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This author clearly doesn't have any siblings . . . It's easier to hurt a sibling's feelings with harsh words? It's harder to find the right time to apologize? It's more awkward to quarrel with siblings than other people? wut? Since when? That is like, the polar opposite of the truth . . . I mean me and my sister fight ALL THE TIME. We also can say pretty mean things, but it really doesn't mean much coming from a sibling since you know they don't mean it. And usually you don't even need to apologize, since you have lived together for "x" years, you are used to just forgetting about in like 10 minutes.
Also I guess Tatsuyoshi is next in line to get a special with the girl he likes . . .