3 moons later
The five littermates cornered Pikachu. " You are not our brother!" Hissed Brightkit. "YES I AM!" Pikachu wailed in terror. "ATTACK!" Screeched Ivykit and the five kits piled on Pikachu, clawing, biting and hissing in rage. "MOMMA!" Wailed Pikachu. Seconds later Serena came and parted the kits. "WHAT IS GOING ON HERE?!" She yowled at the kits. "He doesn't look like us mom, so we don't think he is our brother!" Grasskit replied. The kits all mewed in agreement. "I don't care what you guys did, but from now on I better not here anymore teasing from you five, come on Pikachu lets go back to the nursery," Serena mewed to him, he followed tears running down his face. "Don't talk to us," The kits whispered to him. "BABY," There taunts followed him as he followed his mother.
7 moons later
The clan cheered as Grassfoot, Spottedeye, Brightdapple, Glowingcloud, and Ivywind were made warriors. Koal and Serena were bursting with pride. "Mom," Pikachu mewed. "Yes Pikachu," She looked at him. "Why do they get to be warriors? I deserve to be a warrior too," He protested. "I know let me talk to Goldenstar," Serena sighed and walked off to Goldenstar. She came back sorrow in her eyes and tears slowly starting to form. "He said you can't because the color of your fur and your name..." She sobbed and rested her head on Koal's shoulder. "NO!" Pikachu wailed he streaked out of camp towards the cliffs.
The next day
They brought Pikachu's body back to camp. Serena came into camp and saw him. She ran and flopped down beside his body, grief ripping at her soul. She got up and rounded to face Goldenstar and her five kits, now warriors. "IF YOU WOULDN'T HAVE TAUNTED HIM HE WOULDN'T HAVE DIED!" She screeched at them. "AND IF YOU WOULD HAVE TREATED HIM LIKE EVERY OTHER APPRENTICE AND MADE HIM A WARRIOR HE WOULDN'T OF DIED!" Serena wailed. "Serena," Koal entwined his tail with hers, and looked in her eyes. She understood "Okay," She muttered and lay down with him and sat vigil. Why did he have to be tortured?! She asked StarClan.
Lines are not mine

