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1boy 1boy1girl 1girls frisk gaster tagme undertale
1boy 1boy1girl 1girls frisk gaster tagme undertale
1boy 2d ambiguous_gender color dialogue english english_dialogue english_text gaster grillby salt-ankles_(artist) tagme text uncensored undertale undertale_(series)
1boy 2d ambiguous_gender color dialogue english english_dialogue english_text gaster grillby salt-ankles_(artist) tagme text uncensored undertale undertale_(series)
1boy 2d ass big_ass big_butt bubble_ass bubble_butt color femboy gaster huge_ass huge_butt male_only roccorox solo solo_male tagme undertale undertale_(series)
1boy 2d ass big_ass big_butt bubble_ass bubble_butt color femboy gaster huge_ass huge_butt male_only roccorox solo solo_male tagme undertale undertale_(series)
absurd_res bald black_body bodily_fluids clothed clothing curved_penis facial_markings gaster genitals glistening glistening_body glistening_genitalia head_markings hi_res high-angle_view hole_in_hand holes_in_body humanoid kogito male male_only markings monotone_background partially_clothed penis shirt simple_background smile solo tapering_penis topwear undershirt undertale undertale_(series) white_background white_body
absurd_res bald black_body bodily_fluids clothed clothing curved_penis facial_markings gaster genitals glistening glistening_body glistening_genitalia head_markings hi_res high-angle_view hole_in_hand holes_in_body humanoid kogito male male_only markings monotone_background partially_clothed penis shirt simple_background smile solo tapering_penis topwear undershirt undertale undertale_(series) white_background white_body
absurd_res alligator alligatorid alphys alphys_(underswap) ambiguous_gender anthro arachnid armor arthropod asgore_(underswap) asgore_dreemurr asriel_dreemurr big_penis bone boss_monster_(undertale) bratty_(undertale) canid canine carol_holiday cast catty_(undertale) clothing crocodile crocodilian crocodylid deer deltarune dess_holiday digital_media_(artwork) dracozhilla dummy_(undertale) felid female femboy fire fish gaster genitals ghost grillby grillby_(underswap) group happstablook hi_res humanoid larger_female larger_male lingerie machine mad_mew_mew male mammal marine mettaton mew_mew_(undertale) mew_mew_kissy_cutie milffet muffet muffet_(underswap) napstablook napstabot new_world_deer overweight papyrus papyrus_(underswap) penis pixel_(artwork) reindeer reptile river_person_(undertale) robot robot_humanoid sans_(disambiguation) sans_(underswap) scalie scared_donut_guy short shyren size_difference skeleton skinny small_penis spider spirit swimwear tall toriel toriel_(underswap) training_dummy underswap underswap_toriel undertale undertale_(series) undyne undyne_(underswap) wrestling_outfit
absurd_res alligator alligatorid alphys alphys_(underswap) ambiguous_gender anthro arachnid armor arthropod asgore_(underswap) asgore_dreemurr asriel_dreemurr big_penis bone boss_monster_(undertale) bratty_(undertale) canid canine carol_holiday cast catty_(undertale) clothing crocodile crocodilian crocodylid deer deltarune dess_holiday digital_media_(artwork) dracozhilla dummy_(undertale) felid female femboy fire fish gaster genitals ghost grillby grillby_(underswap) group happstablook hi_res humanoid larger_female larger_male lingerie machine mad_mew_mew male mammal marine mettaton mew_mew_(undertale) mew_mew_kissy_cutie milffet muffet muffet_(underswap) napstablook napstabot new_world_deer overweight papyrus papyrus_(underswap) penis pixel_(artwork) reindeer reptile river_person_(undertale) robot robot_humanoid sans_(disambiguation) sans_(underswap) scalie scared_donut_guy short shyren size_difference skeleton skinny small_penis spider spirit swimwear tall toriel toriel_(underswap) training_dummy underswap underswap_toriel undertale undertale_(series) undyne undyne_(underswap) wrestling_outfit
1boy 1girls anus ass barefoot big_breasts blood blush bondage bound breasts busty canime cannibalism curvy cut_open dat_ass feast feet female female_frisk fork frisk gag gagged gaster guro human imminent_death knife legs_up male monochrome nipples nude nudity pussy roast skeleton tied_up undertale unknown_artist vulva
1boy 1girls anus ass barefoot big_breasts blood blush bondage bound breasts busty canime cannibalism curvy cut_open dat_ass feast feet female female_frisk fork frisk gag gagged gaster guro human imminent_death knife legs_up male monochrome nipples nude nudity pussy roast skeleton tied_up undertale unknown_artist vulva
1monster 2d anal_sex animated ass balls confused cum cum_in_ass cum_in_mouth cum_inside cum_on_body cum_on_face cumming dick ejaculation_between_breasts erection fellatio from_behind from_behind_position gaster gay gif licking male_only multiple_males penetration pervert skeleton stuck_in_wall sucking through_wall undertale undertale_(series)
1monster 2d anal_sex animated ass balls confused cum cum_in_ass cum_in_mouth cum_inside cum_on_body cum_on_face cumming dick ejaculation_between_breasts erection fellatio from_behind from_behind_position gaster gay gif licking male_only multiple_males penetration pervert skeleton stuck_in_wall sucking through_wall undertale undertale_(series)
2boys anal animated_skeleton black_blood blush bone g-clone gaster goo heart male male_only naked nightmare_fuel nude questionable_consent sans skeleton slimy spooky suit sweat tears text undertale video_games what white_background yaoi
2boys anal animated_skeleton black_blood blush bone g-clone gaster goo heart male male_only naked nightmare_fuel nude questionable_consent sans skeleton slimy spooky suit sweat tears text undertale video_games what white_background yaoi
2boys 2d big_butt blowjob bubble_butt femboy frisk gaster gay human humanoid male male_only rifray round_ass sex tagme thick_thighs undertale undertale_(series) yaoi
2boys 2d big_butt blowjob bubble_butt femboy frisk gaster gay human humanoid male male_only rifray round_ass sex tagme thick_thighs undertale undertale_(series) yaoi
1:1 gaster lizheru male male_only masturbation penis solo undertale video_games
1:1 gaster lizheru male male_only masturbation penis solo undertale video_games
2d anthro anthro_penetrating asgore_dreemurr big_dom_small_sub bigger_dom bigger_dom_smaller_sub black_and_white boss_monster climax furry gaster gay gay_sex goat horn horns larger_penetrating larger_penetrating_smaller lying male male_only male_penetrated male_penetrating male_penetrating_male missionary missionary_position monster muscle muscles muscular muscular_male naked nude on_back orgasm penetration screaming sex size_difference smaller_penetrated smaller_sub sweat undertale undertale_(series) video_games yaoi
2d anthro anthro_penetrating asgore_dreemurr big_dom_small_sub bigger_dom bigger_dom_smaller_sub black_and_white boss_monster climax furry gaster gay gay_sex goat horn horns larger_penetrating larger_penetrating_smaller lying male male_only male_penetrated male_penetrating male_penetrating_male missionary missionary_position monster muscle muscles muscular muscular_male naked nude on_back orgasm penetration screaming sex size_difference smaller_penetrated smaller_sub sweat undertale undertale_(series) video_games yaoi
1girls 2d awooga_skele-boobs big_ass big_breasts big_butt blush boots breast_grab breasts dtlg_queen dusttale dusttale_last_genocide dusttale_sans edit female female_only gaster mostly_nude partially_clothed pixel_art pose purple_eyes rule_63 sans shoulder_pads skeleton skeleton_girl solo thick_thighs undertale undertale_(series) unknown_artist
1girls 2d awooga_skele-boobs big_ass big_breasts big_butt blush boots breast_grab breasts dtlg_queen dusttale dusttale_last_genocide dusttale_sans edit female female_only gaster mostly_nude partially_clothed pixel_art pose purple_eyes rule_63 sans shoulder_pads skeleton skeleton_girl solo thick_thighs undertale undertale_(series) unknown_artist
2d animated breasts dtlg_queen dusttale_last_genocide edit gaster sans thighs undertale undertale_(series) unknown_artist
2d animated breasts dtlg_queen dusttale_last_genocide edit gaster sans thighs undertale undertale_(series) unknown_artist
anal anal_sex anthro anthro_penetrating asgore_dreemurr blush boss_monster cum cum_in_ass cum_while_penetrated face_markings gaster gay gay_sex glowing_penis male male/male male_only male_penetrating_male monster naked nude purple_blush purple_penis sex undertale video_games yaoi
anal anal_sex anthro anthro_penetrating asgore_dreemurr blush boss_monster cum cum_in_ass cum_while_penetrated face_markings gaster gay gay_sex glowing_penis male male/male male_only male_penetrating_male monster naked nude purple_blush purple_penis sex undertale video_games yaoi
2boys anal anal_sex animal_penis biting clothed_male_nude_male deltarune deltarune_chapter_2 gaster gay humanoid male male/male male_only male_penetrating_male spamton_g_spamton yaoi
2boys anal anal_sex animal_penis biting clothed_male_nude_male deltarune deltarune_chapter_2 gaster gay humanoid male male/male male_only male_penetrating_male spamton_g_spamton yaoi
2d 2d_(artwork) big_ass big_breasts big_hips big_thighs floating_hands gaster genderswap_(mtf) huge_breasts huge_butt huge_hips huge_thighs long_hair loogi_black rule_63 shiny skeleton undertale undertale_(series)
2d 2d_(artwork) big_ass big_breasts big_hips big_thighs floating_hands gaster genderswap_(mtf) huge_breasts huge_butt huge_hips huge_thighs long_hair loogi_black rule_63 shiny skeleton undertale undertale_(series)
2boys 2d big_butt bubble_butt feet femboy frisk gaster gay human humanoid male male_only penis_size_difference rifray round_ass sex spread_anus tagme undertale undertale_(series) yaoi
2boys 2d big_butt bubble_butt feet femboy frisk gaster gay human humanoid male male_only penis_size_difference rifray round_ass sex spread_anus tagme undertale undertale_(series) yaoi
1boy 2d ass big_ass big_butt bubble_ass bubble_butt color fat_ass femboy gaster male male_only slobendy solo tagme undertale undertale_(series)
1boy 2d ass big_ass big_butt bubble_ass bubble_butt color fat_ass femboy gaster male male_only slobendy solo tagme undertale undertale_(series)
2d ahe_gao anal anal_penetration color female gaster penetration salt-ankles_(artist) tagme tongue_out uncensored undertale undertale_(series)
2d ahe_gao anal anal_penetration color female gaster penetration salt-ankles_(artist) tagme tongue_out uncensored undertale undertale_(series)
brothers gaster incest papyrus purple_penis sans tagme tagme_(artist) undertail undertale
brothers gaster incest papyrus purple_penis sans tagme tagme_(artist) undertail undertale
1boy 2d anthro asgore_dreemurr bigger_male color female gaster genderswap_(mtf) kneeling_male larger_anthro larger_male male muscular muscular_male penis penis_between_legs penis_between_thighs rule_63 salt-ankles_(artist) size_difference smaller_female tagme uncensored undertale undertale_(series) white_background white_body
1boy 2d anthro asgore_dreemurr bigger_male color female gaster genderswap_(mtf) kneeling_male larger_anthro larger_male male muscular muscular_male penis penis_between_legs penis_between_thighs rule_63 salt-ankles_(artist) size_difference smaller_female tagme uncensored undertale undertale_(series) white_background white_body
ambiguous_gender anal anal_sex anus ass balls cum cum_inside erection gaster group group_sex male male_penetrated marine monster onionsan open_mouth penetration penis sex smile teeth tentacle tongue undertale video_games water
ambiguous_gender anal anal_sex anus ass balls cum cum_inside erection gaster group group_sex male male_penetrated marine monster onionsan open_mouth penetration penis sex smile teeth tentacle tongue undertale video_games water
animated_skeleton blue_eyes blue_tongue bone chair clothing computer duo fellatio gaster gay hand_on_head hi_res humanoid humanoid_penis incest keyboard licking_penis lizheru lizherubones male male_only oral penis sans skeleton sucking_penis tongue undead undertale video_games yaoi
animated_skeleton blue_eyes blue_tongue bone chair clothing computer duo fellatio gaster gay hand_on_head hi_res humanoid humanoid_penis incest keyboard licking_penis lizheru lizherubones male male_only oral penis sans skeleton sucking_penis tongue undead undertale video_games yaoi
absurd_res anthro arino armwear asriel_dreemurr baseball_cap baseball_uniform big_penis blush boss_monster_(undertale) bottomwear brick_wall choker clothing clothing_pull collaboration collar crop_top deer deltarune dess_holiday digital_media_(artwork) digital_painting_(artwork) dominant dominant_female dracozhilla duo embarrassed everyman female femboy gaster genitals graffiti gynomorph hair hat headgear headwear hi_res humanoid humiliation intersex jewelry larger_male looking_away male male/female mammal midriff necklace new_world_deer pants penis penis_humiliation plant ponytail poster reindeer shirt size_difference small_penis small_penis_humiliation smaller_female sportswear sunrise sunset sweatpants topwear tree undertale undertale_(series) uniform wall_(structure)
absurd_res anthro arino armwear asriel_dreemurr baseball_cap baseball_uniform big_penis blush boss_monster_(undertale) bottomwear brick_wall choker clothing clothing_pull collaboration collar crop_top deer deltarune dess_holiday digital_media_(artwork) digital_painting_(artwork) dominant dominant_female dracozhilla duo embarrassed everyman female femboy gaster genitals graffiti gynomorph hair hat headgear headwear hi_res humanoid humiliation intersex jewelry larger_male looking_away male male/female mammal midriff necklace new_world_deer pants penis penis_humiliation plant ponytail poster reindeer shirt size_difference small_penis small_penis_humiliation smaller_female sportswear sunrise sunset sweatpants topwear tree undertale undertale_(series) uniform wall_(structure)
abs ai_generated anus ass balls bara biceps big_balls big_penis flexing fuckboy gaster gay ilovementits male male_only muscular nipples pecs penis skeleton teasing thighs undertale undertale_(series) yaoi
abs ai_generated anus ass balls bara biceps big_balls big_penis flexing fuckboy gaster gay ilovementits male male_only muscular nipples pecs penis skeleton teasing thighs undertale undertale_(series) yaoi
<3_necklace 5:4 absurd_res alphys anthro ass black_sclera blush bodily_fluids bottomless bottomwear bra breasts buckteeth butt_grab cleavage clothed clothing coat colored_nails duo english_text eyewear female front_view fully_clothed gaster genitals glasses green_eyes hand_on_butt heart hi_res humanoid humanoid_on_anthro jewelry lab_coat leg_grab lizard looking_aside looking_at_another looking_at_partner makeup male male/female mascara medium_breasts nails narrowed_eyes navel necklace nervous non-mammal_breasts open_clothing open_coat open_mouth open_smile open_topwear pants pastrydog pussy reptile rolled_up_sleeves scales scalie signature simple_background skimpy smile sweat teeth text thick_thighs thigh_grab topwear turtleneck undertale underwear video_games wavy_mouth white_body white_eyes white_skin wide_hips yellow_body yellow_scales
<3_necklace 5:4 absurd_res alphys anthro ass black_sclera blush bodily_fluids bottomless bottomwear bra breasts buckteeth butt_grab cleavage clothed clothing coat colored_nails duo english_text eyewear female front_view fully_clothed gaster genitals glasses green_eyes hand_on_butt heart hi_res humanoid humanoid_on_anthro jewelry lab_coat leg_grab lizard looking_aside looking_at_another looking_at_partner makeup male male/female mascara medium_breasts nails narrowed_eyes navel necklace nervous non-mammal_breasts open_clothing open_coat open_mouth open_smile open_topwear pants pastrydog pussy reptile rolled_up_sleeves scales scalie signature simple_background skimpy smile sweat teeth text thick_thighs thigh_grab topwear turtleneck undertale underwear video_games wavy_mouth white_body white_eyes white_skin wide_hips yellow_body yellow_scales
black_background dark_background ectobody female female_sans gaster glasses ink_sans ink_sans_(fan_character) inktale naked nude nude_female rainbow_body rainbow_tongue rectangular_glasses sans sans_au skeleton tagme tongue undertail undertale undertale_au underverse
black_background dark_background ectobody female female_sans gaster glasses ink_sans ink_sans_(fan_character) inktale naked nude nude_female rainbow_body rainbow_tongue rectangular_glasses sans sans_au skeleton tagme tongue undertail undertale undertale_au underverse
bra breasts bunny bunny_ears bunnysuit deltarune dress female fishnets five_nights_at_freddy's five_nights_at_freddy's:_security_breach gaster high_heels lopunny monochrome multiple_girls oc original_character pierump pokémon_(species) pokemon pokemon_(species) pussy rabbit rabbit_ears round_breasts sketch sketch_page sonic_(series) sonic_the_hedgehog spamton_g_spamton tape_over_nipples vanny_(fnaf)
bra breasts bunny bunny_ears bunnysuit deltarune dress female fishnets five_nights_at_freddy's five_nights_at_freddy's:_security_breach gaster high_heels lopunny monochrome multiple_girls oc original_character pierump pokémon_(species) pokemon pokemon_(species) pussy rabbit rabbit_ears round_breasts sketch sketch_page sonic_(series) sonic_the_hedgehog spamton_g_spamton tape_over_nipples vanny_(fnaf)
breasts chara clickertale crossover female gaster looking_at_viewer nipples presenting_hindquarters pubic_hair pussy red_eyes tagme tagme_(character) undertale
breasts chara clickertale crossover female gaster looking_at_viewer nipples presenting_hindquarters pubic_hair pussy red_eyes tagme tagme_(character) undertale
bald black_body bodily_fluids clothed clothing facial_markings gaster genitals glistening glistening_body glistening_genitalia head_markings hi_res hole_in_hand holes_in_body humanoid kogito male male_only markings partially_clothed penis prehensile_penis shirt smile solo topwear undershirt undertale undertale_(series) white_body
bald black_body bodily_fluids clothed clothing facial_markings gaster genitals glistening glistening_body glistening_genitalia head_markings hi_res hole_in_hand holes_in_body humanoid kogito male male_only markings partially_clothed penis prehensile_penis shirt smile solo topwear undershirt undertale undertale_(series) white_body
ahe_gao blue_tongue blush crying_with_eyes_open disembodied_hand disembodied_hands dominant_pov english_text fangs gaster hands_behind_head male male_only moan pleasure_face pov sans solo_focus text tongue tongue_out undertale
ahe_gao blue_tongue blush crying_with_eyes_open disembodied_hand disembodied_hands dominant_pov english_text fangs gaster hands_behind_head male male_only moan pleasure_face pov sans solo_focus text tongue tongue_out undertale
1girls gaster rule_63 smiling_at_viewer tagme tentacle thick undertale
1girls gaster rule_63 smiling_at_viewer tagme tentacle thick undertale
blue_eyes bra breasts cat_ears cat_tail catgirl gaster gaster_follower_1_(undertale) gluecu gray_background green_body monster_girl naked_female rule_63 scared_donut_guy undertale undertale_(series) undertale_fanfiction
blue_eyes bra breasts cat_ears cat_tail catgirl gaster gaster_follower_1_(undertale) gluecu gray_background green_body monster_girl naked_female rule_63 scared_donut_guy undertale undertale_(series) undertale_fanfiction
2d ambiguous_gender femboy gaster huge_ass penetration penetration_bulge rule_63 salt-ankles_(artist) stomach_bulge tagme thick_thighs undertale undertale_(series)
2d ambiguous_gender femboy gaster huge_ass penetration penetration_bulge rule_63 salt-ankles_(artist) stomach_bulge tagme thick_thighs undertale undertale_(series)
2d color cum_in_pussy disembodied_penis female gaster salt-ankles_(artist) tagme uncensored undertale undertale_(series)
2d color cum_in_pussy disembodied_penis female gaster salt-ankles_(artist) tagme uncensored undertale undertale_(series)
black_sclera blush clothed clothed_sex clothing crossover cum cum_in_mouth cum_inside cum_splatter darkner deltarune disembodied_hand drooling duo erection fellatio gaster gloves holding_tail humanoid imp jevil_(deltarune) kuruko male male_only oral orgasm penis questionable_consent saliva sex simple_background tentacle tentacle_in_mouth tentacles_everywhere undertale video_games white_background yaoi
black_sclera blush clothed clothed_sex clothing crossover cum cum_in_mouth cum_inside cum_splatter darkner deltarune disembodied_hand drooling duo erection fellatio gaster gloves holding_tail humanoid imp jevil_(deltarune) kuruko male male_only oral orgasm penis questionable_consent saliva sex simple_background tentacle tentacle_in_mouth tentacles_everywhere undertale video_games white_background yaoi