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1girls 3boys bad_to_the_bone bete_noire big_ass big_breasts gaster glitchtale glowing_eyes goes_hard huge_ass huge_breasts humiliation hyper karmatic karmatic_(artist) meme papyrus pointing_soyjak rape sans soyjak undertale undertale_(series) undertale_au
1girls 3boys bad_to_the_bone bete_noire big_ass big_breasts gaster glitchtale glowing_eyes goes_hard huge_ass huge_breasts humiliation hyper karmatic karmatic_(artist) meme papyrus pointing_soyjak rape sans soyjak undertale undertale_(series) undertale_au
anthro artist_request blue_penis facial_scar gaster glowing_penis holding_penis male male_only penis scar skeleton smile smirk solo sweater tagme turtleneck undertale
anthro artist_request blue_penis facial_scar gaster glowing_penis holding_penis male male_only penis scar skeleton smile smirk solo sweater tagme turtleneck undertale
2boys anal androgynous android artist_request blush dialogue duo forced gaster high_heel_boots interspecies looking_back machine male male_only mettaton mettaton_ex penis rape restrained robot robot_humanoid sex speech_bubble tagme tentacle tentacle_rape undertale yaoi
2boys anal androgynous android artist_request blush dialogue duo forced gaster high_heel_boots interspecies looking_back machine male male_only mettaton mettaton_ex penis rape restrained robot robot_humanoid sex speech_bubble tagme tentacle tentacle_rape undertale yaoi
alphys animated_skeleton anthro anthro_penetrated anus ass beaker blush bone breasts butt_grab clothed clothing coat duo erection eyewear eyewear_only female gaster glasses glasses_only hand_on_butt humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro lab_coat laboratory_equipment laboratory_glassware lizard male male/female male_penetrating_anthro nude penetration penile penile_penetration penis_in_pussy reptile scalie scientific_instrument sex size_difference skeleton small_breasts tinybeasts toony topwear undead undertale undertale_(series) vaginal_penetration vaginal_penetration video_games
alphys animated_skeleton anthro anthro_penetrated anus ass beaker blush bone breasts butt_grab clothed clothing coat duo erection eyewear eyewear_only female gaster glasses glasses_only hand_on_butt humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro lab_coat laboratory_equipment laboratory_glassware lizard male male/female male_penetrating_anthro nude penetration penile penile_penetration penis_in_pussy reptile scalie scientific_instrument sex size_difference skeleton small_breasts tinybeasts toony topwear undead undertale undertale_(series) vaginal_penetration vaginal_penetration video_games
1:1 absurd_res alphys anthro anus ass big_butt black_eyes blush bodily_fluids bottomless butt_grab chair choker clothed clothing clothing_aside clothing_pull colored_nails delta_rune_(emblem) duo empty_eyes english_text erection female footwear furniture gaster genitals green_eyes hand_on_butt hand_on_face hi_res huge_butt huge_hips humanoid humanoid_genitalia humanoid_on_anthro humanoid_penis jewelry kneeling lizard looking_at_another looking_at_partner makeup male male/female mascara mew_mew_(undertale) mew_mew_kissy_cutie nails necklace nervous on_lap open_mouth open_smile panties panties_aside panty_pull partially_(disambiguation) pastrydog penis pussy reptile rolled_up_shirt scales scalie shirt signature simple_background smile socks suntan sweat symbol tan_line text thick_thighs topwear turtleneck undertale underwear underwear_aside underwear_pull video_games wavy_mouth white_body white_skin wide_hips yellow_body yellow_scales
1:1 absurd_res alphys anthro anus ass big_butt black_eyes blush bodily_fluids bottomless butt_grab chair choker clothed clothing clothing_aside clothing_pull colored_nails delta_rune_(emblem) duo empty_eyes english_text erection female footwear furniture gaster genitals green_eyes hand_on_butt hand_on_face hi_res huge_butt huge_hips humanoid humanoid_genitalia humanoid_on_anthro humanoid_penis jewelry kneeling lizard looking_at_another looking_at_partner makeup male male/female mascara mew_mew_(undertale) mew_mew_kissy_cutie nails necklace nervous on_lap open_mouth open_smile panties panties_aside panty_pull partially_(disambiguation) pastrydog penis pussy reptile rolled_up_shirt scales scalie shirt signature simple_background smile socks suntan sweat symbol tan_line text thick_thighs topwear turtleneck undertale underwear underwear_aside underwear_pull video_games wavy_mouth white_body white_skin wide_hips yellow_body yellow_scales
ass big_ass big_butt blush bubble_ass bubble_butt butt_up fat_ass fat_butt gaster hugging_pillow laying_on_stomach male_only muscular on_bed redeyedgazer round_ass round_butt shirtless smiling thick_ass thick_butt thick_thighs topless undertale underwear
ass big_ass big_butt blush bubble_ass bubble_butt butt_up fat_ass fat_butt gaster hugging_pillow laying_on_stomach male_only muscular on_bed redeyedgazer round_ass round_butt shirtless smiling thick_ass thick_butt thick_thighs topless undertale underwear
1boy ass big_ass big_butt black_clothing black_eyes bubble_ass bubble_butt fat_ass fat_butt gaster gasteritis huge_ass huge_butt looking_at_viewer looking_back male male_only massive_ass massive_butt plump_ass solo thick_ass undertale undertale_(series) undertale_au white_body white_pupils white_skin
1boy ass big_ass big_butt black_clothing black_eyes bubble_ass bubble_butt fat_ass fat_butt gaster gasteritis huge_ass huge_butt looking_at_viewer looking_back male male_only massive_ass massive_butt plump_ass solo thick_ass undertale undertale_(series) undertale_au white_body white_pupils white_skin
1boy 1girls anon anonymous anonymous_female anthro artist_request ass ball balls big_ass big_penis blush bone boner bones clavicle cock daddy dick drool drooling english_text erect_penis erection gaster grey_background grey_body grey_shirt grey_skin heart hearts_around_head huff huge_ass huge_cock lace lace_panties male_focus male_penetrating neck panting pants penis pink_underwear purple_blush shirt skeleton striped_clothing sweat sweatdrop sweatdrops sweating text undertale undertale_(series) vein veins veiny veiny_penis white_body white_shirt white_skin
1boy 1girls anon anonymous anonymous_female anthro artist_request ass ball balls big_ass big_penis blush bone boner bones clavicle cock daddy dick drool drooling english_text erect_penis erection gaster grey_background grey_body grey_shirt grey_skin heart hearts_around_head huff huge_ass huge_cock lace lace_panties male_focus male_penetrating neck panting pants penis pink_underwear purple_blush shirt skeleton striped_clothing sweat sweatdrop sweatdrops sweating text undertale undertale_(series) vein veins veiny veiny_penis white_body white_shirt white_skin
6_arms anal anon anonym avian bird bone cum cum_in_ass cum_in_pussy cum_inside double duck gaster glowing helaviskrew mmf monster muffet napstablook neon papyrus penetration penis pussy sans science skeleton undertale vaginal_penetration
6_arms anal anon anonym avian bird bone cum cum_in_ass cum_in_pussy cum_inside double duck gaster glowing helaviskrew mmf monster muffet napstablook neon papyrus penetration penis pussy sans science skeleton undertale vaginal_penetration
1boy 2d ambiguous_gender ambiguous_penetration color gaster grillby male orange_body penetration rule_63 salt-ankles_(artist) tagme undertale undertale_(series) white_background white_body
1boy 2d ambiguous_gender ambiguous_penetration color gaster grillby male orange_body penetration rule_63 salt-ankles_(artist) tagme undertale undertale_(series) white_background white_body
1boy 1girls 2boys 2d 2girls blowjob condom female frisk gaster gaster_follower_1_(undertale) gluecu gray_body human humanoid male paizuri scared_donut_guy sex tagme titjob undertale undertale_(series)
1boy 1girls 2boys 2d 2girls blowjob condom female frisk gaster gaster_follower_1_(undertale) gluecu gray_body human humanoid male paizuri scared_donut_guy sex tagme titjob undertale undertale_(series)
2boys 2d blush femboy frisk frisk_(undertale) full_body gaster gay human humanoid male male_frisk male_only nude_male penis rifray tagme undertale undertale_(series) yaoi
2boys 2d blush femboy frisk frisk_(undertale) full_body gaster gay human humanoid male male_frisk male_only nude_male penis rifray tagme undertale undertale_(series) yaoi
black_background blush deltarune deltarune_chapter_2 gaster gay male male/male mostly_clothed noncon nonconsensual shy size_difference spamton_g_spamton spotlight white_body yaoi
black_background blush deltarune deltarune_chapter_2 gaster gay male male/male mostly_clothed noncon nonconsensual shy size_difference spamton_g_spamton spotlight white_body yaoi
ambiguous_gender big_breasts black black_sweater breasts fangs gaster gasteritis grabbing_own_breast gray_tongue lab_coat labcoat rule_63 sharp_teeth skeleton sweater tongue tongue_out undertale undertale_au undertale_fanfiction
ambiguous_gender big_breasts black black_sweater breasts fangs gaster gasteritis grabbing_own_breast gray_tongue lab_coat labcoat rule_63 sharp_teeth skeleton sweater tongue tongue_out undertale undertale_au undertale_fanfiction
1:1 3boys animated_skeleton big_penis blush blushing bodily_fluids bone cock collaborative_handjob cum cum_on_face cum_on_penis cumming cumshot dick gaster gay gay_sex genital_fluids group handjob huge_cock humanoid humanoid_penis incest licking lizheru lizherubones male male/male male/male/male male_focus male_only masturbating masturbation oral oral_sex papyrus penile penis penis_lick sans semi_incest sex skeleton skeletons smile tongue tongue_out undead undertale vein veiny_penis video_games yaoi
1:1 3boys animated_skeleton big_penis blush blushing bodily_fluids bone cock collaborative_handjob cum cum_on_face cum_on_penis cumming cumshot dick gaster gay gay_sex genital_fluids group handjob huge_cock humanoid humanoid_penis incest licking lizheru lizherubones male male/male male/male/male male_focus male_only masturbating masturbation oral oral_sex papyrus penile penis penis_lick sans semi_incest sex skeleton skeletons smile tongue tongue_out undead undertale vein veiny_penis video_games yaoi
2boys 2d blush cum cum_in_ass cum_inside cumshot enigi09 femboy frisk gaster gay hi_res sex tagme tongue_out undertale undertale_(series)
2boys 2d blush cum cum_in_ass cum_inside cumshot enigi09 femboy frisk gaster gay hi_res sex tagme tongue_out undertale undertale_(series)
blush breasts elemental female fire fire_elemental fuku_fire gaster glowing halloween large_breasts male moon mouthless night nipples nude outdoors papyrus pumpkin pussy redbenjamin solo_focus tree undertale wide_hips
blush breasts elemental female fire fire_elemental fuku_fire gaster glowing halloween large_breasts male moon mouthless night nipples nude outdoors papyrus pumpkin pussy redbenjamin solo_focus tree undertale wide_hips
brother gaster gay group group_sex incest papyrus purple_penis sans tagme tagme_(artist) threesome undertail undertale
brother gaster gay group group_sex incest papyrus purple_penis sans tagme tagme_(artist) threesome undertail undertale
2boys animated_skeleton blush brown_hair cum eyes_closed femboy frisk gaster gay girly human male male_frisk male_human male_only mouth_open nude nude_male penis penis_size_difference sitting_on_person skeleton smile undertale undertale_(series) yaoi yellow_body yellow_skin zoober
2boys animated_skeleton blush brown_hair cum eyes_closed femboy frisk gaster gay girly human male male_frisk male_human male_only mouth_open nude nude_male penis penis_size_difference sitting_on_person skeleton smile undertale undertale_(series) yaoi yellow_body yellow_skin zoober
cum gaster lizherubones male male_only masturbation penis solo tongue undertale yaoi
cum gaster lizherubones male male_only masturbation penis solo tongue undertale yaoi
big_belly big_breasts female female_only frisk gaster hyper hyper_breasts jelly moldsmal tagme undertale undertale_(series) vore vore_belly wakingslime
big_belly big_breasts female female_only frisk gaster hyper hyper_breasts jelly moldsmal tagme undertale undertale_(series) vore vore_belly wakingslime
1girls 2d bottomless color dialogue english english_dialogue english_text exposed_pussy female female_only gaster grey_background salt-ankles_(artist) simple_background solo tagme text uncensored undertale undertale_(series)
1girls 2d bottomless color dialogue english english_dialogue english_text exposed_pussy female female_only gaster grey_background salt-ankles_(artist) simple_background solo tagme text uncensored undertale undertale_(series)
2boys 2d bulge femboy frisk gaster gay humanoid male male_only rifray ripped_clothing tagme undertale undertale_(series) yaoi
2boys 2d bulge femboy frisk gaster gay humanoid male male_only rifray ripped_clothing tagme undertale undertale_(series) yaoi
1boy 1male 1monster anthro black_clothing black_tentacles clothed clothing coffee cum cumming cumshot cup daddy dick english_text gaster gay gay_sex hand_on_head jerking jerking_off jerkingoff lizheru lizherubones love male male_focus male_only masturbating masturbation penis sex skeleton sofa solo solo_focus solo_male source_request tagme tentacle tentacle_masturbation tentacle_on_male tentacle_sex tentacles text undertale white_skin yaoi
1boy 1male 1monster anthro black_clothing black_tentacles clothed clothing coffee cum cumming cumshot cup daddy dick english_text gaster gay gay_sex hand_on_head jerking jerking_off jerkingoff lizheru lizherubones love male male_focus male_only masturbating masturbation penis sex skeleton sofa solo solo_focus solo_male source_request tagme tentacle tentacle_masturbation tentacle_on_male tentacle_sex tentacles text undertale white_skin yaoi
arms_behind_back artist_logo ass ass_cleavage belly_bigger_than_head belly_bulge belly_expansion big_belly big_breasts blush brown_hair brown_pants butt_crack chara female female_only gaster glowing gray_background green_shirt grey_background growl gurgle hyper knife light_skin onomatopoeia pink_cheeks red_eyes red_glow sfx slosh text text_box text_bubble undertale undertale_(series) vore vore_belly wakingslime
arms_behind_back artist_logo ass ass_cleavage belly_bigger_than_head belly_bulge belly_expansion big_belly big_breasts blush brown_hair brown_pants butt_crack chara female female_only gaster glowing gray_background green_shirt grey_background growl gurgle hyper knife light_skin onomatopoeia pink_cheeks red_eyes red_glow sfx slosh text text_box text_bubble undertale undertale_(series) vore vore_belly wakingslime
1boy 1male big_penis black_background black_eyes black_mouth black_sclera black_shoes blush bone boner bones clothed clothing cock daddy gaster gay gay_sex glowing gray_sweater grey_cardigan grey_socks grey_sweater hi_res highres huge_cock itsr4bb1t male male_focus male_only male_pov original_character penis penis_under_clothes purple_blush purple_penis simple_background skeleton solo solo_focus solo_male stroking stroking_cock stroking_penis undertale undertale_(series) undertale_fanfiction white_body white_coat white_eyes white_panties white_pupils white_skin yaoi
1boy 1male big_penis black_background black_eyes black_mouth black_sclera black_shoes blush bone boner bones clothed clothing cock daddy gaster gay gay_sex glowing gray_sweater grey_cardigan grey_socks grey_sweater hi_res highres huge_cock itsr4bb1t male male_focus male_only male_pov original_character penis penis_under_clothes purple_blush purple_penis simple_background skeleton solo solo_focus solo_male stroking stroking_cock stroking_penis undertale undertale_(series) undertale_fanfiction white_body white_coat white_eyes white_panties white_pupils white_skin yaoi
2d bald bara big_penis black_eyes blush boner bulge color deltarune gaster gay huge_cock male male_only muscular muscular_male penis_bulge redeyedgazer shirtless solo solo_male undertale undertale_(series) underwear white_pupils white_skin
2d bald bara big_penis black_eyes blush boner bulge color deltarune gaster gay huge_cock male male_only muscular muscular_male penis_bulge redeyedgazer shirtless solo solo_male undertale undertale_(series) underwear white_pupils white_skin
1boy 1boy1girl 1girls 2d against_wall color female gaster grillby male orange_body penetration rule_63 salt-ankles_(artist) tagme uncensored undertale undertale_(series) white_background white_body
1boy 1boy1girl 1girls 2d against_wall color female gaster grillby male orange_body penetration rule_63 salt-ankles_(artist) tagme uncensored undertale undertale_(series) white_background white_body
asgore_dreemurr bald ball_play balls blonde_hair clothed clothing duo facial_markings gaster gay genitals hair head_markings hi_res hole_in_hand holes_in_body humanoid kogito male male/male male_penetrated male_penetrating male_penetrating_male markings off_screen_character penetration penis pubes sex shirt smile solo topwear undershirt undertale undertale_(series) white_body
asgore_dreemurr bald ball_play balls blonde_hair clothed clothing duo facial_markings gaster gay genitals hair head_markings hi_res hole_in_hand holes_in_body humanoid kogito male male/male male_penetrated male_penetrating male_penetrating_male markings off_screen_character penetration penis pubes sex shirt smile solo topwear undershirt undertale undertale_(series) white_body
3boys blue_tongue blush double_penetration drooling english_text gaster gay male male_only papyrus penetration purple_tongue sans slime slimy_tentacles tentacle text threesome tongue_out undertale wingdings yaoi
3boys blue_tongue blush double_penetration drooling english_text gaster gay male male_only papyrus penetration purple_tongue sans slime slimy_tentacles tentacle text threesome tongue_out undertale wingdings yaoi
2d anthro anthro_penetrating asgore_dreemurr beard big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating_smaller blonde blonde_hair boss_monster closed_eyes clothed clothed_sex clothing color colored dilf facial_hair furry gaster gay gay_sex goat horn horns king larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster muscles muscular muscular_male open_mouth penis sex sitting_on_person size_difference smaller_penetrated smaller_sub throne undertale undertale_(series) video_games white_background white_body white_fur wingdings yaoi
2d anthro anthro_penetrating asgore_dreemurr beard big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating_smaller blonde blonde_hair boss_monster closed_eyes clothed clothed_sex clothing color colored dilf facial_hair furry gaster gay gay_sex goat horn horns king larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster muscles muscular muscular_male open_mouth penis sex sitting_on_person size_difference smaller_penetrated smaller_sub throne undertale undertale_(series) video_games white_background white_body white_fur wingdings yaoi
2023 alphys animated_skeleton anus artist_name ass big_dom_small_sub black_sclera blush bodily_fluids bone bow_underwear breasts butt_grab clothing dialogue digital_media_(artwork) distracted_sex dominant duo emanata english_text eyewear eyewear_on_head fake_cat_ears fake_ears female female_penetrated flat_colors floating_hands footwear footwear_only from_behind_position gaster genitals glasses glasses_on_head gradient_penis green_background hand_on_butt heart hi_res humanoid humanoid_genitalia humanoid_penis kissing leaning_over lizard male male/female male_penetrating male_penetrating_female mew_mew_(undertale) mew_mew_kissy_cutie mostly_nude motion_lines navel one_tooth onomatopoeia penetration penis pink_clothing pink_footwear pink_socks plushie pupils pussy reptile scalie sequence sex simple_background sitting size_difference skeleton slam small_breasts small_tail snaggle_tooth socks socks_only sound_effects spread_legs spreading surprise sweat table_sex tail talking_to_another teebsly television text undead undertale undertale_(series) underwear vaginal_penetration vaginal_penetration white_body white_clothing white_penis white_pupils white_skin white_text white_underwear wingdings yellow_body yellow_skin
2023 alphys animated_skeleton anus artist_name ass big_dom_small_sub black_sclera blush bodily_fluids bone bow_underwear breasts butt_grab clothing dialogue digital_media_(artwork) distracted_sex dominant duo emanata english_text eyewear eyewear_on_head fake_cat_ears fake_ears female female_penetrated flat_colors floating_hands footwear footwear_only from_behind_position gaster genitals glasses glasses_on_head gradient_penis green_background hand_on_butt heart hi_res humanoid humanoid_genitalia humanoid_penis kissing leaning_over lizard male male/female male_penetrating male_penetrating_female mew_mew_(undertale) mew_mew_kissy_cutie mostly_nude motion_lines navel one_tooth onomatopoeia penetration penis pink_clothing pink_footwear pink_socks plushie pupils pussy reptile scalie sequence sex simple_background sitting size_difference skeleton slam small_breasts small_tail snaggle_tooth socks socks_only sound_effects spread_legs spreading surprise sweat table_sex tail talking_to_another teebsly television text undead undertale undertale_(series) underwear vaginal_penetration vaginal_penetration white_body white_clothing white_penis white_pupils white_skin white_text white_underwear wingdings yellow_body yellow_skin
! ... 1:1 anal anal_penetration anal_sex animated_skeleton big_dom_small_sub bigger_dom bigger_penetrating_smaller blue_penis bone clothing duo english_text faceless_male from_behind gaster gay humanoid humanoid_penis implied_incest larger_dom larger_penetrating larger_penetrating_smaller lizheru lizherubones looking_back looking_behind male male/male male_only pants_around_one_leg penetration penis sans sex skeleton smaller_penetrated smaller_sub testicles text text_bubble undead undertale video_games yaoi
! ... 1:1 anal anal_penetration anal_sex animated_skeleton big_dom_small_sub bigger_dom bigger_penetrating_smaller blue_penis bone clothing duo english_text faceless_male from_behind gaster gay humanoid humanoid_penis implied_incest larger_dom larger_penetrating larger_penetrating_smaller lizheru lizherubones looking_back looking_behind male male/male male_only pants_around_one_leg penetration penis sans sex skeleton smaller_penetrated smaller_sub testicles text text_bubble undead undertale video_games yaoi
big_breasts black_body black_skin blush bones boobjob breasts dtlg_queen dusttale_last_genocide female first_person_view flame gaster heart-shaped_pupils male monster_girl nipples paizuri penis penis_between_breasts pov precum rule_63 sans shiny_breasts shoulder_pads skeleton skull titjob undertale_au
big_breasts black_body black_skin blush bones boobjob breasts dtlg_queen dusttale_last_genocide female first_person_view flame gaster heart-shaped_pupils male monster_girl nipples paizuri penis penis_between_breasts pov precum rule_63 sans shiny_breasts shoulder_pads skeleton skull titjob undertale_au
1boy 1boy1girl 1girls frisk gaster tagme undertale
1boy 1boy1girl 1girls frisk gaster tagme undertale
1boy ass big_ass big_butt blush bubble_ass bubble_butt butt_up dat_ass dumptruck_ass dumptruck_butt fat_ass fat_butt gaster hugging_pillow laying_on_stomach lustful_gaze magic_hands male_only muscular on_bed penis purple_body redeyedgazer round_ass round_butt thick_ass thick_butt thick_thighs undertale undertale_(series) underwear_pulled_down
1boy ass big_ass big_butt blush bubble_ass bubble_butt butt_up dat_ass dumptruck_ass dumptruck_butt fat_ass fat_butt gaster hugging_pillow laying_on_stomach lustful_gaze magic_hands male_only muscular on_bed penis purple_body redeyedgazer round_ass round_butt thick_ass thick_butt thick_thighs undertale undertale_(series) underwear_pulled_down