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1. An Equal & Opposite Reaction by yaoipilledblmaxxer for tkrisex

   Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)  

   • Explicit
   • No Archive Warnings Apply
   • M/M
   • Complete Work

   06 Jul 2026

   Tags

   • No Archive Warnings Apply
   • Kamishiro Rui/Tenma Tsukasa
   • Kamishiro Rui
   • Tenma Tsukasa
   • Akiyama Mizuki
   • Mentioned Aoyagi Touya
   • Mentioned Shinonome Akito
   • Mentioned Tenma Saki
   • Bottom Kamishiro Rui
   • Top Tenma Tsukasa
   • Bottom Kamishiro Rui/Top Tenma Tsukasa
   • Trans Male Character
   • Trans Kamishiro Rui
   • Tenma Tsukasa is Trying His Best
   • Tenma Tsukasa is Bad at Feelings
   • Tenma Tsukasa is Down Bad
   • Kamishiro Rui is Down Bad
   • but its less obvious at first
   • Tenma Tsukasa-centric
   • Unreliable Narrator
   • at first
   • Mild Kink
   • very mild
   • Fantasizing
   • Teasing
   • Making Out
   • Hand Jobs
   • Blow Jobs
   • Face-Fucking
   • Come Swallowing
   • Lingerie
   • Nipple Play
   • Nipple Licking
   • Coming Out
   • briefly because rui got ahead of himself
   • Marking
   • Vaginal Sex
   • Creampie
   • Squirting and Vaginal Ejaculation
   • Breeding Kink
   • very briefly mentioned - Freeform

   Summary

   When Tsukasa is reminded there's an upcoming physics exam that's crept up on him for the whole semester, he takes the chance to study with Rui after school after he's promised a thorough refresher. He gets more than he bargained for.

   Rewrite of an old fic and also a birthday gift for my wife since we bonded over said fic.

   Language:

   English

   Words:

   14,481

   Chapters:

   1/1

   Comments:

   23

   Kudos:

   119

   Bookmarks:

   6

   Hits:

   1,959