Blue exorcist sister

Explanation time

No one POV
"Alright class, today I will be handing back your quizzes from the other day, some of you did great." Yukio said glancing at Bon. " and some of you, could use a little more studying." Yukio finishes is he glares at Rin. Rin groans and looks away. "Shema." "Coming." "Sheami." Yukio said with a small frown handing sheami her paper. " you would've made a 100%, if you didn't put down nicknames you gave for the plants instead of the real names for them."

Sheami sighs and nods as she went to her seat. "Rin." Yukio said with a glare. "2%?!"Rin  exclaims as he walks back to his seat, while bon scoffs. " I couldn't have gotten a 2 even if I tried." " yeah well I'm not the kind of person who can sit around doing tests all day, I learned better out on the field." Rin said pointing his finger at Bon accusingly. " we all came here to become exorcist not to slack off and sleep during class like you do, you're only holding us back Okumera!" Bon Shouted.

"Well sorry not everyone is as perfect as you are, but we are all different in our own way, and no matter what you say to diss me, I'm still gonna become an exorcist. And not just for the hell of it,but for my own personal reasons, just because I'm not doing so well now doesn't mean I can't change for the better in the future, And I don't even know what your problem is with me, what have I ever done to you to make you hate me so much, just because I'm not an ideal person for you does not mean I'm
any less valuable as a human being.(more or less) everyone stared at Rin in shock,it's  not every day that Rin says something smart and wise.

Meanwhile

" hopefully, I will be able to get y/n to not bite me this time." Mephisto thought allowed as he approached her door, and he could hear whispering again. Every time I go to her door,I can here her talking to someone,but who? when I look inside I can never see anything suspicious in there. "Go away,I don't need a babysitter!"

Y/n yelled from the other side of the door. What?how could she have possibly known I was here, could the thing she's talking have told her? There's no way she could've known I was here, I didn't make a sound coming up but I know her hearing is not that good. Something very suspicious is going on.

~~~Back to Rin~~~

No one POV.

The school bell rang, signaling to the students that lunch has started, Rin immediately got up and went to get his Bento box and eat, after everyone got there food they went by the fountain in awkward silence. Izumo was the first to speak, trying to break the ice. "So Rin if you're mom died giving birth to you and Mr. Okumara, then how is (y/n) you're sister and younger than the two of you?" She questions.(BTW they know that much,but that's it) Rin Sighed And began to explain. " You see..." Rin paused for a moment trying to find the right words.

"Before my mother died, she had three children, me, Yukio and (y/n). Mephisto was there with my old man,The old man took me and Yukio and as for y/n.." Rin knew he couldn't tell the others that the reason why she could not go with her brothers is because female demons are very dangerous, so she had to be frozen in time, so he tried to came up with an excuse. so...ummm...I.." Rin was having trouble coming up with an excuse until Yukio stepped in.

"You see, Mephisto is the demon king of time, and had accidentally, put her in a time  Crystal. And when he finally got her out of that Crystal, it just so happened to be on me and rins 11th birthday." Yukio explains. "Oh... so you're saying she supposed to be our age but since she was frozen in time, she never aged?" Shema questioned. "Right." Rin said quickly, trying not to be suspicious. Before any of the other students could say anything the bell had ring signaling for their next class.

~~now back to Mephisto~~
"Y/n you know you have to eat right." Mephisto said as he tries to to feed the young demon. "No I'm not h-hungry!" Y/n Yells throwing thing across the kitchen. "Come on I thought (f/f) was your favorite." Mephisto states as he cleans up after y/n as she keeps throwing things. " *sigh* what am I gonna do with you." Mephisto questions aloud to no one in particular. "I-I wanna p-play House!" Y/n exclaimed in joy. Mephisto gives y/n a confused stare. "Why are you stuttering?" "S-s-stuttering?" "Yes, what you're doing now."

"Oh I d-don't know." Before Mephisto could question more, Yukio and Rin came home. "Were in the kitchen." Mephisto calls to them." "R-Rin play h-house w-w-wi." Y/n was having trouble forming the words correctly. "Y/n are you ok,you're stuttering a awful lot." Yukio asks with concern. "She has been all day, but I'm not sure why." Mephisto States. We will have to make a doctors appointment for you y/n,it could be something serious.

"Yukio said Kneeling down to be Eye level with y/n. She gasps loudly "A-Am I D-dying?!"
She questions with a worry expression on he face. "No no of corse not." All three males said at the same time. "We're just gonna take you to the doctors tomorrow and when we're done I will make (f/f) ok?" "O-Ok." Can I come?"Mephisto joins the conversation. "No" they all say in unison.

Sorry for spelling errors, or if it just sucks. Word count 1005