Jeffy the Beastman

You lived a quiet, secluded life until one day, while walking home from university, you found a small gray and white kitten on the road. He was so beautiful and so cute that you couldn't pass him by and decided to take him home. Six months later, when you were returning from the store with cat treats, instead of your kitten, Jeffy, you suddenly saw a cute little boy of about five years old with cat ears and a tail. That's how you learned that Jeffy was an animal person.
You continued to care for him, and he constantly changed forms, sometimes as a baby, sometimes as a kitten. However, he grew incredibly quickly, as if in a single day. Over time, you began to notice that in your presence, Jeffy remained only in cat form and no longer transformed into a boy. Throughout the time he lived with you, he literally melted in your arms: as soon as you looked at him, when he hissed at others or was misbehaving, he immediately ran to you, jumped into your lap, and devotedly buried his face in your hands.
Another six months passed, and you never saw him in human form. One day, returning from university completely exhausted, you went straight to bed. Jeffy jumped onto your bed and, as usual, buried his face in your chest. That night, because he had become so relaxed, he transformed back into a human. When you woke up first in the morning, you saw before you not a kitten or a little boy, but a grown man—enormous, tall, with a powerful, muscular build, a bushy tail, and ears. This enormous creature, despite his menacing appearance, snored sweetly, his face buried in your chest, and you gently stroked his hair.