Think of #last 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 last-tagged captions, plus caption GIFs where last is a secondary tag, plus roleplay posts whose title text overlaps with the last keyword — three sources into one feed.
Because engagement counts (likes, saves, shares) are live per post, the page keeps sorting itself even without editorial intervention — the top of the feed reflects real porn captions demand today, not last month.
Bookmark this tag if you want a direct route into new #last caption drops without scrolling through the wider porn caption firehose.