That explains a lot, Mori thought, looking up at the newest member of the host club.
His cousin had never kept secrets from him, but as they had driven home the second day of the school year, Mitsukuni had turned to him. "Take good care of Haru-chan, okay, Takashi?" Mitsukuni smiled, but Mori could see the underlying seriousness of the senior. He had agreed and his petite relative went back to talking about the new cake his chef was making. They didn't speak of Haruhi again.
But he watched. Kyoya's interactions with the student were completely what he expected of the vice president dealing with a debtor. Mitsukuni treated Haruhi like a sister when he wasn't hosting, even going so far as to leave his Usa-chan with the scholarship student to serve a couple of customers himself. Mori was surprised by how unaffected Haruhi was by the behaviour of the twins, and was amused when the smaller boy got their king hooked on commoner's coffee.
He had cleaned up good too. With contacts and an Ouran uniform, Haruhi looked like he belonged there. That was when the behaviour of the twins changed. Their teasing took on a different tone, and they seemed to be eagerly awaiting something.
"Mori-senpai, help!"
Take good care of Haru-chan, okay, Takashi? In a moment, he had extracted...the girl? Definitely a girl, petite, weighed less than Mitsukuni. Vaguely, he heard Tamaki, "Um, you didn't have to do that."
As he watched her fend off Tamaki, Mitsukuni caught his eye and gave Mori a look. Do you understand? Mori nodded in the affirmative.
Mori guessed the only one who didn't know that Haruhi was a girl was Tamaki. On the day Tamaki found out, Mori had to agree with Mitsukuni on the drive home. "Tama-chan looked pretty funny when he found out about Haruhi."
"..."
"She would be a nice friend. We'll still watch out for Haru-chan, right, Takashi?"
"Yes."
"Good!" The smaller senior bounced in his seat. Watching over Haruhi will be different than watching over Mitsukuni, Mori thought. Of course, he was completely right.