(My bad - we'll retcon it to Mei not knowing, then.)
"I'm glad to see you understand things." Aki's father returns to his drink, finished with her. "Send the ambassador in on your way out, please." As Aki leaves the room, she sees a fat, middle aged man in an expensive suit waiting on a couch outside.
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He smiles as he sees her, standing and walking up to her. "Aki-chan! It's been too long!" He says jovially, even though she barely knows who he is - it's not exactly like the elder Tachibana has a shortage of fat old lackeys. "I hear you're going to school in America. You know, I just got made into the ambassador to America, thanks to your father - I'll be leaving about the same time as you! You should come visit me some time. Perhaps I could...tutor you, or something?" He asks hopefully, voice friendly, though the way his eyes roam makes it clear that his intentions are less than innocent.
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The next day, Mei steps inside the room with her brother and his girlfriend, pouting angrily at Aki's comments. "Hmph... Actually, I think I'll go find myself a guest room. We can train tomorrow. But Aki-san..." She leans in and whispers into Aki's ear. "
My brother came a long way to get here. Maybe you should show him a good time?"
Did... Did Mei say something, or...? Odd, Aki thinks, as the young woman leaves the room - she can't remember. Whatever, she's gone, and Aki has a boyfriend to entertain.