I NEED satosugu or sasunaru (or narusasu idrc) fics plsss someone recommend me someee 😭...

if u mean doujins then "kura no ryuukeichi" and "do not go gentle into that good night" (by shi ni er san i guess) for stsg.
also, "achilles come down" by hotcocoaaa on ao3 is a good fic.
i dont read stsg fics i love the canon doomed yaoi sadness too much they're like gods to me stsg is my religion im the biggest stsg devotee (after gege akutami , cuz gege akutami was so high on that yaoi crack when writing stsg he outdid himself there'll be no relationship as good as stsg ever, i fear) I live n breathe stsg.