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1. The Colour of Observation by Pikapeppa

   Fandoms: One Piece (Anime & Manga)  

   • Explicit
   • No Archive Warnings Apply
   • F/M, M/M, Multi
   • Work in Progress

   28 Jan 2026

   Tags

   • No Archive Warnings Apply
   • Roronoa Zoro/Sanji/Reader
   • Roronoa Zoro/Reader
   • Roronoa Zoro/Sanji
   • Sanji (One Piece)/Reader
   • Roronoa Zoro
   • Sanji (One Piece)
   • Reader
   • Threesome - F/M/M
   • Roronoa Zoro and Sanji Bickering
   • Smut
   • Established relationship Roronoa Zoro/Reader
   • Some very minor blood play thanks to Sanji's nosebleeds and Zoro being a freak (AFFECTIONATE)
   • No Use of Y/N for Reader-Insert
   • Cis Female Reader-Insert
   • No Pregnancy

   Summary

   You’ve been with the Straw Hat Crew for two weeks now, and you’ve been hard at work learning observation haki from Sanji. When Zoro notices that you’re becoming attracted to Sanji, he responds by sitting in on your haki training sessions, much to Sanji’s displeasure.

   And then he suggests a threesome.

   ***********
   In sum: a post-Wano spinoff of my Zoro/Reader series, where Sanji gets into a little poly arrangement with you and Zoro. No M/M action in the first chapter, but there will be in Chap 2 and 3. 😌

   Series

   • Part 4 of Adventures with Zoro's Fourth Sword

   Language:

   English

   Words:

   24,403

   Chapters:

   2/3

   Comments:

   11

   Kudos:

   30

   Bookmarks:

   4

   Hits:

   523