Eric slowly stirred awake, looking over to his alarm clock he noticed he had been napping for a little over an hour. He looked next to him at Linny and started, something wasn't right with her. She looked less feminine, her curves weren't as noticeable, and something was between her legs. Eric took a closer look and noticed a small penis where he vagina had been.
Eric quickly got off the bed, and stood transfixed as he watched her. The penis grew before his eyes, until a six inch flaccid cock laid against her legs, her blonde pubic bush becoming thicker. She rolled onto her back, her legs spreading slightly as a scrotum formed and filled with two lemon sized testicles. Her breasts began to pull back into her chest as her hips narrowed, her pelvis becoming distinctly more male. Her whole body began to stretch until she was nearly the height of Eric.
Muscle began to fill out her form, her already taught stomach hardened into a well defined six pack, and her chest once again swelled, but now with firm pecs. Her broadening shoulders filled out with muscle. Her arms and legs swelled with lean athletic muscle.
Eric looked to her face, her nose began to broaden and her jaw became more square, her lips less full. Now anyone looking at her would then she was Linny's brother, not Linny herself. Blond hairs grew down her legs and arms, and a thick patch pushed out from her pits. A light dusting grew on her chest and a treasure trail linked it to her pubic bush. Finally a few days of blondish stubble grew on her jaw, she looked completely a man now.
Eric reached out tentatively to her shoulder, shaking her gently awake. "Linny, Linny! Wake up, we have a problem!" Her eyes fluttered open and looked at him, he was relieved to see they were still the same emerald green. "Linny, I think the serum got into you." She sat bolt upright and looked at herself, she looked between Eric and her own body, opened her mouth as if too scream and passed out.
Eric quickly ran to the phone, pulling out the ad for the study, finding the number he quickly dialed. "Hello, this is Eric! I was in earlier, I need to speak to the doctor, there's a problem." He was put on hold, but soon the accented voice came over the line.
"Hello, Eric, so, are you enjoying your new body?"
"No.. well, yes. But there's a problem. My girlfriend..."
"You slept with her?"
"Yes, and.."
"She changed into a man, much like yourself?"
"Yes, but..."
"Didn't you read the warning in the paperwork you signed, not to engage in intercourse for a week after the injection as the serum remained in your bodily fluids?"
Eric mentally kicked himself. Why would he read those? No one read those.. "No, I must have missed that, is there anything you can do?"
"Not really, the change is permanent."
"What about another injection?"
"Inadvisable, we have not had proper research time, and the tests on being injected with two serums have all been.. inconclusive."
"What do you mean inconclusive?"
"Well, either nothing happened, something unexpected happened, the new serum over rode the old, or the patient died. As I said we haven't had proper research time. But if you two would like to come by, I can see what I can do."
"Alright, I'll talk to her. Goodbye." Eric hung up the phone without waiting for the doctor's reply. He looked over to Linny, she was sitting up and looking at him.
"I heard it all." Her deep voice was still soft. "What are we going to do?"