受験生を応援する香澄夜空さんです。

R-18バージョンがこちら。
pixiv #102952359 "»":[/posts?tags=pixiv%3A102952359]

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Source: post #5903293
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It's Yozora-oneechan cheering for students preparing for exams.

R-18 version is here:
pixiv #102952359 "»":[/posts?tags=pixiv%3A102952359]