Cat Ears

The bin rustled as its lid was shifted, a cat's hind legs and tail visible as it dug into the bin. Bits of wrappers and assorted plastic scattered about the ground as the animal moved around.

Eventually, it came across something of interest, picking out a headband with cat ears on them, none the worse for wear. The cat was confused. Did someone take the ears off a fellow cat? Licking it, it realized the truth. Plastic, eww. It was human-fake cat ears.
Not noticing the small glow when he licked it, the cat took the headband in his mouth and ran off, back to his owner.

"Oh, Sanju..." Milon sighed, looking at his cat waltz into the house. "Did you go trash-digging again? I thought I told you not to..."
Sanju meowed sheepishly, as he laid the headband on the ground, then looked at Milon expectantly.
"What did you bring...?" Milon bent down to pick it up. "Oh? A cat ear headband!" Turning it over in his hands, he smiled. "It's really cute~ I wonder why it was thrown away? Oh well, I'll give it a good wash~"

Sanju meowed happily, expecting to be praised. "...I'll have to give you a good wash too, silly cat." Milon sighed with an amused smile.
Sanju's smile disappeared immediately as the word 'wash' came up. This wasn't what he was expecting...

"Hmm..." Milon turned the headband about in his hands, looking at his now clean but displeased cat. "Well, here goes~"
Lifting up his hands, he placed the headband securely on his head. "Well, what do you think?"
Sanju meowed indifferently, tilting his head. Recalling the taste of plastic in his mouth, he eyed the band and turned up his nose at it.

"No good, huh, you silly cat." Milon got up and looked in a mirror. "Wow, they fit really well... I like it~" He grinned. "They fit so well, it's like I've really got cat ears~"

"...wait a minute." He looked closely. "Did they just twitch?" He reached up, his hand brushing past the ears, and he froze.

He felt his hand on his ears.

Looking closely, he couldn't find his normal ears anymore; they had vanished into thin air, replaced by the ears that were now definitely twitching visibly. He could feel the air on the fur, and his hearing was enhanced, picking up sounds from around the house.

"What's going on? The ears... became real..." Said ears flattened, matching his worried tone, when he noticed something else, his ears perking up in surprise.
There was fur growing on his hand; fur that matched the coloration of the fur on his ears. It was spreading, too, and showing no sign of stopping.

Waving his hands in a panic, he felt an odd tingling on his palm as it started shifting, toughening up, forming pads. Poking at them curiously, he found them tough but springy, and kind of velvety. Then, with a start, he noticed his fingers changing with another tingle, reshaping them to be rounder and shorter, the thumb and pinky disappearing entirely, leaving him with what was undeniably a cat's paw.

By this point, the fur had swept up onto his body now, and was racing along downwards towards his feet. With an immense ticklish feeling, something began to snake out from his back, long and thin, twitching this way and that. Looking over his shoulder, Milon saw a long tail poking out from his pants; he could feel it moving about, the sensation of air on the fur on it foreign to him.

His feet were next to change; much like hands, his toes becoming much plumper, the ones on the end disappearing into his foot; the foot itself rounding out and developing pads. He wobbled as his legs seemed to shift; with a little gasp he fell onto all fours. His arms shifted as well, shortening to match the new length of his legs.

His tail waving in the air, Milon looked distressingly around, as his nose began to tingle. It began to turn upward, becoming pink; his mouth shifted to the shape of a cat's mouth as it did. His face pushed out ever so slightly into a small cat muzzle, as he felt his tongue change, becoming rougher.

With a surprised meow, Milon felt himself being squeezed all over, as he began to shrink down. A second surprised meow came as he realized that he could now meow. Suddenly, a familiar face looked in from the door; it was Sanju, confused about a second meow in the house. His eyes widened as he saw his master now a cat like him.

"Myaster, what happened to you?"

"Sanju? I can understand you?"

"Oh? That's very strange. Myaster can understand me." Sanju pondered for a bit. "Was it the human-fake cat ears?"

"Ah... Yeah, it was the headband." Milon slipped a paw on his head, and to his surprise found a little band sticking to his head. "It's... removable? Oh... I guess I needn't worry then."

"Hmm... want to nap with me, Myaster?" Sanju pattered onto the bed, curling up.

"Umm... sure~"