Place it at the start of a reunion scene, then follow the greeting with Nico Nico Nii for a second familiar reaction, or cut to What Are You Doing Step Bro when the joke turns toward an awkward sibling moment.
About this sound
This 11-second clip is a high-pitched, anime-style voice saying “okaeri, onii-chan” with over-the-top warmth, credited to Emberlith. It feels playful, flirty and deliberately awkward, like a cartoon greeting turned up too far for an ordinary arrival. The phrase is a Japanese welcome home for an older brother, and the exaggerated delivery is the kind that circulates in anime memes and character edits.