This isn't exactly Komamura/Tousen, but it could be read that way, and even if you don't in involves them. ^^; Hope you enjoy.
Title: Definitions of Justice: A Letter that was Never Sent
Characters: Tousen
Spoilers: End of Soul Society, possibly light spoilers for early Arrancar arc
Summary: A letter Tousen wanted to send to Komamura, but couldn't. "I know that you would not only refuse this path, but destroy it." Some speculation on motives for certain actions Tousen takes.
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Fake cut!)