You are Male for this story.
You see a Puyo specially a Yellow one from the Japanese Puzzle Game Puyo Puyo. You pick it up only for it to pop within your hands. You find more a begin a chain of Puyo pops which is the main goal of the game. A chain of 10 you got which was really good. Then a text box pops up. “Congrats here’s your reward.” You can barely breathe after the message and quickly fall into a pond. You can breathe again! You realize you must have gills now so you search for the nearest ocean or river. Luckily there’s a body of water below the cliff. So you jump into it. It feels so refreshing and you continuously breathe in and out. Enjoying the sensation. When you breathe your belly becomes bigger until it stops growing. You’re okay with the extra weight you put on since it suits you. You begin to explore only to realize your clothes are restricting your movement. So you strip down. Allowing you to move with ease. While swimming you don’t notice your bottom half changing. Your legs connect together. Soon morphing into a pleopod. Which is the of a shrimp. It’s blue but it looks nice. Then a blue and dark sea foam green shell starts to cover it. Finally your unchanged feet form into flippers. It’s colored with the dark seafoam green from before at the bottom. Yellow in the middle. And Blue at the top. With this new tail it makes maneuvering much easier. You swim for a while until you start itching. You scratch the area that is missing until you feel fur. It spreads all throughout your body besides your shrimp tail. It’s yellow fur which you think is a good contrast with your blue scaley tail. Then brown stripes begin to spread around your body similar to those of a tiger. However, unlike a tiger they stop before they reach your belly, chest and inner arms. Then your pectoral mussels become more defined in contrast to your fat belly. Then your ears disappear and pop up on top of your head similar to those of a cat since they were triangular. They had brown fruit on them while the inside had white fur. Then your mouth and nose become one growing out to become a muzzle with a big yellow nose. Below your nose white fur grows going from below your nose to your belly. Giving you a nice white underbelly. Then blue fur sprouts from the right and left side of your muzzle. Giving you blue whiskers. Finally, your pupils become white but in a cartoony way. Your transformation is complete you are now Black Tiger from Puyo Puyo. You search the seas to find someone to Puyo Puyo battle. You also make sure to worship the Ocean Prince. Since he is the ruler of the ocean after all. You let out a graceful roar. “I am just me.” You say in your new deep voice as you swim through the ocean.
Maybe you can transform people into mammal fish hybrids too!