There are several works across manga and anime that feature strong younger sisters. The specificity of the situation ("Maji de Dekain Dakedo, Mi ni Kona Fix") suggests a particular storyline or comedic sketch where the sister's strength is contrasted with her actions or presence in the narrator's room.

Dialogue says “He looms over you” but the screen is empty. No crash, just absence.

When the bug activates, you get:

The series explores themes of sibling relationships, friendship, and the challenges of adolescence. Masuzu's interactions with Akane showcase a loving and supportive sibling bond, while also highlighting the difficulties of keeping secrets and dealing with the consequences of Akane's strength.

Are you writing a for a platform like Pixiv or Wattpad? Is this a comedy or more of a serious drama ?

"uchi no otouto maji de dekain dakedo mi ni kona fix"