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1. Rain by The_Falling_Star

   Fandoms: Undertale (Video Game)  

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

   24 Dec 2025

   Tags

   • No Archive Warnings Apply
   • W. D. Gaster/Original Character(s)
   • W. D. Gaster
   • POV W. D. Gaster
   • Scientist W. D. Gaster
   • Dom W. D. Gaster
   • Size Difference
   • Dom/sub
   • Office Sex
   • Blow Jobs
   • First Time Blow Jobs
   • Light Bondage
   • Ecto-Penis (Undertale)
   • Vaginal Sex
   • Quiet Sex
   • Clothed Sex
   • Soul Bond
   • Established Relationship
   • Age Difference

   Summary

   Doctor Gaster believes his girlfriend may be going mad.

   The typically reserved girl makes an unexpected appearance at his lab one evening, wearing a revealing ensemble and a sultry smirk. Given his past transgressions, he knows he should resist temptation.

   But he has always been selfish. He always takes what shouldn’t be his. How could he possibly say no when she so willingly offers?

   Series

   • Part 10 of A call, a withering echo, and it sings all-knowing words

   Language:

   English

   Words:

   5,885

   Chapters:

   1/1

   Comments:

   6

   Kudos:

   5

   Hits:

   74