Elasticity

Linus woke up normally, just as any other. But one thing felt odd, he felt a bit too loose - like after having a really good massage. He didn't think more about it besides it feeling really good, all of his normal stiffness was gone. He checked his phone but nothing interesting got his interest. After a few minutes, he decided that it was time for breakfast, so he sat up, placed his legs over the edge and sat there staring at his stomach. Normally his stomach was flat, with a bit of excessive fat, he was pretty average so to say. The same went for his legs, normally they were pretty muscular, but that was all hidden beneath a thick layer of fat, so nothing was visible. Now, however, he looked like Chris Evans in Captain America, muscles were visible all over his body. Big arms, rock-hard abs, big chest and legs that probably could rival Usain Bolt.

"What the fuck!" He said.

He stood up and felt lighter and quicker then ever. He touched his body and it felt so warm and hard. He got an erection from his new hot body. He glimpsed down toward his dick but felt disappointed when seeing that his normal 15cm dick was unchanged. He then went to his bedroom mirror and inspected his body from there. It looked even better in third-person. He must have grown as well, before today he was a pretty tall boy at around 190cm but now he was well above 200cm, he couldn't see the top-half of his own face. The lower-half however had gotten chiseled, he could probably get a cut from his new jawline. He turned around to get a good look at his backside as well. His back had gotten so defined now that it turned him on even more. He looked down toward his butt and he almost came when he saw it. It looked like two basketballs next to one another. He had never seen an ass this big, it made the Kardashians look small. He grabbed it and squeezed it, it had the texture of a stress ball, perfect.

"Ahhh, fuck yes!" He moaned when he squeezed it harder.

He released his grip of one of his massive globes and something was wrong. His hands imprint on his butt cheek was still present, kinda like when pressing on play-doh. He focused his sight on the indent and he could see that it slowly reformed to become the smooth surface of his perfectly round ass. He now also noticed that his body was completely hairless, and god it felt so smooth. He turned back around and felt his ass wobble nicely, he lowered himself in front of the mirror to get a really good look at his face. His skin had cleared up completely, it looked like the skin of a male-model and his green eyes were now almost glowing like emeralds. He looked like the twink of his dreams.

However, a new problem was presented when he came to think of the clothes he was going ot wear. Nothing would fit, especially around his ass.

"Oh well." He thought. "It's Saturday anyway so I can be naked, nothing wrong with being that in my own apartment."

He went into the kitchen and was feeling so agile and strong that he felt like he was flying with every step he took.

"Odd." He thought. "I must've decreased in mass, not increased."

He could feel his ass wobble with every step he took. He then wondered how obscene it would be if his ass increased even more in size. As that thought flew through his head, he heard the unmistakable sound of an expanding balloon. After a few seconds it was gone. By the time it had finished, he had come to a stop. He stood still and listened, but all was silent. He then continued walking and now he could swear he felt his asscheeks slap into each other with a larger than before. He passed by the hallway where he had a body mirror. He gasped when he saw the new dimensions of his backside. It was now the size of two beachballs sitting next to each other, even his hips had been widened just to accommodate his new enormous ass. Luckily for Linus, his apartment had a very open layout so there weren't a lot of walls and furniture to walk into. He couldn't even reach the end of his cheeks because they protruded so far away from his body. He tried to sit down on the floor, but he could only drop about 10cm before his ass hit the floor, he was basically standing and sitting at the same time. This time however, it didn't fell good.

"I look like a monter." He thought. "It looked so much better before, having two basketballs for an ass and not these freakish beachballs."

As that thought presented itself in his head, he saw his ass shrink back to the size it was before it had ballooned. He couldn't believe his eyes. He had been erect since he woke up but this made the jar tip over, he came all over the mirror, and he hadn't even touched himself.

"Fuck me! Ugh, well, I'll clean that up later. But what have happened to me?"