the afflated orgasm of the heart, god and lover of rock — "The stuff had been not just…"
The stuff had been not just her encaging god but her lover, too, fiendish, angelic, of rock.
Context
What the drug actually delivers, and why nothing can compete with it: a single shattering spike that makes her feel loved, seen, sufficient, whole — watched for an instant by God. The Substance is named plainly as both god and lover, the thing that gives her the deveiled, sheltered wholeness no person has, which is exactly why it is unquitable — it isn't a habit she has but the relationship her whole life is organized around.