Worried that pulling on the thread might cause some damage somehow, Zack wiped himself and tucked his penis away, along with the thread. He couldn't think how it got there. Was this some kind of practical joke? The result of some kind of surgery? Maybe someone had inserted a probe, either to investigate his insides or use him as a spy. All of this was a problem, and he didn't want to risk his job to find out.
So Zack tried to ignore the problem and get through work. But the thread kept getting on his mind. And he swore it was itching. Every time he put his hands on his pants to itch it he had to stop himself, out of fear of making it worse.
He stayed in his office all day, writing reports and reading emails. Phone calls to his secretary took care of everything except a couple meetings. Zack sweated through all of them, worried that somehow they knew about the thread in his dick. As if they could see his crotch through his pants and hardwood desk. He'd never been this paranoid before, but then, he never found a thread in his dick before.
Finally, it was time to come home, and nothing had come of it. His dick felt fine, but he was afraid to pull on it through his pants or his pockets. Carefully, he stood up, trying to arrange his dick so it was hanging naturally, then walked to the door, practicing to see how he could walk bowlegged without anybody noticing.