He knew that right after eating the fruit there had been a strange sensation in his crotch, intense enough to cause him to get an erection, but there was something wrong with the way it felt. He couldn't quite figure it out, but it was very different from the way things normally felt, maybe more intense than normal, or maybe something else. Unzipping his pants freed his erections.
Erections. Plural.
He had grown a second cock, right next to his original, though he couldn't tell which was the first and which one didn't belong. They were perfect mirror images of each other, right down to the slight curve they possessed and the veins that ran down their lengths. Not wanting to believe what he saw he touched them and determined that they were both very real. Afraid of what else he might find, he examined his balls and let out a sigh of relief when they turned out to be unchanged.
One erection he would have been able to ignore and hide before going back to his friends, but it he didn't think he'd be able to stuff two of them back into his pants. With nothing else to do he took one in each hand and began to masturbate.
The sensations and pleasure was doubled by his having two cocks. His whole world dwindled down to the twin blissful aches at his crotch. He wasn't used to giving hands such a workout, since he'd always been able to use both together before, and realized that he wasn't quite able to get to the point he needed to be at. Never before in his life had he needed to cum so badly. Rubbing harder wasn't helping since his right hand, the one he used less in such activities, was starting to get tired. To solve this problem he tried to put his cocks together to use both hands on each at the same time.
At first the feeling of the two cocks smashed together and throbbing against each other repulsed him, but the pleasure only intensified with each throb, bringing him ever closer to the orgasm he craved.
The rush of blood pounding through his cocks seemed to intensify, driving him to his knees as they tensed before he shot twin streams of cum across the room.
Afterward he realized that though the simultaneous orgasms had been as intense as any he'd had with one cock, the resulting spurts of cum were half of what he was used to. It was the obvious result of having twice the cocks with only the standard number of balls, not that he'd want another set of balls. Having two cocks was bad enough.
Realizing that the fruit had done this to him he pondered what he would do.