This suggestion was from The True Nobody, I've added a few of my own touches.
Xion, and Larxene were on a mission, most know how Larxene acts on missions, Xion knew by experience not to make Larxene angry, but she wasn't doing so good on that part.
"Xion, keep up." Larxene said coldly.
Xion nodded, and walked a bit faster so that she could keep up with Larxene.
Larxene sighed, "Do you even KNOW what's going on?"
Xion shook her head.
"You're useless!" Larxene replied.
"I'm sorry." Xion murmured.
At that point in time, the heartless that the two were supposed to be fighting showed itself, and Larxene was ready for action.
"Xion, start fighting it." Larxene growled angrily, trying to kill the heartless.
Xion just stood there, flustered.
"Xion, I said START FIGHTING IT!" Larxene yelled, landing the finishing blow on the heartless.
Xion looked at Larxene, "But you killed it."
"I know that!" Larxene replied, glaring at Xion.
Unfortunately, Xion didn't know well enough to just shut up and take it as it came, and she continued.
"Xion..." Larxene grabbed Xion roughly by the arm, and dragged her away, towards a small tree stump.
"Ouch! That hurt!" Xion yelped.
Larxene sat down on said tree stump.
Xion knew what was going to happen, and let out a small squeak of surprise.
Larxene pulled Xion over her lap, and landed the first flurry of smacks to Xion's still clothed rear.
Xion's clothes offered little to no protection, but yet she stayed quiet, trying as hard as she could not to cry.
Larxene continued, and with each smack, well, let's just say that the next world over could hear Xion's frantic cries for help.
By the twentieth, Xion was crying for all she was worth, which did nothing. By the thirtieth? Larxene had stopped, and not-at-all carefully stood Xion back up. "Let's RCT and call it a day, we wouldn't want Saïx or Xemnas getting mad and spanking you AGAIN, do we?" Larxene asked.
All Xion could do was A) cry, and B) nod, as Larxene led her back to the castle.
Meanwhile, Marluxia and Bob were having similar troubled as Xion, Marluxia with Xigbar, and Bob with none other than Vexen.
"Xigbar! Please! I've learned my lesson! I'll never touch your guns again!" Marluxia cried out frantically.
"Vexen! I'm sorry!" Bob yelped.
Vexen soon stopped, and leaving Bob to, well... cry. "Something as pitiful as a child's punishment... and yet he blubbers like a baby." He muttered.
Xigbar, however, continued until Marluxia's backside was a dark shade of red, before stopping, and throwing Marluxia to the ground and storming off.
Bob calmed down quickly after that, and slowly rubbed his deeply reddened backside in an attemp to stop the pain, but that brought back more pain, and Bob created a portal to his room with a mild level of difficulty, and walked through.
Marluxia, however... well, let's just say that by the time he calmed down, it was shortly after sunset. The time he spent blubbering like a baby was around three hours, and he reluctantly walked back to the Organization.
At dinner that night...
Xemnas chuckled as Xigbar told him the events of that afternoon, "If that's what it took to straighten out Marluxia, I'dve done it long ago." Then he got an idea, and quickly went to work.
"What's he gonna do?" Larxene asked.
"I dunno."
A few other members were wondering the same thing as Larxene asked, but not a lot of people spoke, and you could practically hear the crickets chirping in the backround.
Alexander, who was hugging Luxord, decided to break the silence, "I hope it doesn't hurt..."
"Ditto." Luxord nodded.
The next morning...
Xemnas had called a meeting, and many were already expecting this, all of the sixteen members came in.
"I have called you all in today to discuss something." Xemnas started. "Many of the members of this organization are using corporal punishments, and I have decided that..." Xemnas paused.
Many who have recieved said corporal punishments, wished desperately that Xemnas would end it, the others looked up at Xemnas, interested.
"...This organization will use them as an official punishments." Xemnas finished.
A few frightened yelps were heard coming from some, while others stayed quiet.
"If anyone acts childish in any way, with an exception for Alexander, since he is a kid, and only then if it doesn't affect anyone else, a reasonable corporal punishment may be chosen by the offended."
A few worried gasps were heard by the normal troublemakers, and anyone that had done something 'childish' in the last ten days started fidgeting nervously.
Alexander started crying, he stood up from his seat and ran to Luxord, hugging him. "I don't wanna be corporally punished..." Alexander sobbed.
Luxord nodded, "Nobody does."
"Meeting dismissed." Xemnas said.
Most headed back to their rooms, while others headed to the grey area to converse, and others still stayed in the meeting room, such as Alexander and Luxord.
"Luxord... I did something childish the other day." Alexander murmured. "Please don't spank me..."
"It's okay, since you told me, I'll not do anything this time."
"You don't get it... I pulled a prank on Larxene, which she hasn't fallen for yet." Alexander replied.
Just then, a lot of angry yelling was heard, coming from Larxene's room, "ALEXANDER! WHEN I GET MY HANDS ON YOU I'LL MAKE SURE YOU PAY DEARLY FOR THAT!"
Luxord, suprised, looked at Alexander, "What did you do?"
"Spread a rumor, or two, or thirty-seven... hacked into her email account and sent an embarrassing message to the Superior..."
"You did? Well, I think you sent it to the wrong guy." Luxord replied.
"What do you mean?"
Luxord sighed, showing Alexander the email that he had recieved.
"Oh." Alexander looked down, "Sorry."
"It's okay." Luxord replied. "Just, ah... next time, try not to get caught, right?"
"I'm not in trouble?"
"Well, not with me, but maybe with Larxene. And you'd best stay hidden for a while."
Alexander nodded, creating a portal to his room and running through, there he locked all seventeen locks on his door and windows, and hid under his bed.
Sorry for it being so short, I'm not really having much ideas. Though this chapter may have a bit more stuff for future references.