If you're hungry for those deliciously twisted revenge-plus-romance BL dramas, I usually start at Archive of Our Own (AO3) and Wattpad — both have massive tag systems that make tracking down a 'revenge' or 'dark romance' vibe really simple. On AO3 you can combine tags like 'boys love', 'revenge', 'enemies to lovers', and sort by kudos or bookmarks to find polished longfics. Wattpad skews a bit more young-reader but you can find serialized slow-burn revenge arcs with plenty of drama.
Beyond those, I poke around Tumblr, Reddit communities, and Discord servers where fans share hidden gems and translations. Tumblr often hosts mid-length fics and smaller communities curate lists; Reddit threads (look for BL or yaoi subcommunities) will drop recs with direct links. I always check author notes for content warnings and chapter pacing, and I try to leave kudos or comments if a fic hooked me — it helps the creators. Honestly, tracing down a gorgeously nasty revenge BL feels like treasure hunting, and finding that perfect toxic chemistry never fails to thrill me.