Chad got in the car, he was feeling weird. Maybe the food had been bad? He felt bloated, but not just his stomach, he felt bloated all over.
Lili offered to drive, that was a relief. Chad could just sit on the front seat and be miserable.
He sat there unmoving while Lili put on her pop playlist on the radio to fill in the silence. Chad never liked pop music, but he wasn't feeling like talking and the music made it less awkward.
The bloating was getting worse, Chad tried to find a position that could alleviate it but failed, he felt sore all over. He crossed his arms over his stomach and groaned in discomfort. He started running his hands along his arms and that seemed to soothe him a little.
Each time his hands rubbed against his biceps he felt more relief, but at the same time, each time his hands went by his arms felt increasingly more like they were going to burst. He was moving his hands faster now, and over time both feelings, the discomfort and the relief, seemed to mix together into a pleasurable pressure. His groans soon turned into stifled moans as he groped his own arms, the pleasure was going up in a crescendo, his dick was throbbing, hard, in his pants and then...
Something seemed to burst. Sudden release took over him as he felt his biceps expand suddenly. Realizing what he was just doing he looked at Lili, that seemed to not have been paying attention to him as she hummed along the new Lady Gaga album. He then looked down to his arms and sure, they looked bigger and also... hairier? His forearms and hands both seemed wider and had dark hairs all over them, his own body hair being blonde-
Arriving home broke him out of his reflections. Lili look over at him and asked how he was feeling. In lieu of what had just happened we had stopped paying attention, but now that she asked: he was feeling as bad as ever, the pressure in his arms had went down, but seemed to slowly be building up again.
As they entered the house he quickly excused himself to the bathroom. He locked the door and immediately took of his T-shirt to look himself on the mirror. And there it was, his arms were definitely bigger. He flexed a double biceps pose and immediately regretted it, the pressure seemed to increase tenfold in his arms.
He started rubbing himself again, this time it seemed to take less time for the pleasure to start building up. Soon he had stripped and was sitting down on the toiled rubbing his whole body. His dick was throbbing hard but rubbing the rest of his body felt better. Soon the building pleasure in his arms gave way to that expanding feeling again, and he felt his arms get bigger. His hands moved to his pecs now and as he kneaded them he could feel the hair getting thicker. He had been trying to be quiet and hold his moans, but that only made them sound like whimpers.
As his hands went over his nipples he shuddered. His nipples had never been too sensitive but right now they felt on fire. As he started tugging on them he felt them expand slowly as he felt his pecs expand outwards in short bursts. His ass felt amazing against the toilet lid and he started to gyrate it. Every part of his body that could be rubbed against something was being rubbed against something as the pleasure fired off in shorter and shorter bursts, and he expanded.
As they expanded his arms and pecs started feeling softer and softer, as a layer of fat formed on top of the expanding muscle. Chad loved it, because it made it easier for him to grope himself. Eventually even the parts of his body that weren't being groped started giving off bursts of pleasure. He openly moaned now, as his face felt like it was being pulled and pushed by a million tiny hands. His moans cracking and getting deeper as he completely lost control of himself. He felt his stomach expand and turn into a soft pouch that was now rubbing against his dick.
He looked down at his dick for the first time since the transformation had started. It felt different from the rest of his body, it was as if it was being compressed tightly. As his thighs grew his dick was pressed by both sides against his belly. He felt his orgasm coming and reached a hand down. As soon as he grabbed his dick he came. His eyes rolled up as he shot all over himself, but as he came the pleasure only grew, his dick felt very constricted now, it was almost like it was...
Shrinking. He felt it with his hand, it was shrinking in his hand. At the same time as it shrunk in length it seemed to be getting fatter. He felt like he should freak out but all he could do was stare at his dick as it shrunk. He felt another orgasm coming and started jerking off his dwindling dick. His whole body seemed to breathe in for a second and then as he came, there was a final wave of changes. His muscles grew one last bit. His voice got a note deeper. His bodyhair grew a bit more and his dick shrunk one last inch. From his previous 7 to now a very thick 4 inches.
He barely had time to take in his changed body, as he came out of his bliss he noticed a loud banging on the door. Lili sounded very worried, as she seemed to be trying to reach Chad in the bathroom for some time now.