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1. Adventures of Sans and Grown-Up Frisk (+18) by hillybillyz

   Fandoms: Undertale (Video Game)  

   • Mature
   • Creator Chose Not To Use Archive Warnings
   • F/M
   • Work in Progress

   03 Jan 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Frisk/Sans (Undertale)
   • Sans (Undertale)
   • Frisk (Undertale)
   • Papyrus (Undertale)
   • Undyne (Undertale)
   • Alphys (Undertale)
   • Toriel (Undertale)
   • Mettaton (Undertale)
   • Asgore Dreemurr
   • Muffet (Undertale)
   • Flowey (Undertale)
   • Asriel Dreemurr
   • Chara (Undertale)

   Summary

   a compilation of the adventures of adult frisk (F19) and sans! will use some of the original creator's comics for reference or they'll be original oneshots!

   one-shots (even requested ones) can range from wholesome to erotic, but for the sake of it, the book will be rated as (+18) or mature. thank you for understanding... and have a good time~♡

   Language:

   English

   Words:

   6,747

   Chapters:

   4/?

   Comments:

   6

   Kudos:

   6

   Hits:

   135