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gaster

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
ai_generated bald bald_female big_breasts big_smile black_coat breasts cracked_skin cracks creepy creepy_smile curvy female female fully_clothed gaster looking_at_viewer monochrome no_color pixai rule_63 rule_63 scientist simple_background solo staring_at_viewer undertale undertale_(series) up_close upper_body white_pupils white_sweater
ai_generated bald bald_female big_breasts big_smile black_coat breasts cracked_skin cracks creepy creepy_smile curvy female female fully_clothed gaster looking_at_viewer monochrome no_color pixai rule_63 rule_63 scientist simple_background solo staring_at_viewer undertale undertale_(series) up_close upper_body white_pupils white_sweater
blue_eyes bra breasts cat_ears cat_tail catgirl gaster gaster_follower_1_(undertale) gluecu gray_background green_body monster_girl naked_female scared_donut_guy
blue_eyes bra breasts cat_ears cat_tail catgirl gaster gaster_follower_1_(undertale) gluecu gray_background green_body monster_girl naked_female scared_donut_guy
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 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 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 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 undertale undertale_(series) undyne undyne_(underswap) wrestling_outfit
1boy 1girls ambiguous_penetration cum cum_inside enigi09 female_frisk frisk gaster highres impregnation male/female male_penetrating male_penetrating_female ovum pleasure_without_expression tagme undertale undertale_(series)
1boy 1girls ambiguous_penetration cum cum_inside enigi09 female_frisk frisk gaster highres impregnation male/female male_penetrating male_penetrating_female ovum pleasure_without_expression tagme undertale undertale_(series)
ass_jiggle ass_shake bed big_areola big_ass big_balls big_breasts big_cock big_penis big_thighs blush breeding climax cock_hungry cum cum_in_pussy cum_inside ectopenis edit edited edited_art frisk frisky_69 gaster glitchtale grabbing grabbing_ass heavy_balls huge_balls huge_breasts huge_cock impregnation in_love large_ass large_breasts large_penis large_thighs lying_down lying_on_back lying_on_bed massive_ass massive_butt on_top orgasm reverse_cowgirl_position satisfied shaking_ass shaking_butt squeezing_butt thick_ass thick_thighs tongue_out twerking twerking_on_dick undertale undertale_(series) undertale_fanfiction vaginal_penetration vaginal_sex veiny_penis wanting_more
ass_jiggle ass_shake bed big_areola big_ass big_balls big_breasts big_cock big_penis big_thighs blush breeding climax cock_hungry cum cum_in_pussy cum_inside ectopenis edit edited edited_art frisk frisky_69 gaster glitchtale grabbing grabbing_ass heavy_balls huge_balls huge_breasts huge_cock impregnation in_love large_ass large_breasts large_penis large_thighs lying_down lying_on_back lying_on_bed massive_ass massive_butt on_top orgasm reverse_cowgirl_position satisfied shaking_ass shaking_butt squeezing_butt thick_ass thick_thighs tongue_out twerking twerking_on_dick undertale undertale_(series) undertale_fanfiction vaginal_penetration vaginal_sex veiny_penis wanting_more
ai_generated black_and_white black_cloak cracks cracks_in_body creepy creepy_face creepy_smile female gaster horror monochrome naked naked_female nude pixai rule_63 rule_63 slim slim_girl slim_waist small_breasts solo spooky undertale undertale_(series) white_skin
ai_generated black_and_white black_cloak cracks cracks_in_body creepy creepy_face creepy_smile female gaster horror monochrome naked naked_female nude pixai rule_63 rule_63 slim slim_girl slim_waist small_breasts solo spooky undertale undertale_(series) white_skin
1boy 2d boner_in_pants bonez bulge gaster male male_only put2littlemore solo tagme tentacle undertale undertale_(series)
1boy 2d boner_in_pants bonez bulge gaster male male_only put2littlemore solo tagme tentacle undertale undertale_(series)
bald ball_play balls blonde_hair clothed clothing duo facial_markings gaster 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 penetration penis pubes sex shirt smile solo topwear undershirt undertale undertale_(series) white_body
bald ball_play balls blonde_hair clothed clothing duo facial_markings gaster 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 penetration penis pubes sex shirt smile solo topwear undershirt undertale undertale_(series) white_body
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
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
2d alphys anthro belly big_belly digested gaster humanoid implied_digestion lizard_girl lizard_humanoid multi_arm multi_limb questionable reptile reptile_humanoid soft_vore undernom undertale undertale_(series) vore
2d alphys anthro belly big_belly digested gaster humanoid implied_digestion lizard_girl lizard_humanoid multi_arm multi_limb questionable reptile reptile_humanoid soft_vore undernom undertale undertale_(series) vore
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
ass_jiggle ass_shake bed big_areola big_ass big_balls big_breasts big_cock big_penis big_thighs blush ectopenis edit edited edited_art female_frisk frisk frisky_69 gaster glitchtale grabbing grabbing_ass heavy_balls huge_balls huge_breasts huge_cock large_ass large_breasts large_penis large_thighs lying_down lying_on_back lying_on_bed massive_ass massive_butt on_top precum reverse_cowgirl_position shaking_ass shaking_butt squeezing_butt thick_ass thick_thighs tongue_out twerking twerking_on_dick undertale undertale_(series) undertale_fanfiction vaginal_penetration vaginal_sex veiny_penis
ass_jiggle ass_shake bed big_areola big_ass big_balls big_breasts big_cock big_penis big_thighs blush ectopenis edit edited edited_art female_frisk frisk frisky_69 gaster glitchtale grabbing grabbing_ass heavy_balls huge_balls huge_breasts huge_cock large_ass large_breasts large_penis large_thighs lying_down lying_on_back lying_on_bed massive_ass massive_butt on_top precum reverse_cowgirl_position shaking_ass shaking_butt squeezing_butt thick_ass thick_thighs tongue_out twerking twerking_on_dick undertale undertale_(series) undertale_fanfiction vaginal_penetration vaginal_sex veiny_penis
ai_generated bald breasts breasts_out coat coat_only creepy creepy_smile dark_room eye_socket gaster looking_at_viewer medium_breasts melting monochrome monster monster_girl nipples no_pupils pixai shadows smile smiling undertale undertale_(series) up_close upper_body white_skin
ai_generated bald breasts breasts_out coat coat_only creepy creepy_smile dark_room eye_socket gaster looking_at_viewer medium_breasts melting monochrome monster monster_girl nipples no_pupils pixai shadows smile smiling undertale undertale_(series) up_close upper_body white_skin