Miyuki is returning home and anxious to see her brother. After she enters her home, she heads for Tatsuya's room. As she knocks and announces herself, Tatsuya grants her permission to enter.
To her surprise, there was one more person in the room. Standing within the pile of books was a short girl who was no more than half head taller than Tatsuya who was sitting on his chair.
It was the Student Council President- Saegusa Mayumi.
Seeing a girl and boy alone in a closed room, a wave of anger (jealousy?) enveloped her heart. "....."
"So it's done Tatsuya-kun."
"Huh? I...."
"Oh? You've received it and now you want to throw big sister's agreement aside?"
Mayumi used a tone similar to an abandoned kitten. Even if she believed Tatsuya's character, Miyuki couldn't help but wonder if Tatsuya did something unspeakable to Mayumi.
"No, this...."
"Hu Hu, ok, I'm leaving."
Mayumi clapped her hand together, turned around toward Miyuki, and winked at Miyuki. As she walked by, she slipped out her small tongue like how a lover is caught leaving by the legal wife.
"Big brother, what is this?"
Miyuki thought it was strange that Mayumi didn't say anything to her, but her good upbringing and manners prevented her from directly asking.
Confronting Tatsuya, the normally kind and collected Miyuki couldn't contain her anger. With an abnormal Miyuki standing in front of him, Tatsuya was caught off guard by her behavior. He then rose up from his seat. As Miyuki walks in front of Tatsuya and looks up into his eyes,
"Oni.... Oniichan, you...., no, why is Saegusa senpai here?"
In the last part of her sentence, the pitch was raised by 8 degrees with a subtle shaking voice. The whole room's temperature was rapidly decreasing.
"Oni.... Onichan, I.... I...."
A pair of hands ruffled with Miyuki's hair.
Miyuki let out a very satisfied look like how a kitten receives love from its owner.
"What if I told you that she was here to ask the whereabouts of Suzune? Would you believe me?"
"AH!"
Simultaneously, the brother and sister both said, "How mischievous!"
In the next part, Miyuki catches a fever. After taking the next day off, Isora called Tatsuya to see what's wrong. Tatsuya told him that Miyuki is sick. Kanon butts in and asks if Miyuki's ok. After a while, Kanon and Isora told Tatsuya that they would be arriving later in they day.
Soon enough, they arrived except.... they have company- Mayumi.
"Huhu, what's wrong? You're not welcoming in big sister?"
"Saegusa senpai..., no, thanks for caring about my sister."
"Since Miyuki is sick, I, as her supervisor, ought to come over and see how she is."
Tatsuya thought to himself, "Yeah right, you must have some other unsaid motive."
Tatusya then welcomes her, "It's rare for you to visit, how about coming in?"
Hearing this, Mayumi lets out a smile.
After Tatsuya unlocked security and opened the door,
"I've returned!" (Using a wife's honorifics and in reference to her earlier trip in this chapter)
"!?"
Tatsuya wasn't too sure how to respond to this sudden statement.
"My lady, master says that he'll return later today."
Tatsuya could only go along with Mayumi. If he didn't go along with her games, he would be walked all over. The best way to handle these situations was to simply play along.
"Hm.... must you be a servant? You're giving me the cold shoulders here...."
Mayumi raised her lips, walked in front of Tatsuya, and pointed Tatsuya in the chest, "You ought to understand a shoujo's heart more...."