John had started working out seriously over a year ago, and decided to take the plunge when his trainer and doctor offered to put him on a combination of growth drugs. He had been struggling with putting on mass for quite a while, and decided it was worth the risk to try some juice to get him over the hump. The drugs slowly took effect over a couple of weeks, and his muscles began to develop as never before. At the same time, John noticed that his sexual appetite was growing. His cock seemed to be getting thicker, his nips were more sensitive than ever, and during sex he'd totally loose control. He scared one fb, as he kept on fucking him through several orgasms and left the poor guy a quivering, sweaty heap on the floor. John would occasionally wake up with blue balls so bad, and a dick dripping precum so liberally that he had no choice but to jack off two or three times just so he could get back to sleep.
During this time John started to see Bill, a guy from out of town. John and Bill had started chatting online, and over the course of a few months had hit it off, and Bill started to take the train into the city to visit John. They had some great sex, and Bill really got inot how John would totally loose control during sex. John was having a great time, but really wanted to see Bill as sexually taken over as he was. On several occasions Bill seemed to disapprove of any performance enhancement, but one night after a particularly sweaty session John decided Bill needed to experience the drugs first hand. John knew it would take several weeks for the drugs to work their way on his body, but since Bill had been coming out each weekend for a while John figured this was his chance.
Bill was laying naked in bed next to John, face down and sound asleep. John reached over and got a syringe out of the nightstand, and filled it with the drugs. John moved over to Bill's naked ass, and gently spread apart the firm, furry muscles apart, exposing Bill's pink hole, perineum and swollen scrotum. John took aim with the needle halfway between Bill's hole and sack, and shot the drugs deep into Bill's body. Bill groaned and started to move as if he was waking up, but John quickly started to rim the naked man, moving on to Bill's cock and another draining orgasm for Bill. Bill fell back asleep, completely unaware that powerful drugs were starting to change his body.
John and Bill continued their relationship, and over the next four weekends John would repeat the same procedure. Bill really liked how John was now giving him midnight blowjobs, but had no idea that his increasing horniness and surprising gains at the gym had anything to do with his trips to visit John. John also noticed the changes in Bill's body -- Bill was much beefier, and where before Bill didn't precum, now John would routinely find wet trails on the bed from Bill's leaking cock.
On the fifth weekend John had proceeded as he had before. Bill had gotten into town late, they had a good dinner together, and then enjoyed some rough sex before Bill passed out from the sex and the long trip after a longer day at work. John spread Bill's ass wide apart, and stuck the needle deep up into Bill's body. But unlike the previous times, almost instantly Bill started to moan. Bill's ass visibly twitched, his legs spread wide apart, and his back arched up. John finished the injection, but not before Bill's body had started to squirm. As John withdrew the needle, Bill's reaction increased. His testicles rose up to his body, his pink hole started twitching, and sweat broke out all over Bill's muscular form. Bill flipped over onto his back, which now was arching so intensely that Bill's head was forced back into the pillows. Bill's moaning turned to yelling, and Bills hands had involuntarily found his nipples and were starting to twist them. Just as he twisted his nips, Bill screamed as his body convulsed and thick white streams of cum exploded from his rock hard cock and hit the headboard, with some of the spray splattering on his flexing body.
Bill's orgasm subsided, but his physical state did not. Bill's legs opened up again, and John could see that his hole was still pulsing. Bill was moaning, but now was begging John to fuck him and fuck him hard. Having watched Bill have what must have been one of the most intense orgasms of his life, John was now rock hard and ready to go. He quickly threw Bill's legs over his shoulders, and slid deep into him.
Bill and John were both surprised when Johns cock hit Bill's prostate -- Bill screamed with pleasure as his body had another huge spasm, and a load of cum went spraying out of Bills throbbing penis. Usually that kind of orgasm would make Bill want John to pull out, but tonight Bill only wanted John deeper inside of him. Bill wrapped his legs around John and flexed; both pulling John into Bill and igniting the sexual fire of the juice in John. As Bill felt John's pubes grind against Bill's pink hole, John lost control and began thrusting like a wild animal.
Bill was only vaguely aware of the changes coming over John's body -- he could feel his partner's body getting warmer and sweatier, but was more and more focused on the sensations spreading over his body from the earlier injection. He seemed to be nothing more than a sex machine; his entire body seemed to be controlled by his ass and cock. Likewise John had trouble noticing Bill, except as an exceptionally strong ass that seemed intent on milking John's cock for all it was worth. After only a few minutes, John erupted deep inside Bill, which in turn triggered another orgasm in the spasming bottom.
John flipped Bill onto his stomach, and proceeded to rut him harder than ever before. Bill was being forced across the bed by the violent pounding, and his leaking cock was dragging along the coarse fabric of the bed, leaving a trail of precum as the two men's bodies worked their way across the bed. Finally Bill reached the edge, and used the bed frame to finally buck back against John's thrusts. The change in sensation was enough to send John over the edge again, but this wasn't enough for John. John flipped Bill around again, got Bill's legs over his shoulders again, and resumed thrusting. John reached down and started giving Bill deep probing kisses, as the two mens abdominals ground together, jacking off Bill's cock. This position didn't last for long, as the friction quickly sent both men over the edge, and they collapsed in a sweating heap of cum, sweat and muscle.
John rolled over and dozed off, leaving Bill to do the same. John woke up to Bill's moaning, and watched in amazement as Bill worked himself up to another intense orgasm while still being asleep. John loved the silhouette of Bill's cock, standing straight up above his heaving body, and smiled as he saw jets of cum erupt from the tip.
The next morning Bill had trouble getting out of bed -- the orgasms and pounding had left him sore, and he gratefully accepted some aspirin from John. Bill slowly recovered, and confessed to John that he had realized after the second weekend that he was getting injections from John, but liked the effects they had on him. The two finally managed to get out of bed, and enjoyed a breakfast. They both drank about half a gallon of milk, which seemed to go straight to their balls. By the time they had showered, John's cock was once again hard and spreading Bill wide open...