Adrian drove back to the lab in a slight daze. His mind kept wandering back to Sally's gray, naked body and their intimate encounter. By the time he pulled up at the building he had a raging hard-on again. He went side, filled out paperwork, and submitted the blood samples he had taken from Sally. Back at his desk he tried to type us notes, but his mind kept wandering and his erection kept straining against his pants. He found himself absentmindedly rubbing his crotch.
The next thing he knew one of his fellow lab techs was bidding him farewell for the day. Adrian couldn't believe it was after 5 o'clock. He needed to finish typing these notes, then he would go home, maybe take a cold shower. He told Sally he would sneak back in tomorrow night, but now maybe he wondered if he should try tonight?
Adrian's pants were downright uncomfortable now. Surely everyone was gone from the office? He unzipped his pants and pulled out his cock. The appendage in his hand looked unfamiliar. It was thicker and longer, and gray.
Adrian could barely ponder the implications when he heard a familiar voice behind him: "What was the shark girl like?"
Adrian froze for a moment. "Uh...really quite...remarkable..." he said.
"Must be if you forgot to go home" said the voice growing closer. It belonged to Jessica, another lab tech. Adrian and Jessica had chatted at work and casually over drinks with fellow lab techs after work. Adrian thought things had been a little flirtatious, but hadn't gone any further.
Jessica was looking at the back of Adrian's chair, but the fact that he hadn't turned around to talk to her was odd. Then she realized it looked like Adrian's hand was down his pants.
"Are you jerking off at work?"
"No, it's just..."
"Are you touching yourself while thinking about the shark girl?"
Jessica was half-serious, half-teasing. She grabbed the back of Adrian's chair and turned it so he was now facing her. He had actually been try to stuff his engorged gray member back into his pants.
"Holy shit!" exclaimed Jessica. "Is that your dick?"
"What else would it be?" Adrian defensively defensively.
"They're just not usually that color. Or that big. It's like a shark head between your legs..." Jessica realized something. "You fucked the shark girl!"
Adrian's dick twitched involuntarily. "Her name is Sally."
"So you fucked Sally the shark girl?"
A moment of silence.
"Yes, alright? I went to check her out and she came out of the pool naked. The body of a model, with a tail. I tried to keep my composure, but then she grabbed my cock and..."
"Like this?" asked Jessica, stroking Adrian's big gray penis with her hand.
Adrian shuddered with pleasure. "It's...really sensitive..."
"I hope so" said Jessica. "One look at it and I've been getting wet at the thought of having it inside me..." Adrian's shark cock got more erect in her grasp. "You want to fuck me with this too, don't you?"
"I'm so horny I'm ready to explode. But if I started to change like this from sex with Sally, you're probably going to start changing from sex with me."
Jessica's lab coat fell to the floor. "Maybe I'd like having a shark tail? Maybe then you'd be willing to sleep with me."
As Jessica bent over to untie her shoes, shaking her butt at Adrian, he imagined her with a shark tail like Sally's. The thought drove him wild. Then he realized the implications behind Jessica's words. "You mean that night at the bar..."
Jessica sighed. "I was giving you all the signals. Here's a clearer signal..."
Jessica turned back to face Adrian and dropped her pants and panties, leaving her naked except her button-up shirt. Then she climbed onto Adrian's lap, straddling him. The chair wobbled slightly, but held under their combined weight.
"This is the second time today I've risked getting fired for sex" Adrian muttered. "Worth it."
Jessica smiled then slid Adrian's big grey shark cock into her vagina. She gasped. "I've never had something this big in me!"