He stared at the screen. His face, which had been a mask of sorrow, flickered with something else. Confusion. Hope.
This reads like a from Japanese net slang mixed with English “verified” irony. Possible interpretations: uchi no otouto maji de dekain dakedo mi ni kona verified
He panicked. He tried to hide the letter by shoving it into his pocket, but his hand was shaking so hard that he fumbled it. The tiny paper fluttered down… and landed directly on top of her head. He stared at the screen
了解しました。以下は「うちの弟、マジでデカいんだけど（身に纏う）」のテーマに沿った、しっかりした日本語のエッセイ（検証済み風・整った文体）です。約600–700語で構成しています。 uchi no otouto maji de dekain dakedo mi ni kona verified