The boy was naked and breathed heavily. The lights were blinding with very intensive white color, but as far as he could see, he was alone in the empty room. He have been struggling for a while against the restraints, but soon he found out it was a useless fight. He was strapped tightly to the structure behind him and his mouth was stuffed with his own underpants with the black tape entering between his teeth. This way, it was completely understandable how quickly he got exhausted.

...

A woman, probably middle-aged, dressed in long white medical clothing entered the laboratory. Her high heels were producing an annoying tapping sound. The name-tag hanging on her chest stated "Linda Johnson - genetic scientist". She quickly crossed the laboratory getting closer to her new victim - a man who was strapped to the wall near her equipment about an hour ago.

Dr Johnson looked at him. He was skinny, almost no beard and clean shaven pubic hair. It was difficulty to say how old he was - probably 19-20 or even 21, but it was clear that he was very young, almost a boy. His body was elevated from the floor, so it was very easy for her to take his cock in her hand. His member was seemed not very big in its soft state and but at least it was circumcised which was to maker her work a bit easier. Dr Linda Johnson started massaging his cock gently. The young man was mumbling something from behind his taped and gagged mouth, but at the end he got an erection. Once the erection was full she measured 5 inches of length, which confirmed her concerns. Now she was sure she had to start with double dosage of what she had planned.

The young man seemed a bit tensed when she continued playing with his dick, this time with a glass measuring cup in her other hand. He watched helplessly as she wanked his dick off. It seemed so inappropriate to him, but seeing her red manicured fingers playing with his not very big but very hard and erect cock was obviously more than enough for him to maintain his erection. After another minute or two, Dr. Johnson milked carefully all of his sperm in the cup.

"It's for my genetic sequencer" she explained to which the boy just mumbled something with his gagged mouth. That meant nothing for him as he was still oblivious of what was coming next. He watched in horror as she went to her equipment, unloaded his freshly milked sperm in a special container and started writing in her diary.

...

28th of June

14:00 Entry 1

The genetic material of the subject is loaded into the sequencer. The serum is expected to be ready in less then 15 minutes.

14:17 Entry 2

The first dose of the serum has been injected. The subject had started sweating profusely. No other obvious changes noted.

14:33 Entry 3

The second dose of the serum has been injected. The first signs of the started mutation are already visible. The subject's erection, as expected, is now constant and his cock had become slightly red in color

15:32 Entry 4

During the last one hour the subject has been injected with his third and fourth dose. The next dose and check will be around 17:30

...

Dr Linda Johnson injected him with yet another dose of whatever she had created and left the room. He was once again alone in the laboratory. During the next two hours he couldn't do anything different but trying to fight the burning sensation in his body. Since after the first injection he was sweating profusely. Unbeknownst to him, very strange processes were happening in his body. There was no escape. The only thing he could do was to wait there calmly in his restraints and to try to endure whatever was about to happen.

...

17:35 Entry 5

The fifth dose had been administered. A few changes had become more noticable. As expected his cock had started to grow. The tape measure confirmed my prognosis. After the first three hours of treatment the length has increased by 30%. The girth of the member had also increased by around 10%.

18:15 Entry 6

Shortly before injecting the sixth dose of the serum I can report that the growth in size of his member continues, although it is less quickly. The first signs of the constant sperm secretion are no noticeable.

23:15 Entry 7

Another two doses had been administered. With only two other doses remaining to be injected in the subject, I can safely say that the experiment is a great success. Since entry 5 his cock had increased length with the impressive 63%. The girth was also noticeably improved. Measures taken - 10, 6 inches in length and 2, 1 inches in diameter. Whatsmore, in his current condition ejaculation was already not possible. The genetic serum is doing its job perfectly. His enormous cock has a strong and steady erection pointing to the ceiling. The production of sperm has also increased numerous times and his genetic material is leaking constantly with an uncontrollable small stream down his cock.

30th of June

09:30 Entry 8

During the night the last two doses had been administered. The growth of his cock had reached its limit. The last measure I took was 13 inches in length and 2, 6 inches in diameter. The erection was still ongoing, but now it seems his cock is to heavy and it's pointing only slightly upward. Leaving that behind, everything is perfect with more than 10 liters of his own sperm drained in the container underneath him. His genetically changed cock was still pouring additional quantity of the sperm material, so by tomorrow we will have at least 25 liters. This is enough for the future research and experiments.

...

30th of June

11:30 Entry 9

This morning the last part of the experiment was planned to be carried out.

This is the first time since the start of the modification when I am actually having the first genetically enhanced cock in my hands. It's heavy, very heavy. Despite the continuous stream of semen from the subject's newly genetically modified cock we had to proceed. That factor made things more difficult and definitely more messier then it was necessary but anyway we started the procedure.

One of my assistants joked that we had to consider using a spiked rod, but that was against our code. Despite not inserting a spiked tube in his penis, the subject was not too happy from the procedure. I don't know why he was acting so scared in his restraints. The idea of the rod was simple - it was part of sperm gathering device. Soon the hollow rod was fully inside the 13 inch long penis with only the tip of it (1 inch) remaining out. This tip was threaded as it served for the installation of the other parts.

Initially the his sperm was only partially going through the hollow rod, but this was soon fixed when the metal encasing around the cock and the tightening clamps were installed. The final part of the assembly was the large knob around the head of the cock which was after that connected to the external tube system.

With that the team is ready to for the next test, which was injecting the sperm into our next subjects. The initial results seems very promising so I am sure that our subjects will apreciate the special effects the genetically modified sperm has on them. Till then our first subject Mx01 will remain our main donor.

...

Once Dr. Linda Johnson stopped writing in her diary, she left the room turning off the lights. The young man was left alone in the laboratory with his new cock pulsating and throbbing in its metal prison, pumping enormous quantities of cum in the tank of the machinery behind him. Every now and then a drop of his own semen was leaking from underneath the metal encasing of his cock rather falling in the container beneath him or simply drying off on his balls.