Think of #after as a filter on the wider porn caption caption archive: same submission pool, but slimmed down to the exact register you searched for.
The page pulls in after-tagged captions, plus caption GIFs where after is a secondary tag, plus roleplay posts whose title text overlaps with the after keyword — three sources into one feed.
The tag's structured data (Schema.org CollectionPage + BreadcrumbList) is emitted on every render, so Google and Bing treat this as a real porn caption sub-hub rather than a query results dump.
Bookmark this tag if you want a direct route into new #after caption drops without scrolling through the wider porn caption firehose.
Every #after post is a standalone URL with its own share preview, alt text and interaction counts.