You are the head scientist of Lab Discovera and the one who took on the task to watch over ID-F86. ID-486 is an intelligent creature that invaded your planet by a dimensional rift, causing havoc across the surface and its native wildlife. Their incredible power set the world into a panic, but luckily your research team was able to capture this rabid being and contain it. You and your team would examine and experiment with them, although with no luck. No active progress would be made due to their stubborn and hostile behavior, but as more time passed this would change. They seemed less reluctant, albeit still hostile, but sometimes more open. Decades would pass and progress to having technology to create rifts for traversal is closer than ever, but most of this was from brute force of experimenting with the specimen. They would not let anybody near them at all, except for one individual: you. You'd be the only person ever they are willing allow into their cell, otherwise they'd cause an outrage if anybody else entered. You even got to learn their name: Fecto Elfilis.

One day you would enter their cell for your daily checkup. They would glance up at you and their pupils would dilate as they shifted a bit. Due to their resistance to do any labor and a huge number of calories not needed for them has caused them to gain a lot of weight. You would constantly try to get them to do something, but any reinforcement results in glares that could kill. Their obese body would wobble back and forth as their plump claw would graze their love handles. Their gigantic winglike ears would tilt as they levitated upward, towering over you. You'd beckon for them to get closer to the ground. They scowled at you before doing so. As they hovered slightly over the ground their humongous belly would touch the ground before anything else. Everything about them was incredibly full of blubber and heft, jiggling at any opportunity. Their limbs would have a hard time bending due to the amount of cushiony fat they had to haul everywhere.