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1girls 2d chara female gaster heart heart-shaped_pupils human leg_up lucaisarts mind_break rough_sex sex tagme tentacle_rape thighhighs undertale undertale_(series)
1girls 2d chara female gaster heart heart-shaped_pupils human leg_up lucaisarts mind_break rough_sex sex tagme tentacle_rape thighhighs undertale undertale_(series)
1girls 2d chara female female_only gaster heart heart-shaped_pupils humanoid leg_up lucaisarts mind_break rough_sex sex tagme tentacle_rape thighhighs undertale undertale_(series)
1girls 2d chara female female_only gaster heart heart-shaped_pupils humanoid leg_up lucaisarts mind_break rough_sex sex tagme tentacle_rape thighhighs undertale undertale_(series)
1boy 1girls 2d chara clothed_rape female gaster human humanoid lucaisarts male rape red_eyes self_upload sex simple_background strangling tagme tentacle tentacle_rape trusting undertale undertale_(series)
1boy 1girls 2d chara clothed_rape female gaster human humanoid lucaisarts male rape red_eyes self_upload sex simple_background strangling tagme tentacle tentacle_rape trusting 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)
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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
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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
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2boys 2d big_butt bubble_butt feet femboy frisk gaster gay humanoid male male_only penis_size_difference penises_touching rifray round_ass 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
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2boys 2d big_butt cum cum_in_ass cum_inside cum_while_penetrated enigi09 femboy frisk gaster gay handsfree_ejaculation human humanoid male male_only round_ass sex standing_sex undertale undertale_(series)
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blowjob_face full_nelson gaster gluecu mating_press oc
blowjob_face full_nelson gaster gluecu mating_press oc
1girls 2d female female_only fruitynsfw gaster humanoid sketch solo tagme undertail undertale undertale_(series) undertale_au undertale_fanfiction
1girls 2d female female_only fruitynsfw gaster humanoid sketch solo tagme undertail undertale undertale_(series) undertale_au undertale_fanfiction
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
blowjob canon_x_oc doodle gaster gay gay_pride lipstick lipstick_mark lipstick_on_penis mlm oc ocxcanon original_character sketch slutboy
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2boys anal anal_penetration anal_sex anus asgore_dreemurr balls big_balls big_penis biting_lip blush cum cum_in_ass cum_inside eyes_rolling_back full_nelson full_nelson_anal gaster gay gay_sex gradient_background hand_behind_head heart hearts male male/male male_only male_penetrating_male motion_blur penetration penis purple_body redeyedgazer sex simple_background smiling tagme testicles undertale undertale_(series) white_fur yaoi
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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
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
after_sex all_fours alphys ambiguous_penetration anthro anthro_penetrated bed black_nails bodily_fluids bottomless breasts buckteeth closed_eyes clothed clothing colored_nails drooling duo english_text eye_roll eyewear female female_penetrated from_behind_position furniture gaster glasses heart hip_grab humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro kneeling lizard looking_pleasured lying male male/female male_penetrating male_penetrating_female medium_breasts nails non-mammal_breasts on_back on_side open_mouth open_smile pastrydog penetration penile penile_penetration reptile saliva scales scalie sex side_view signaute simple_background smile sweat teeth text thick_tail thick_thighs three-quarter_view undertale_(series) white_body yellow_body yellow_scales
after_sex all_fours alphys ambiguous_penetration anthro anthro_penetrated bed black_nails bodily_fluids bottomless breasts buckteeth closed_eyes clothed clothing colored_nails drooling duo english_text eye_roll eyewear female female_penetrated from_behind_position furniture gaster glasses heart hip_grab humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro kneeling lizard looking_pleasured lying male male/female male_penetrating male_penetrating_female medium_breasts nails non-mammal_breasts on_back on_side open_mouth open_smile pastrydog penetration penile penile_penetration reptile saliva scales scalie sex side_view signaute simple_background smile sweat teeth text thick_tail thick_thighs three-quarter_view undertale_(series) white_body yellow_body yellow_scales
1girls 2boys anal anal_insertion anal_penetration anal_sex blue_penis bone clothed_sex double_penetration ectopenis female frisk gaster penetration purple_penis sans skeleton spine threesome undertale vaginal vaginal_penetration vaginal_sex
1girls 2boys anal anal_insertion anal_penetration anal_sex blue_penis bone clothed_sex double_penetration ectopenis female frisk gaster penetration purple_penis sans skeleton spine threesome undertale vaginal vaginal_penetration vaginal_sex
1girls anal consensual_tentacles frisk gaster holding_head marmalademum scratches sex tagme tentacles tongue_out undertale vaginal_penetration
1girls anal consensual_tentacles frisk gaster holding_head marmalademum scratches sex tagme tentacles tongue_out undertale vaginal_penetration
anthro asgore_dreemurr bovid caprine chubby chubby_male duo efryol frottage gaster gay genitals goat gradient_background hi_res humanoid kissing making_out male male/male male_only mammal muscular naked nude penis sex slightly_chubby undertale undertale_(series) video_games yaoi
anthro asgore_dreemurr bovid caprine chubby chubby_male duo efryol frottage gaster gay genitals goat gradient_background hi_res humanoid kissing making_out male male/male male_only mammal muscular naked nude penis sex slightly_chubby undertale undertale_(series) video_games yaoi
alternate_universe anthro ass balls bent_over big_balls big_breasts big_butt big_penis blush bodily_fluids bottomless bow_tie breasts clitoris clothed clothing dripping female frisk frisky_(under(her)tail) gaster gaster_follower gaster_follower_1_(undertale) genital_fluids genitals goner_kid group huge_breasts huge_cock human humanoid humanoid_genitalia humanoid_penis kitty_(under(her)tail) leaning leaning_back licking lips lizard long_penis male male/female mammal monster oral penile penis penis_lick precum precum_drip pubes pussy reptile retracted_foreskin rule_63 saliva saliva_on_penis scalie sex surrounded sweat thewill thick_lips thick_penis thick_thighs tongue tongue_out under(her)tail undertale undertale_(series) unknown_species video_games
alternate_universe anthro ass balls bent_over big_balls big_breasts big_butt big_penis blush bodily_fluids bottomless bow_tie breasts clitoris clothed clothing dripping female frisk frisky_(under(her)tail) gaster gaster_follower gaster_follower_1_(undertale) genital_fluids genitals goner_kid group huge_breasts huge_cock human humanoid humanoid_genitalia humanoid_penis kitty_(under(her)tail) leaning leaning_back licking lips lizard long_penis male male/female mammal monster oral penile penis penis_lick precum precum_drip pubes pussy reptile retracted_foreskin rule_63 saliva saliva_on_penis scalie sex surrounded sweat thewill thick_lips thick_penis thick_thighs tongue tongue_out under(her)tail undertale undertale_(series) unknown_species video_games
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
2boys choking disembodied_hand disembodied_hands gaster male male_only restrained sans undertale
2boys choking disembodied_hand disembodied_hands gaster male male_only restrained sans undertale
2boys animated_skeleton blue_penis blush bone bottomless bottomwear clothed clothing comic dialogue duo elephant_trunk english_text gaster genitals grin humanoid humor magpiesins male male_only penis proboscis_(anatomy) sans shirt simple_background skeleton smile teeth text topwear trunk trunk_(anatomy) undead undertale unusual_anatomy unusual_genitalia unusual_penis video_games white_background white_body white_clothing white_shirt white_topwear
2boys animated_skeleton blue_penis blush bone bottomless bottomwear clothed clothing comic dialogue duo elephant_trunk english_text gaster genitals grin humanoid humor magpiesins male male_only penis proboscis_(anatomy) sans shirt simple_background skeleton smile teeth text topwear trunk trunk_(anatomy) undead undertale unusual_anatomy unusual_genitalia unusual_penis video_games white_background white_body white_clothing white_shirt white_topwear
2boys animated_skeleton blue_blush blue_penis blush bone bottomless bottomwear closed_eyes clothed clothing comic dialogue duo elephant_trunk english_text footwear gaster genitals grin hi_res humanoid humor kneeling magpiesins male male_only onomatopoeia penis proboscis_(anatomy) sans shirt shove simple_background skeleton smile socks sound_effects teeth text topwear trunk trunk_(anatomy) undead undertale unusual_anatomy unusual_genitalia unusual_penis video_games white_background white_body white_clothing white_footwear white_shirt white_socks white_topwear wiggle
2boys animated_skeleton blue_blush blue_penis blush bone bottomless bottomwear closed_eyes clothed clothing comic dialogue duo elephant_trunk english_text footwear gaster genitals grin hi_res humanoid humor kneeling magpiesins male male_only onomatopoeia penis proboscis_(anatomy) sans shirt shove simple_background skeleton smile socks sound_effects teeth text topwear trunk trunk_(anatomy) undead undertale unusual_anatomy unusual_genitalia unusual_penis video_games white_background white_body white_clothing white_footwear white_shirt white_socks white_topwear wiggle
blush bones embarrassed fire fire_elemental gaster gay grillby holding_hands male male/male male_only monster partially_clothed shirtless skeleton soul soul_sex succulentgeckos topless undertale yaoi
blush bones embarrassed fire fire_elemental gaster gay grillby holding_hands male male/male male_only monster partially_clothed shirtless skeleton soul soul_sex succulentgeckos topless undertale yaoi
animated_skeleton blush bones fire fire_elemental gaster grillby holding_arm male male/male male_only monster partially_clothed purple_blush shirtless skeleton soul soul_sex succulentgeckos tail temperature_play topless undertale yaoi
animated_skeleton blush bones fire fire_elemental gaster grillby holding_arm male male/male male_only monster partially_clothed purple_blush shirtless skeleton soul soul_sex succulentgeckos tail temperature_play topless undertale yaoi
anthro bat_wings blush claws disembodied_hands ectopenis gaster glowing_eyes glowing_penis male male/male male_only monster pawpads size_difference skeleton succulentgeckos tail undertale yaoi
anthro bat_wings blush claws disembodied_hands ectopenis gaster glowing_eyes glowing_penis male male/male male_only monster pawpads size_difference skeleton succulentgeckos tail undertale yaoi
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
brothers gaster incest papyrus purple_penis sans tagme tagme_(artist) undertail undertale
brothers gaster incest papyrus purple_penis sans tagme tagme_(artist) undertail undertale
ahoge artist_name barcode blush censored frisk gaster golden_eyes partially_clothed pleasure_face spread_legs spread_pussy undertale
ahoge artist_name barcode blush censored frisk gaster golden_eyes partially_clothed pleasure_face spread_legs spread_pussy undertale
<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
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