Your tails spread out as you feel the power spread through you and you place your curse on the adult nine tailed fox.
"What!? What are you doing!?" The voice starts as a boom but quickly becomes higher pitched as the fox starts to dwindle in size. His fur becomes a little poofier and he gets a tiny bit chubbier with baby fat coming into existence. In a few moments, he's about the same size and age as you. "Do you have any idea what you did!?" He shouted in a voice that was no longer booming or even remotely authoritative. "Oh, you know what I have to do now right!"
For a brief moment you try to think up another curse, realizing he may be ready to retaliate, but before you can do anything he jumps from his position, tackles you and pins you to the ground.
"There rawr!" The other fox let out a giggle. "I got ya! That's for cursing me when I wasn't ready!" With relief, you realize the little guy has certainly loosened up after having most of his age stripped away from him. He was certainly a lot more playful than vengeful. "Now you have to be it first!"
"It?" You questioned, not sure if you were more confused or relieved.
"Of course! Now you have to catch me!" In a swift movement the fox was off you, bounding away into the trees deeper into the habitat.
"Hey wait up!" You couldn't help but let out a childish giggle yourself after you ran after the other fox. He had a bit of an advantage on you. Even if he was no longer his older grumpier self he seemed to know the area quite well, able to remember the location of every tree root or branch and use it to his advantage. You both do a complete circle around the habitat three times before you're finally able to catch up with him. In a single pounce you land on him, sending both of you rolling down into a shallow stream, giggling the entire way.
As the cool water wets your fur and the two of you slowly climb off of each other, it occurs that to you that you've made a new friend.