When I walked into the Lab, it was apparent what had happened to David. The same thing that was affecting my family was somehow affecting him too. David had been short, maybe 5'3" and kind of pudgy at probably 165. He had already burned off most of the abdominal fat and had developed very pronounced hips with a tiny waist. His hair was already fuller and longer and his face had taken on a much more feminine appearance.
He was wearing sweatpants and a warm up jacket, but even though I had seem him wear the same outfit many times in the past, we often tried to get a workout in at the gym downstairs when we were busy and unable to get out, it fit him as if it was made for someone else.
It was too tight in the hips and would barely cover his expanded chest.
"Let me see, David." I said.
"No, doctor. It's not appropriate." he stammered.
"Let me see. What's going on" I asked rhetorically as I reached out and unzipped his jacket and his expanded chest fell out. He tried to cover up but I easily brushed his arms aside.as I slid his jacket off revealing a pair of nice, firm, upright c cup breasts with perfect erect nipples atop a well sculpted abdomen where there had been a loose, flabby chest and belly before.
The change was drastic and quick. It had been less than 24 hours since I had seen him and the changes were extreme. Somehow, inm noticing the changes in my assistant I forgot momentarily the changes in myself and scientific curiosity overrode the constant lust that had driven my being the better part of a day.
I felt his breasts and they were as perfect and firm as they looked. They were heavy and when I manipulated them they bounced perfectly. As I manipulated them I noticed the tell tale signs of excitement in both myself and David. He was breathing more deeply, his eyes scanned my body and he became more breathy in his speech.
"David, let me take off your pants. Have there been any changes down there?" I asked.
"Um, Doctor..." he began, but I cut him off quickly.
"David, I have to assess what is going on. If I can't see it, I can't analyze it." I said as I pulled his pants and shorts down in one fell swoop. A massive 8 inch cock with massive girth fell out of his pants. It fell to within inches of my face and it was all I could do not to take it in my lips.
"It has.....grown." he said, hesitantly.
"How big was it before?" I asked, taking it in my hand and lifting it to examine his balls as I subconsciously stroked his shaft.
"Much smaller" he began, embarrassed. "Four and a half or five inches. Not as much girth either. And my hair fell off quickly."
I got closer to it, examining it from balls to head, letting my fingers touch it intimately. I couldn't help it. My mind was completely disengaged from my thoughts. I noticed David's head fall back slightly as his eyes closed and I took the head into my mouth quickly. It barely fit in my mouth, but I worked hard to force it further. The harder I worked, the easier it seemed to go a little deeper.
When I had about three inches in my mouth, I remembered that David and I had always had a completely professional relationship/ But then, he had always been a kind of dumpy, overweight boring man who would have never held my interest but now it seemed as if I wwas interested in everyone and David had some really nice new features.
"Doctor..." he started to protest but stopped when I forced his cock as deep as I could take it.
My hands began to explore his delicious abdomen and the swell of his lats, which were also a new development. He was turning into the man of most girls dreams except for the bountiful breasts he was developing and something else I noticed. He was also developing the same skin fissure behind the base of his penis that my son had developed.
I touched it with my finger and he jumped with a start.
"Mmmmmm.." I moaned as I continued to suck his cock.
"We should see what's going on with the virus, Doctor. It has to be related." he said purposefully forcing me off his cock.
"You're right. Of course" I mumbled but still wanted to suck his gorgeous cock.
We turned on the electron microscope and while we were waiting for the equipment to warm up, I dropped to my knees in front of him again and again and he rebuffed me.
"Doctor, we have to look at the virus. It's the only explanation." he whined. I was so tired of him whining already. I liked him better as an insecure assistant. If he was going to be this sexually interesting being, why couldn't he act that way?
"You're right. But it wasn't supposed to be airborne and that is the only way it could have spread this quickly." I added, but I was barely focused on the experiment. I was focused on his cock.
"David?" I began provocatively, "did you notice any effects on other people around you?"
"N....no" he said. "I was home alone. You are the first person I called."
"Well," I said as I looked at the computer display for the microscope, "My on and my daughter both are exhibiting similar changes and their exposure was only to me and very brief. At least at first." I added remembering our session in bed.
I looked at David and again down at his erect penis and I could see that it had grown since it had been in my mouth. I eached down to stroke it while trying to focus on the display, but it was hard. I just wanted cock. David's cock precisely.
I lay my elbows on the desk and thrust mny ass out, pretending to study the display more closely, but we both knew what I was doing and David could resist no longer. He took that fat cock and thrust it into my dripping wet pussy and began fucking like a stallion in heat.
I completely forgot the display and focused entirely on the feeling between my legs. It was like a drug, causing massive amounts of serotonin to be released over and over again with each touch and each time it brought more intense pleasure that seemed to build upon the last.
Orgasm after orgasm resulted in our bodies collapsing from exhaustion.
We lay on the bare concrete floor, legs and arms entwined and gasping for breath.
"It is airborne and the changes are quick and massive." David said between gasps.
"How far will it go?" I asked as I started to rub my breasts and twerk my nipples already recovered from the exhaustion. I went to David's penis and before taking it back into my mouth, I studied it. I looked to the fissure behind his balls, which had drawn up into his body almost to the point of completely disappearing.
The fissure was now definitely a slit, beginning to look much like labia. I touched the anterior surface and when I did he convulsed, withdrawing from my touch momentarily.
"What was that?"he naked, I noticed the pitch of his voice had changed. It was a bit higher. More feminine.
"I think you are growing female genitalia" I answered clinically.
He reached down to feel the area behind his massive penis, which now curved markedly upward, and touched the forming labial folds and shuddered as he did.
My own coc, which was new to me, had obviously grown. It was nowhere as big as David's but I had had none two days ago and now my 7 inch cock was rock hard, straining to get out in the open.
I flipped David over and took my cock completely out and thrust it deeply into his developing vagina and he squealed like a virgin, which he technically was. But unlike a virgin, who deals with the pqin the first time, David immediately be thrusting back against my driving cock which was already punishing his wet pussy..
"OH MY GOD" he screamed as he began to spasm uncontrollably over and over again as I kept thrusting, new to the feeling of power assuming the male sexual position of dominance. I liked it and felt a strange sensation developing in my abdomen. My penis seemed to swell even more and suddenly I was shuddering as I spasmed and shot load after load into his awaiting vagina.
