Rarity walked into her sister's room to say goodnight and realized she was drinking water.
"Sweetie Belle, you might not want to drink this late. We don't want any accidents now do we?"
Sweetie Belle put the glass on the table. "I haven't wet my bed in years, Sis!"
"Alright, But if you wet in the morning you'll be sorry." Rarity warned.
"I promise I won't." Sweetie Belle said.
"Very well. Goodnight." Rarity kissed the younger unicorn. "I love you."
"I love you to, Sis." Sweetie Belle returned the kiss then laid her head on the pillow.
Rarity smiled at her sister, lifted up the glass with her magic and left the room.
...
Morning came to soon for Sweetie Belle's taste. She shifted on her side as sunlight came through her window. The light soon filled her room, making sleep a vain pursuit. She stretched, thinking about all the things she wanted to do that day as it was a saturday and school was out. Suddenly she gasped. Her bed was soaked!
Oh no, oh no, oh no, oh no, oh nooo!
If she had been at her parents it'd be different. They never scolded her about the occasional accident. But she had no idea how Rarity would react. Rarity might even give her a spanking! Or worse, not let her stay over anymore! Although she'd much rather be spanked than permanently banned from her sister's house neither option was appealing. She quickly pulled the sheets off the bed. That's when Rarity came in.
"SWEETIE BELLE!" She shouted when she noticed the sheets were wet. She shook her head. "I TOLD you not to drink all that water last night!"
Sweetie Belle sniffled. "I didn't-"
"You should honestly know better! What is wrong with you, doing this sort of thing at your age!"
Sweetie Belle burst into tears and ran out the room.
"Oh my. Did I go too far?" Rarity asked herself. Rarity decided that she'd give the filly time to cool off and collected the wet sheets.
After washing the sheets and hanging them up she realized Sweetie Belle had not returned. Sweetie Belle never missed breakfast.
Isn't she going to be hungry? I simply will not have my sister being hungry. Rarity thought to herself. She began to look for the missing filly. While she was seearching the street she ran into Twilight.
"Good morning Rarity." Her fellow unicorn greeted.
"Good morning, Twilight. Have you seen Sweetie Belle?"
"I did. She looked upset. Is she alright?"
Rarity sighed. "I...I yelled at her."
"Why?"
"She...she wet the bed."
Twilight's expression hardened. "That's not something fillies her age can control."
Rarity avoided Twilight's gaze. "I know, but...I just got frustrated."
Twilight sighed. "My mother got frustrated at me about it too."
"You used to wet the bed?" Rarity asked.
"It's a common trait among fillies with anxieties. Believe it or not I used to have a lot of anxiety problems." Twilight explained. "And yelling at her will make it worse."
"You're right." Rarity agreed. "Anyway I want to find her. I...I need to apologize don't I?"
"I'd say you do." Twilight said.
"I'd better go find her. Thanks for the talk Twilight."Rarity said as she trotted away. The first place she decided to look was Sweet Apple Acres. She knew that her sister and Applebloom were close friends and she saw the young earth pony bucking trees with Applejack as she approached the orchard.
"Good morning, Applejack, Applebloom."
"Mornin' Rarity." Applejack greeted.
"Have you seen Sweetie Belle? I'm afraid we had a bit of a tiff and I would like to make up with her."
"I ain't seen her." Applejack said.
"She might be at the clubhouse." Applebloom said.
"Ah, I bet you're right." Rarity said
Rarity turned and trotted towards the CMC clubhouse. It didn't take long to reach.
"Sweetie Belle? Sweetie Belle? It's me Rarity."
"Sweetie Belle isn't here." A gruff, sleepy-sounding voice answered. Scootaloo walked outside the clubhose.
"Scootaloo? Why are you in there?"
"I sleep here when Mommy has her special juice."
"Uh-huh. Well, then." Rarity made a mental note to call Foal Protective Services as soon as she could. "Do you know where Sweetie Belle might be?"
The young pegasus attempted to gracefully fly down, but stumbled instead. Rarity helped her up.
"I bet she's at the supers-duper secret meeting place."
"The super-duper secret meeting place?"
"Yeah, it's at a river in the woods. I can find her for you."
"I need to talk to her."
"But you have to swear to keep the meeting place a secret okay?"
"I swear."
"Super-duper swear?"
"Yes."
"Super-duper-duper swear?"
"Yes." Rarity said beginning to get annoyed.
"Super-duper-duper-duper-"
"I SWEAR BY THE SACRED BLOOD OF THINE ANCESTOR POSEIDON, FATHER OF THE PEGASUS RACE, I WILL KEEP IT A SECRET!" Rarity shouted.
"Um...okay then. Follow me." Scootaloo said. She got her scooter, which was lying by a tree, and beckoned Rarity to follow her. Rarity galloped after her till they reached a pristine river far in the woods. Just as Scootaloo had predicted Sweetie Belle was sitting at the banks of the river, forlornly staring at her own reflection.
"Hi, Sweetie Belle! Your sister was looking for you." Scootaloo said.
"Oh, hi Scootaloo." Sweetie Belle said turning around. "Say were we going to meet today with Applebloom?"
"Oh, yeah. Competitive eater cutie marks here we come!" Scootaloo cheered.
Rarity had never seen a competitive eater cutie mark and was quite certain her sister would not be bearing one upon her flank.
"Sweetie Belle we need to talk." Rarity said.
"Should I go?" Scootaloo said. "You know what? I'm going." She got back on her scooter and wheeled away.
"Are you going to yell at me some more?" Sweetie Belle asked, her voice dripping bitterness.
"No and I shouldn't have in the first place." Rarity sat down beside her. "You know how sometimes you hurt someone's feelings and Mommy and Daddy or me make you apologize?"
"Yeah."
"Adults can mishehave too. I know that's not very reassuring, but it's true." Rarity placed her hoof on Sweetie Belle's shoulders and drew her into a hug. "I misbehaved and I hurt your feelings by yelling at you about something you couldn't control and I'm sorry."
"I'm sorry too, Sis." Sweetie Belle said.
"Don't be. You did nothing wrong." Rarity assured her.
Sweetie Belle sniffled. "I was afraid y-you'd spank me-"
"I wouldn't. Not over something like that."
"-Or th-that'd you kick me out of your house."
"Oh, now that is ridiculous!" Rarity said. "You are my sister!" She held Sweetie Belle tight and placed a kiss on her forehead. "My home is always open to you and don't ever forget it."
Sweetie Belle smiled. "You mean that?"
"On my honor I do." Rarity said.
Sweetie Belle returned the hug.
"I forgive you, Sis." Sweetie Belle told her, touching her little horn to her sister's.
"Thank you." Rarity told her, enjoying the feeling of her younger sister being so close to her. "I love you, you know that right? I don't always show it, I know, not like the way Applejack shows it to Applebloom, but I do love you."
Sweetie Belle smiled. "I know sis, I know. I love you to."