[Shinnosuke just blinks at first. Nobody is looking at him anyway; they've all turned to the young man who has just betrayed some kind of familial relationship to Shinnosuke. Of course Shin doesn't have a younger brother in reality. But there is one person in the world who does call him, "Shin-niisan".
Shinnosuke doesn't know whether to laugh or get mad. He decides on the former, smiling a little.]
How do you know my "little brother"? [Hopefully his tone will make it evident to the young man that Gou isn't really his little brother, though the rest of the class can think so if it helps them stop being curious.] And you are...?
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Shinnosuke doesn't know whether to laugh or get mad. He decides on the former, smiling a little.]
How do you know my "little brother"? [Hopefully his tone will make it evident to the young man that Gou isn't really his little brother, though the rest of the class can think so if it helps them stop being curious.] And you are...?