Negi-sensei...
You think I didn't see. Or you hope. You were wrong, though; there was no way I could have missed your tiny figure silhouetted by the dull morning sun. Shrouded in a dark glow, I caught a glance at the deformed shadows painted messily across the crepuscular surface of you skin, and you shook uncontrollably, tearing restlessly at your own soul as you tried to hold back the darkness. A chill ripped down my robotic spinal systems, as I traced your demonic outline on the horizon. Then you turned around, and upon seeing me, you flashed me your famous child-teacher grin, as if you were fine, as if you'd always been fine.
Why do you hide? It's not from just me- Ala Alba, the girls who cared for you as their own brother; even citizens of foreign populations, from Japan to Ostia concern themselves over you wellbeing, but you can't see it. You would have noticed it once, I'm sure: back when that smile looked less fake, less pained, and back before I knew how much you suffered at night, shying away from Asuna's bed to toss and turn on your own, waking suddenly in a cold sweat.
And all because you're being consumed by yourself, and only yourself- what might be put simply as your 'darker side'. You are no longer the charming English gentleman I secretly fell for in my robotic prime- that mahogany-haired boy with a grin that enslaved 31 middle-school hearts has been shattered into the gutters. All those shards of kindness that once pieced together are slowly dissipating into an eternal and diseased river of despair that you yourself are drowning in.
Master calls herself a "monster". I know better. But Negi-sensei: your two sides are becoming inseparable, and I'm scared that the real you come out at the other end of the tunnel.
If you ask Hakase, she might, with a bit of pushing, tell me how your my hearing your name executes a programme that brings up my personal images of you, sweet and true- a gentleman- and yet not a single one of you covered in those strange, dark patterns. It's not how I want to remember you.
You are possessed by evil, the same evil eating away at Master. It drives you down to sick and twisted magic, and you push all your students away so they don't have to watch helplessly as you become cloaked in black.
I can't untangle the distress and worry, or the love and fear, not anymore. Maybe it was naïve of me, but in the climax of my adoration for you, watching you unleash Jupiter's Thunderstorm on Chao in the school festival, my software convinced me that the almost human surge of... unadulterated desire... that charged my body when I saw you would never change. But now... I dread it, unable to shake the image of that evil glint hiding in the corner of your sad eyes.
So, I'm sealing this letter now. I maybe be a robot, with only three years of 'life', but something inside tells me it's right. They can destroy me, hack my systems, shut me down inside, but when my last LED flickers out at my termination, whether it be ten, or a thousand years into the future, I will still mean the words on this paper.
I hope the real you can still communicate through the shadows of the new you, and you can feel the pain you're causing yourself from the scrawling inking beneath your fingertips. And note who I dictate the pain to; because, after all, it's not my pain I want you to feel. Not Asuna's either, or Konoka's, or Chisame's, even though she is blaming herself for this, wishing she stabbed that scroll. It's your own pain.
The letter, which I will leave in the deepest pocket of your coat, remains, forever, the feelings of the robot who couldn't bare to watch.
Goodbye, Negi-sensei.