Your new lion mom groomed you in a manner that was as gentle was it was unrelenting. She seemed determined to get every speck of dirt off of your tiny naked body before moving on to anything else. How dirty could you be though? You had just fallen in a fountain and then been brought here. Yet she continued to groom you.
You felt her tongue against your back over and over and over until suddenly... The sensation changed slightly. It was like her tongue was suddenly getting some form of resistance as you became aware of the fact that it was getting warmer. It felt... nice. She continued to groom you as you closed your eyes and the warm sensation spread over your entire body as she groomed it. Occasionally she'd roll you onto your stomach or back onto your back to make sure she could get every part of your body. Eventually, you felt the comforting sensation everywhere. You opened up and looked down at yourself and gasped in surprise. There was a very good reason you were warmer. Every part of your body was now covered in light golden fur, just like your mom's.
She didn't stop there though. She licked her free forepaw that wasn't holding you before rubbing your ears. Your felt them shift, becoming larger and round and could feel them slide up the top of your head. She rolled you back onto your stomach then and gave a long affectionate lick down your spine, as it ended you felt your new tail, a thin golden whip ending in a mass of brown hair grow out from you. With these changes done, she groomed you again head to toe, and as she got to your toes thick pads formed on the bottom of your feet as short claws hidden by seemingly massive paws developed.
The changes complete she finally released you, you tried to get up to take a look at yourself. The only way you could support yourself was to get on all fours, but that mostly seemed to be due to age. Your hands still looked like hands, and though you had paws for feet it looked like you'd still be walking on two legs when you got older. It seemed your new mom had changed you into something blurring the line between animal and human. You looked up at your new mom blinking unsure how to feel yet and unsure of what came next.