*UPDATE: All ranges of Undertale smut/lemons (mostly lemons by this point) No longer one shot. Contains multiple one-shots, and occasionally two-shots. Male readers can request a character x male reader :) Underfell Sans x Female Reader. Smut or a Lemon *shrugs* might be a one shot (if no one wants more I guess)

Smut one-shot for Undertale characters. Yep, this is happening.