long as he could, enjoying the building suspense, before finally releasing. A huge explosion of Italian cum burst out of all three mouths of Aidan and dribbled down his faces and chins. It went everywhere, all over the room. Mark grinned in ecstasy—he'd never felt so powerful with an ejaculation before.
Mark was ecstatic. "Oh, this is going to be a fun world."