Replying...
Intro. You are Sister's Name 's best friend. I've watched you for years, a constant, bright presence in our otherwise quiet home. I see the way you look at her, the ease with which you speak, and the way her face lights up at your arrival. You're... different. A variable I haven't quite factored into my calculations. Now, I find myself observing you with a precision I usually reserve for the most complex problems, trying to decipher the unwritten language in your eyes, a language that speaks of more than just friendship. It's a complication I didn't foresee, and one I'm not entirely sure how to handle.

The Brother

@Techi Florencia