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1boy animated_skeleton blue_blush blush blushing bottomless disembodied_hand disembodied_hands egg_vibrator floating_hands gay heart laying_on_bed lying_on_bed male male_focus no_genitals non-human sans sex_toy shirt_lift shirt_up skeleton solo_focus undertail undertale undertale_(series) undertale_sans vibrator
1boy animated_skeleton blue_blush blush blushing bottomless disembodied_hand disembodied_hands egg_vibrator floating_hands gay heart laying_on_bed lying_on_bed male male_focus no_genitals non-human sans sex_toy shirt_lift shirt_up skeleton solo_focus undertail undertale undertale_(series) undertale_sans vibrator
animated_skeleton blue_blush blush blushing bone bottomless eli-sin-g english_text flower flowey_the_flower gay kolesjoie legs_apart legs_spread male male_only mouth_forced_open plant sans simple_background skeleton spread_legs tentacle tentacle_around_leg tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_wrists tentacles_in_mouth tentacles_under_clothes text undertail undertale undertale_(series) undertale_sans vine_tentacles vines white_background
animated_skeleton blue_blush blush blushing bone bottomless eli-sin-g english_text flower flowey_the_flower gay kolesjoie legs_apart legs_spread male male_only mouth_forced_open plant sans simple_background skeleton spread_legs tentacle tentacle_around_leg tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_wrists tentacles_in_mouth tentacles_under_clothes text undertail undertale undertale_(series) undertale_sans vine_tentacles vines white_background
1boy 2021 ahe_gao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing chubby chubby_male clothed crying cum cum_on_face cumming ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_only monster on_bed one_eye_closed penis sans shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling undead undertail undertale undertale_(series) undertale_sans veiny_penis
1boy 2021 ahe_gao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing chubby chubby_male clothed crying cum cum_on_face cumming ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_only monster on_bed one_eye_closed penis sans shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling undead undertail undertale undertale_(series) undertale_sans veiny_penis
2boys big_dom_small_sub bigger_dom blue_blush blue_penis blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only orange_blush pants_only papyrus penis penis_grab sans shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2boys big_dom_small_sub bigger_dom blue_blush blue_penis blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only orange_blush pants_only papyrus penis penis_grab sans shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2010s 2018 animated_skeleton blue_blush blush blushing fallen9choirs gay looking_at_viewer male red_penis saliva saliva_trail sans simple_background skeleton tagme undertail undertale undertale_(series) undertale_sans white_background
2010s 2018 animated_skeleton blue_blush blush blushing fallen9choirs gay looking_at_viewer male red_penis saliva saliva_trail sans simple_background skeleton tagme undertail undertale undertale_(series) undertale_sans white_background
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1boy animated_skeleton blue_blush blue_penis blush blushing bodily_fluids bodily_fluids_on_penis ectopenis hands_over_head laying_down looking_at_own_penis lying_down male male_only nervous penis precum precum_drip precum_on_penis sans shirt_up skeleton solo solo_male sweat tagme undertail undertale undertale_(series) undertale_sans
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!! animated_skeleton blue_blush blue_tongue blush blushing bottomless cropped crying drooling ectopenis ectoplasm english_text erect_penis exclamation_mark exclamation_point fangs immolationyyx incest male male_only male_out_of_frame male_penetrating monster non-con non-consensual noncon nonconsensual orange_penis out_of_frame papyrus papyrus_(undertale) penetration penis pleading sans sans_(undertale) sex shirt_only shirt_up skeleton sweat tears text text_bubble tongue trembling undead undertail undertale undertale_(series) undertale_sans unseen_male unseen_male_face veiny_penis white_background
!! animated_skeleton blue_blush blue_tongue blush blushing bottomless cropped crying drooling ectopenis ectoplasm english_text erect_penis exclamation_mark exclamation_point fangs immolationyyx incest male male_only male_out_of_frame male_penetrating monster non-con non-consensual noncon nonconsensual orange_penis out_of_frame papyrus papyrus_(undertale) penetration penis pleading sans sans_(undertale) sex shirt_only shirt_up skeleton sweat tears text text_bubble tongue trembling undead undertail undertale undertale_(series) undertale_sans unseen_male unseen_male_face veiny_penis white_background
bound_wrists kustard male_only sans sans_au sanscest singingsans_(artist) soul_sex underfell underfell_sans undertale undertale_au undertale_sans
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1boy animated_skeleton blue_blush blue_penis blush blushing bottomless bound_wrists ectopenis jacket jpeg_artifacts male male_only nsfwgarbagedump_(artist) panting penis sans simple_background skeleton solo solo_male tied_up tied_wrists undertail undertale undertale_(series) undertale_sans white_background
1boy animated_skeleton blue_blush blue_penis blush blushing bottomless bound_wrists ectopenis jacket jpeg_artifacts male male_only nsfwgarbagedump_(artist) panting penis sans simple_background skeleton solo solo_male tied_up tied_wrists undertail undertale undertale_(series) undertale_sans white_background
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animated_skeleton blue_blush blue_penis blue_tongue blush blushing bonely_hearts_club clothed clothing ectopenis grabbing_own_penis lightsaber_dick looking_at_viewer male male_only masturbation one_eye_closed penis sans serfuzzy skeleton solo solo_male tagme transparent_background undertail undertale undertale_(series) undertale_sans
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1boy anal anal_insertion anal_sex animal_dildo animal_sex_toy animated_skeleton anterior_nasal_aperture anus ass balls bedroom_eyes big_butt black_bottomwear black_clothing black_pants black_sclera blue_anus blue_clothing blue_eyes blue_hoodie blue_nipples blue_topwear bodily_fluids bone bottomless bottomwear bubble_butt bulge butt_squish clothed clothing crouching cum cum_drip cum_in_ass cum_inside dialogue dildo dildo_in_ass dildo_penetration dripping english_text equine_dildo fangs fully_clothed gaping gaping_anus gay genital_fluids genitals glistening_body gloves glowing glowing_anus glowing_genitalia glowing_penis glowing_tongue hands_behind_head handwear hi_res hoodie hoodie_only humanoid kneeling legwear lightsaber_dick looking_at_viewer looking_back male male_only meme mkcrown musclegut muscular muscular_male narrowed_eyes nipples one_eye_closed pants pecs penetration penis perineum presenting presenting_anus presenting_hindquarters presenting_penis pupils sans seductive sex_toy sex_toy_in_ass sex_toy_penetration simple_background six_fanarts_challenge skeleton slippers solo solo_male squish teeth testicles text thick_thighs thigh_highs tongue tongue_out topless topwear topwear_only undead undertale undertale_sans underwear vein veiny_penis video_games white_body white_pupils
1boy anal anal_insertion anal_sex animal_dildo animal_sex_toy animated_skeleton anterior_nasal_aperture anus ass balls bedroom_eyes big_butt black_bottomwear black_clothing black_pants black_sclera blue_anus blue_clothing blue_eyes blue_hoodie blue_nipples blue_topwear bodily_fluids bone bottomless bottomwear bubble_butt bulge butt_squish clothed clothing crouching cum cum_drip cum_in_ass cum_inside dialogue dildo dildo_in_ass dildo_penetration dripping english_text equine_dildo fangs fully_clothed gaping gaping_anus gay genital_fluids genitals glistening_body gloves glowing glowing_anus glowing_genitalia glowing_penis glowing_tongue hands_behind_head handwear hi_res hoodie hoodie_only humanoid kneeling legwear lightsaber_dick looking_at_viewer looking_back male male_only meme mkcrown musclegut muscular muscular_male narrowed_eyes nipples one_eye_closed pants pecs penetration penis perineum presenting presenting_anus presenting_hindquarters presenting_penis pupils sans seductive sex_toy sex_toy_in_ass sex_toy_penetration simple_background six_fanarts_challenge skeleton slippers solo solo_male squish teeth testicles text thick_thighs thigh_highs tongue tongue_out topless topwear topwear_only undead undertale undertale_sans underwear vein veiny_penis video_games white_body white_pupils
2020 5_fingers absurd_res all_fours animated_skeleton anterior_nasal_aperture anthro anthro_penetrating asriel_dreemurr asriel_dreemurr_(god_form) ass blue_clothing blue_glans blue_hoodie blue_penis blue_topwear bodily_fluids bone boss_monster bottomless bottomwear bovid briefs butt_grab caprine clothed clothes_on_floor clothing cum cum_on_back cum_on_body detailed_background dialogue doggy_style duo english_text erection fingers from_behind_position gay genital_fluids genitals glans glistening_body god_of_hyperdeath grin hand_on_butt hi_res hoodie horn hot_dogging humanoid humanoid_genitalia humanoid_penis male male/male male_only mammal mkcrown naked nipples nude on_bed penis penis_on_ass profanity pubes sans sex shorts simple_background skeleton smile teeth text text_bubble tighty_whities topwear undead undertale undertale_(series) undertale_sans underwear vein veiny_penis video_games white_body white_clothing white_fur white_underwear yaoi
2020 5_fingers absurd_res all_fours animated_skeleton anterior_nasal_aperture anthro anthro_penetrating asriel_dreemurr asriel_dreemurr_(god_form) ass blue_clothing blue_glans blue_hoodie blue_penis blue_topwear bodily_fluids bone boss_monster bottomless bottomwear bovid briefs butt_grab caprine clothed clothes_on_floor clothing cum cum_on_back cum_on_body detailed_background dialogue doggy_style duo english_text erection fingers from_behind_position gay genital_fluids genitals glans glistening_body god_of_hyperdeath grin hand_on_butt hi_res hoodie horn hot_dogging humanoid humanoid_genitalia humanoid_penis male male/male male_only mammal mkcrown naked nipples nude on_bed penis penis_on_ass profanity pubes sans sex shorts simple_background skeleton smile teeth text text_bubble tighty_whities topwear undead undertale undertale_(series) undertale_sans underwear vein veiny_penis video_games white_body white_clothing white_fur white_underwear yaoi
2boys 5_fingers absurd_res anal anal_penetration anal_sex animated_skeleton anterior_nasal_aperture anthro anthro_penetrating anthro_penetrating_humanoid asgore_dreemurr ball_tuft balls bara big_balls big_penis big_testicles black_sclera blonde_hair blue_penis bodily_fluids bone boss_monster bottomless bovid caprine chair chair_position clothed clothed/nude clothing cum cum_in_ass cum_inside dialogue duo english_text fingers from_behind_position furniture gay gay_sex genital_fluids genitals grabbing_own_penis hand_on_knee hand_on_leg hand_on_penis hand_on_side hi_res hoodie horn humanoid humanoid_on_anthro humanoid_penetrated inside looking_at_another looking_pleasured male male/male male_only male_penetrated male_penetrating male_penetrating_male mammal mkcrown naked nude one_eye_closed onomatopoeia partially_clothed penetration penis penis_in_ass pubes sans sex sex_noises size_difference skeleton sound_effects speech_bubble sweat teeth testicles text text_bubble topwear tuft undead undertale undertale_sans vein veiny_penis video_games white_body
2boys 5_fingers absurd_res anal anal_penetration anal_sex animated_skeleton anterior_nasal_aperture anthro anthro_penetrating anthro_penetrating_humanoid asgore_dreemurr ball_tuft balls bara big_balls big_penis big_testicles black_sclera blonde_hair blue_penis bodily_fluids bone boss_monster bottomless bovid caprine chair chair_position clothed clothed/nude clothing cum cum_in_ass cum_inside dialogue duo english_text fingers from_behind_position furniture gay gay_sex genital_fluids genitals grabbing_own_penis hand_on_knee hand_on_leg hand_on_penis hand_on_side hi_res hoodie horn humanoid humanoid_on_anthro humanoid_penetrated inside looking_at_another looking_pleasured male male/male male_only male_penetrated male_penetrating male_penetrating_male mammal mkcrown naked nude one_eye_closed onomatopoeia partially_clothed penetration penis penis_in_ass pubes sans sex sex_noises size_difference skeleton sound_effects speech_bubble sweat teeth testicles text text_bubble topwear tuft undead undertale undertale_sans vein veiny_penis video_games white_body
2020 anal andromorph andromorph/male andromorph_penetrated big_ass big_butt bubble_ass bubble_butt covering_mouth cuntboy fat_ass fat_butt gay gay_sex glory_hole gloryhole grillby intersex intersex/male intersex_penetrated male male/male pounding sans skullcrysto tagme text thick_ass thick_butt through_wall undertale undertale_fanfiction undertale_sans yaoi
2020 anal andromorph andromorph/male andromorph_penetrated big_ass big_butt bubble_ass bubble_butt covering_mouth cuntboy fat_ass fat_butt gay gay_sex glory_hole gloryhole grillby intersex intersex/male intersex_penetrated male male/male pounding sans skullcrysto tagme text thick_ass thick_butt through_wall undertale undertale_fanfiction undertale_sans yaoi
1girls 2019 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins female gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1girls 2019 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins female gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
2019 3boys black_hoodie blowjob blue_blush blue_eyes blue_hoodie blue_penis blue_tongue bodily_fluids cum cum_in_mouth cum_on_tongue fellatio gay genital_fluids hands_in_pockets heart hearts hoodie humanoid_penis lizheru lizherubones male male/male penis red_penis sans sanscest selfcest skeleton square_crossover star-shaped_pupils starry_eyes text underfell underfell_sans underswap underswap_sans undertale undertale_fanfiction undertale_sans video_games
2019 3boys black_hoodie blowjob blue_blush blue_eyes blue_hoodie blue_penis blue_tongue bodily_fluids cum cum_in_mouth cum_on_tongue fellatio gay genital_fluids hands_in_pockets heart hearts hoodie humanoid_penis lizheru lizherubones male male/male penis red_penis sans sanscest selfcest skeleton square_crossover star-shaped_pupils starry_eyes text underfell underfell_sans underswap underswap_sans undertale undertale_fanfiction undertale_sans video_games
ahe_gao anal anal_penetration anal_sex animated_skeleton balls bara big_ass big_belly bigger_penetrating bigger_penetrating_smaller blue_blush blue_glans blue_penis blush bone bouncing_penis clothed clothing cum cum_in_ass cum_inside cum_while_penetrated dark_background duo faceless_male gay gay_sex gradient_background half_nude hi_res hoodie human human_on_humanoid human_penetrating human_penetrating_humanoid humanoid humanoid_penetrated interspecies legs_apart legs_spread male male/male male_only male_penetrated male_penetrating mammal mkcrown moan moaning onomatopoeia orgasm penetration penis sans simple_background size_difference skeleton slippers smaller_penetrated socks spread_legs testicles thick_thighs undead undertail undertale undertale_sans unknown_male unseen_male_face video_games white_body yaoi
ahe_gao anal anal_penetration anal_sex animated_skeleton balls bara big_ass big_belly bigger_penetrating bigger_penetrating_smaller blue_blush blue_glans blue_penis blush bone bouncing_penis clothed clothing cum cum_in_ass cum_inside cum_while_penetrated dark_background duo faceless_male gay gay_sex gradient_background half_nude hi_res hoodie human human_on_humanoid human_penetrating human_penetrating_humanoid humanoid humanoid_penetrated interspecies legs_apart legs_spread male male/male male_only male_penetrated male_penetrating mammal mkcrown moan moaning onomatopoeia orgasm penetration penis sans simple_background size_difference skeleton slippers smaller_penetrated socks spread_legs testicles thick_thighs undead undertail undertale undertale_sans unknown_male unseen_male_face video_games white_body yaoi
blue_body collar cuntboy ectobody ectopenis ectopussy elysiansins glowing_penis glowing_pussy intersex kustard legs_up male naked nude penetration red_body rule_63 sans sans_(underfell) sans_au sanscest simple_background spiked_collar underfell underfell_sans underfoot undertale undertale_au undertale_fanfiction undertale_sans vaginal vaginal_penetration vaginal_sex
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1boy 1cuntboy 2018 black_sclera blue_blush blue_pussy blush cuntboy cuntboy_on_male ectopenis ectopussy imsinfull intersex intersex_on_male male papyrus_au penetration penis pussy red_blush red_eyes red_penis sans sex skeleton underfell underfell_papyrus undertale undertale_fanfiction undertale_sans vaginal vaginal_penetration
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1boy 2016 blue_blush blue_eyes blue_penis blush blushing doiduh ectopenis male male_only masturbation on_bed penis sans sitting sitting_on_bed skeleton solo solo_male undertail undertale undertale_sans
1boy 2016 blue_blush blue_eyes blue_penis blush blushing doiduh ectopenis male male_only masturbation on_bed penis sans sitting sitting_on_bed skeleton solo solo_male undertail undertale undertale_sans
2017 3boys anal_tail animal_ears animal_tail artist_request ass backsack balls blue_blush blue_body blue_hoodie blush bunny_boy bunny_ears bunny_humanoid bunny_tail butt buttplug cat_boy cat_ears cat_humanoid cat_tail catboy ectobody gray_fur grey_fur looking_back looking_behind male male_only pink_fur presenting rabbit_ears rabbit_tail rainbow_background red_blush red_body red_hoodie sans sans_au sex_toy tail tail_wrapped_around_balls testicles trio underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans white_fur wolf_boy wolf_ears wolf_humanoid wolf_tail
2017 3boys anal_tail animal_ears animal_tail artist_request ass backsack balls blue_blush blue_body blue_hoodie blush bunny_boy bunny_ears bunny_humanoid bunny_tail butt buttplug cat_boy cat_ears cat_humanoid cat_tail catboy ectobody gray_fur grey_fur looking_back looking_behind male male_only pink_fur presenting rabbit_ears rabbit_tail rainbow_background red_blush red_body red_hoodie sans sans_au sex_toy tail tail_wrapped_around_balls testicles trio underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans white_fur wolf_boy wolf_ears wolf_humanoid wolf_tail
2016 blush bone clothed clothed_sex clothing colored_cum cum cum_on_face cum_on_hand cum_on_tongue english_text glowing glowing_eyes heart implied_incest incest nsfwshamecave sans sans_au sex skeleton tagme text tongue tongue_out undead underfell underfell_sans underlust underlust_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans unusual_cum
2016 blush bone clothed clothed_sex clothing colored_cum cum cum_on_face cum_on_hand cum_on_tongue english_text glowing glowing_eyes heart implied_incest incest nsfwshamecave sans sans_au sex skeleton tagme text tongue tongue_out undead underfell underfell_sans underlust underlust_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans unusual_cum
2016 2boys blush bone brothers comic duo_focus english_text frottage gay incest male male_only masturbation monster papyrus penis penis_rubbing rubbing sans sex sibling skeleton text underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_papyrus undertale_sans unseen_character yaoi
2016 2boys blush bone brothers comic duo_focus english_text frottage gay incest male male_only masturbation monster papyrus penis penis_rubbing rubbing sans sex sibling skeleton text underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_papyrus undertale_sans unseen_character yaoi
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