Dion quickly hurries into the bathroom, shutting the door behind him and locking it quickly. The boy then pulled his pants down as he approached the toilet, letting the stream flow.
Once he was done, he pulled his pants back up, then unlocked the bathroom door as he ran back to his room, hoping his sister hadn't gone snooping while he was gone. It was only a few minutes, so he figured he'd be fine.
Once back in his room, the pre-teen gets to work, editing his open profile and giving himself a fox tail. He specifies an arctic fox tail, as their tails are the fluffiest, and hits confirm.
The same pins-and-needles sensation from before runs through his body, as a sharp pain makes itself known just above his butt. "Agh!" He instinctively yelped, feeling the skin and bones stretch out of him. He recognized it as the pain he felt when he was about to grow, only this time a lot worse, the affected region changing much faster than normal growth spurts.
It didn't take long for the sensation to fade, though he still felt lingering pain. "D-Did it work?" Dion asked himself as he turned around, and then his eyes widened.
Sure enough, poking from above his butt was a giant, fluffy fox tail, its fur the same blond as his hair. "That's so cool!" The boy exclaimed, reaching a hand back to feel the soft fluff he could now call his own, running his hands down its length while thinking about what he'd do next.