21018093600

artist

virzoeve

character

gaster

sans

invalid

lore

copyright

handplates

undertale

undertale

species

animated skeleton

humanoid

undead

meta

2017

character cipher

detailed

digital media

hi res

intralingual translation

wingdings text

general

alternate universe

amazing background

angry

binder

bindings

bone

bound

detailed background

duo

examination table

floating hands

hands tied

high-angle view

laboratory

lying

lying on table

machine

male

nude

on back

operating table

restraining table

restraints

science

scientific experiment

skeleton

solo focus

text

thin calves

thin legs

thin thighs

torture

watermarked at source

1boy 1girl 2020s 2023 2d 2d_(artwork) animated_skeleton artist_name artist_watermark blue_breasts blue_nipples blue_tongue bottom_sans breasts clothed clothed_male clothing cum cum_on_face digital_media_(artwork) duo ech7474 ectopenis female_sans gaster gaster_(undertale) genderswap genderswap_(mtf) genitals gloves hooded_jacket hoodie jacket licking licking_face licking_penis male male/female monster multiple_views nipples nude off_shoulder orange_penis paizuri penis purple_background rule_63 sans sans_(undertale) sanster seme_gaster sex simple_background skeleton solid_color_background sweater tears top_gaster twitter uke_sans undead undertale undertale_(series) video_game_character video_games watermark white_gloves

2010s 2016 2boys 2d 2d_(artwork) animated_skeleton arms_behind_back artist_name beoteono black_tentacles blue_blush blue_penis blush bodily_fluids bottom_sans buttercupsticks clothed clothing cussing dominant dominant_male drooling duo ectopenis feet_out_of_frame fluids gaster gaster_(undertale) grabbing_another's_chin grabbing_chin grey_background hand_under_chin hands_behind_back male male/male male_focus male_only maledom malesub monster one_eye_closed partially_colored penis precum profanity sans sans_(undertale) sanster seme_gaster simple_background skeleton soul soul_sex submissive submissive_male swearing tentacle tentacle_on_male tentacles tentacles_around_legs tentacles_on_male text top_gaster uke_sans undead undertale undertale_(series) video_games yaoi