The next day at flight-school was a terribly long one for Rainbow Dash, as she was incredibly eager to get back to the orphanage to see Scootaloo again. Her eagerness showed up in how she flew, even faster than usual, causing her to break a previous record she had set. After what seemed like a thousand years had passed, the bell rang and Rainbow Dash took off for the orphanage, performing a sonic rainboom in the process. Rainbow Dash was a bit too eager and almost slammed into the door of the orphanage, skidding on her hooves to stop inches from the door. She then knocked on the door a few times and within seconds the elderly mare answered it again.
"You made it here at a perfect time , all the foals just had their lunch and are now all in the play room. They need your supervision. Oh and I didn't get your name yesterday, mine is Mary Trottins by the way."
"My name is Rainbow Dash, Mary. So where is the play room?"
"Up the stairs right here and it will be the first door on your right, next to the changing table."
"Thanks I'll get right on it, you can count on me!"
Rainbow Dash gave an affirmative salute and rushed off upstairs. As she walked up the creaky steps she could already here the sounds of foals playing and having fun; though over all the noise Rainbow Dash thought she could hear a familiar cry, that of Scootaloo. When she entered the room she saw about twenty fillies and colts running/flying around. She then scanned around for Scootaloo who wasn't easily found, She finally spots her over in the back corner, sitting alone crying, and holding that Wonderbolt plushie. As Rainbow Dash walks over to her she has to duck to avoid some flying foals and watch her step to not step on the crawling foals.
"Scootaloo? It's me Rainbow Dash, I'm back, there's no need to cry."
Upon hearing those words Scootaloo dropped her toy in astonishment and turned around to see her new cyan caretaker. Sootaloo buzzed her wings in excitement and crawled up to Rainbow Dash, and gave one of her front legs a hug.
"Mama?"
"No Scootaloo, I'm not your mom like I said so many times, but I'm you sister, can you say sister?"
"S-s... S-si...Sis"
Scootaloo struggled to form that new word and resorted back to one of the only few words she could currently say, which was Mama. Rainbow Dash finally accepted that is all Scootaloo might say to her for a while and decided to let it go at that. She then picked up the bouncing little filly and went over to a rocking chair to sit down. Surprisingly other than breaking up a few fights over a toy and making the few most rambunctious foals settle down, watching them all wasn't that much of a task for Rainbow Dash, allowing her to spend more time with Scootaloo. After she rocked Scootaloo for a few minutes the energetic filly became restless and squirmed around in her sisters legs. as she wanted to go back to playing with her toy.
"Alright Scootaloo I'll set you down, go have fun."
As soon as Rainbow Dash plopped Scootaloo on the ground the filly quickly crawled over to the corner she left her toy at, only to find another pegasus, a small red colt, already playing with it. Scootaloo loved that toy as much as she loved Rainbow Dash, and tried stealing it back, though she was unable to pry it out of the colt's strong grip. The now angry filly then bit the colt on one of his arms. He winced from the pain and dropped the toy; then he cried loud enough for Rainbow Dash to take notice. She quickly hovered over only to see Scootaloo happily hugging her plushie and the little red colt crying and holding one of his front legs. Rainbow Dash then lifted his hoof to to find bruised bite marks the same size of baby pony teeth, luckily though the skin wasn't broken. The mare then carefully picked up the crying foal and attempted to comfort him. She then turned her gaze to Scootaloo and asked:
"Scootaloo! What happened?"
Scootaloo looked up with a guilty expression on her face, tears almost forming in her eyes, and said:
"T-toy. Mine."
Rainbow Dash was then able to figure out what happened, and her face maddened as she glared at Scootaloo.
"That wasn't nice Scootaloo! You need to share! Now I'm taking your toy away as punishment!"
Though she hated herself for doing it, after Rainbow Dash yelled at Scootaloo she set down the still crying colt and grabbed the Wonderbolt plushie Scootaloo was holding on to. The filly refused to let go and held on tight, being lifted up in the process. Rainbow Dash was then able to pry her apart from the toy, giving it to the colt, which stopped his crying. Scootaloo then went into full on tantrum mode, and started flailing her legs around as she shouted "Mine!". Rainbow Dash was fed up with Scootaloo's antics and said:
"That is enough Scootaloo! You better calm down now because I'm giving you a timeout."
She then carried Scootaloo over to the empty playpen in the room and attempted to set her down in it; but Scootaloo had grabbed onto her rainbow colored mane and pulled tightly.
"Come on Scootaloo let go! You're just making this worse for you."
Eventually Scootaloo grew tired of fighting back and finally let go of her sister's hair. Rainbow Dash then set her down in the playpen, also removing the few other toys that were there. The orange filly became extremely upset and started crying as loud as she could, while banging her hooves against the side of the playpen.
"I'm sorry Scootaloo but you made me do this. Now I'm going to leave you here for ten minutes, so you better think about what you did to deserve this."
It was only her first day with Scootaloo which wasn't even over yet and already Rainbow Dash was frustrated with her sister, though to credit Scootaloo, she was still a baby pony.