If you're hunting for the richest, most varied gender transformation reads, I head straight to Archive of Our Own and treat it like a treasure map. AO3's tagging system is incredibly deep — you can chain tags like 'gender transformation', 'female-to-male', 'male-to-female', 'gender bender', and add warnings for non-consensual themes or explicit content so you don't get blindsided. I often sort by bookmarks or kudos to find pieces that other readers loved, and I follow collections and series to binge whole arcs when an author nails the concept. The fandom sections are great if you like seeing how a character you already know reacts to a body swap or reassignment scenario.
FanFiction.net still has a surprising amount of older classics in the gender-bender space, and Royal Road carries some original webserials that treat transformation as a central, often fantastical, plot mechanic. Wattpad is a casual mine of modern, romance-leaning takes and is more accessible for discovering new writers who are experimenting. If you're leaning toward more adult-oriented or erotic transformation stories, Literotica has a massive archive organized by themes and user ratings — just be careful with content tags and warnings. I also bookmark Tumblr tag blogs and curated threads where people share hidden gems; those are perfect for one-off recommendations.
My practical search habit: pick a platform, use specific tags, then filter by popularity and language. Read the notes and author's warnings first — it's a cultural thing in these communities to flag sensitive content. Join a couple of Discord or Reddit threads to get quick recs from people who share your taste. Whenever I find an author whose pace and tone I enjoy, I subscribe or follow so I get updates; some authors serialize arcs like novels, and it feels great waiting for the next chapter. Honestly, I love how creative the genre gets — sometimes it’s silly and fun, sometimes it’s thoughtful and transformative in the emotional sense too, and that variety keeps me hooked.