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Summary: In probably the weirdest and kinkiest part of what is already the all-time weirdest and kinkiest thing (besides Alphamalg, anyway) to ever hit the Undertale fandom, Asriel and Muffet shrink themselves to small bug size and go inside Alphys' and Toriel's brains (respectively, of course) through their ear canals in order to take control over their bodies so that the two of them can have the foot orgy of a lifetime with Asgore and Undyne!

Oh, and in Alphys' case, there's also a lot of extremely graphic female foot-domination and vore involved in the process leading up to Asriel (very painfully) breaking into her head and ultimately taking mind control over her, so of course there's also that as well XD
Rated: X
Categories: Giantess, Teenager (13-19), Adventure, Breasts, BBW, Body Exploration, Middle Age (50+), Couples, Crush, Destruction, Entrapment, Fantasy, Feet, Furry, Futanari, Humiliation, Incest, Insertion, Instant Size Change, Lesbians, Maternal, Mouth Play, Odor, Unaware, Violent, Vore, Watersports Characters: None
Growth: None
Shrink: Micro (1 in. to 1/2 in.), Minikin (3 in. to 1 in.)
Size Roles: F/f, F/m, FM/f
Warnings: Following story may contain inappropriate material for certain audiences, This story is for entertainment purposes only.
Challenges: None
Series: None
Chapters: 1 Completed: Yes
Word count: 6367 Read: 6880
Published: November 23 2016 Updated: November 23 2016
Story Notes:
The video game Undertale and all of its respective characters and settings belong exclusively to Toby Fox and his affiliates. This is a non-profit fanwork with no intention of infringing on said copyright.

1. Underfoot Fetishtale (Chapters 5-6) by xandermartin98 [Reviews - 0] (6367 words)