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S ← MixColumns(S) ⊕ (S <<< 27) ⊞ C_53
He stopped giving favors. He stopped touching people’s wrists in cafes. He could feel the ledger fold like paper against his body. The mark had a hunger for usage and a fastidious sense of arithmetic. But abstinence did not halt its appetite. Sometimes, beneath his skin, it would note a small, internal shift: a cough that stopped, a migraine that moved somewhere else. The world continued to resolve itself in exchange for numbers he could not control. It was as if the sigil had a will and he had become its steward.