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1. A little Eggstra by rehliamonster

   Fandoms: Undertale (Video Game)  

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

   23 Jul 2018

   Tags

   • No Archive Warnings Apply
   • Sans (Undertale)/Reader
   • Sans (Undertale)
   • Reader
   • Oviposition
   • Mating Cycles/In Heat
   • Knotting
   • Accidental Knotting
   • Egg Laying
   • Eggpreg
   • Come Inflation
   • Mildly Dubious Consent
   • Enthusiastic Consent
   • Begging
   • Praise Kink
   • Miscommunication
   • Ectobiology
   • Weird Biology
   • Reader-Insert
   • Easter Eggs
   • Easterposition
   • Unexpected Pregnancy
   • Egg Hell
   • egg pregnancy
   • preggnancy
   • reader is a bit of an airhead
   • due to sexual hormones Sans isn't much better tbh
   • we had the preggening
   • now get ready for the eggening
   • inaccurate birth
   • Multiple Orgasms
   • Overstimulation
   • Hand Jobs
   • Massage
   • Mutual Masturbation

   Summary

   You're appalled when you find that Sans has been hiding from you during his heat. Why didn't he come to you instead? He's your boyfriend, and you partially watched a documentary about monster heats, so you're practically an expert and ready to help him out!

   Right?

   Now with a followup chapter!

   Language:

   English

   Words:

   10,086

   Chapters:

   2/2

   Comments:

   186

   Kudos:

   1,943

   Bookmarks:

   254

   Hits:

   50,704