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1boy 2022 animated_skeleton blue_blush blush blushing boner boner_in_pants drool drooling erection_under_clothes erection_under_pants fingering fingering_self heki_(artist) leaking_through_clothing legs_apart legs_spread looking_down male male_only masturbation one_eye_closed one_eye_open pants_around_legs sans skeleton solo solo_male spread_legs sweat sweatdrop tears tears_of_pleasure undertale undertale_(series) undertale_sans
1boy 2022 animated_skeleton blue_blush blush blushing boner boner_in_pants drool drooling erection_under_clothes erection_under_pants fingering fingering_self heki_(artist) leaking_through_clothing legs_apart legs_spread looking_down male male_only masturbation one_eye_closed one_eye_open pants_around_legs sans skeleton solo solo_male spread_legs sweat sweatdrop tears tears_of_pleasure undertale undertale_(series) undertale_sans
1boy anal anal_sex blue_blush blush censor_bar censored chained drool drooling experiment gay group japanese_text laboratory legs_forced_open legs_held_open logo_(pixiv30462562) male male_only mechanical_tentacles penetration pixiv_id_30462562 restrained robotic_arm robotic_tentacles sans skeleton solo_focus soul_sex sweat sweating tentacle text trapped undertail undertale undertale_(series) undertale_sans watching
1boy anal anal_sex blue_blush blush censor_bar censored chained drool drooling experiment gay group japanese_text laboratory legs_forced_open legs_held_open logo_(pixiv30462562) male male_only mechanical_tentacles penetration pixiv_id_30462562 restrained robotic_arm robotic_tentacles sans skeleton solo_focus soul_sex sweat sweating tentacle text trapped undertail undertale undertale_(series) undertale_sans watching
1boy anal anal_sex animated_skeleton blue_blush blush blushing censor_bar censored crying cuntboy intersex japanese_text logo_(pixiv30462562) male penetration pixiv_id_30462562 rape sans simple_background skeleton soul_sex sweat sweating tears tentacle tentacle_around_arm tentacle_around_leg tentacle_rape tentacle_sex tentacles tentacles_around_arms text trapped undertail undertale undertale_(series) undertale_sans white_background
1boy anal anal_sex animated_skeleton blue_blush blush blushing censor_bar censored crying cuntboy intersex japanese_text logo_(pixiv30462562) male penetration pixiv_id_30462562 rape sans simple_background skeleton soul_sex sweat sweating tears tentacle tentacle_around_arm tentacle_around_leg tentacle_rape tentacle_sex tentacles tentacles_around_arms text trapped undertail undertale undertale_(series) undertale_sans white_background
2boys animated_skeleton big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing crying cum cum_in_pussy cum_inside faceless_male gay grabbing_penis holding_down holding_penis hoodie hoodie_only larger_penetrating larger_penetrating_smaller logo_(pixiv30462562) male male_only penetration pinned_down pixiv_id_30462562 sans skeleton small_sub small_sub_big_dom smaller_penetrated soul_sex sweat sweating tears undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
2boys animated_skeleton big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing crying cum cum_in_pussy cum_inside faceless_male gay grabbing_penis holding_down holding_penis hoodie hoodie_only larger_penetrating larger_penetrating_smaller logo_(pixiv30462562) male male_only penetration pinned_down pixiv_id_30462562 sans skeleton small_sub small_sub_big_dom smaller_penetrated soul_sex sweat sweating tears undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
2boys ablue_blush anal anal_sex animated_skeleton blush blushing closed_eyes crying cum cum_in_pussy cumming dialogue dominant_pov embarrassed faceless_male fucked_from_behind gay grabbing_bedding grabbing_sheets gripping_sheets holding_hips japanese_text logo_(pixiv30462562) male monster on_bed penetrating_pov penetration pixiv_id_30462562 pov sans simple_background skeleton smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears text undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face yaoi
2boys ablue_blush anal anal_sex animated_skeleton blush blushing closed_eyes crying cum cum_in_pussy cumming dialogue dominant_pov embarrassed faceless_male fucked_from_behind gay grabbing_bedding grabbing_sheets gripping_sheets holding_hips japanese_text logo_(pixiv30462562) male monster on_bed penetrating_pov penetration pixiv_id_30462562 pov sans simple_background skeleton smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears text undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face yaoi
1boy 2010s 2016 alkipunch animated_skeleton artist_name autofellatio blowjob blue_blush blue_penis blush blushing bone clothed clothing ectopenis fellatio grabbing_sheets gripping_sheets highres hooded_jacket hoodie jacket male male_only masturbation monster oral penis sans sans_(undertale) self_blowjob self_oral selfsuck skeleton sneakers solo solo_male sucking_own_penis sucking_penis sweat undead undertail undertale undertale_(series) undertale_sans
1boy 2010s 2016 alkipunch animated_skeleton artist_name autofellatio blowjob blue_blush blue_penis blush blushing bone clothed clothing ectopenis fellatio grabbing_sheets gripping_sheets highres hooded_jacket hoodie jacket male male_only masturbation monster oral penis sans sans_(undertale) self_blowjob self_oral selfsuck skeleton sneakers solo solo_male sucking_own_penis sucking_penis sweat undead undertail undertale undertale_(series) undertale_sans
2d bitty blue_blush blush blush_lines blushing embarrassed frostious hand_on_crotch hand_up_shirt male male_only micro micro_male micro_on_macro nervous nervous_sweat one_eye_closed sans sweat sweatdrop sweating sweaty undertale undertale_(series) undertale_sans
2d bitty blue_blush blush blush_lines blushing embarrassed frostious hand_on_crotch hand_up_shirt male male_only micro micro_male micro_on_macro nervous nervous_sweat one_eye_closed sans sweat sweatdrop sweating sweaty undertale undertale_(series) undertale_sans
bound_wrists kustard male_only sans sans_au sanscest singingsans_(artist) soul_sex underfell underfell_sans undertale undertale_au undertale_sans
bound_wrists kustard male_only sans sans_au sanscest singingsans_(artist) soul_sex underfell underfell_sans undertale undertale_au undertale_sans
1boy 2d after_sex blue_body bottomless cum cum_in_ass cum_inside cumflation ectobody inflation kneeling male male_only mellednsfw sans solo sweater tagme undertail undertale undertale_(series) undertale_sans
1boy 2d after_sex blue_body bottomless cum cum_in_ass cum_inside cumflation ectobody inflation kneeling male male_only mellednsfw sans solo sweater tagme undertail undertale undertale_(series) undertale_sans
1boy 2021 ahe_gao animated_skeleton blue_belly blue_blush blue_body blue_dick blue_eyes blue_hoodie blue_jacket blue_penis blue_pupils 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 meta_request monster on_bed one_eye_closed penis sans sans_blush sans_eye sans_glowing_eye sans_penis 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_dick blue_eyes blue_hoodie blue_jacket blue_penis blue_pupils 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 meta_request monster on_bed one_eye_closed penis sans sans_blush sans_eye sans_glowing_eye sans_penis shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling undead undertail undertale undertale_(series) undertale_sans veiny_penis
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
anal anal_sex ass back_view blue_blush blue_body blush bottomless bubble_butt crying cum cum_in_ass cum_inside dat_ass ectobody jacket looking_at_viewer lowres male male_only partially_colored penetrating_pov penetration pov redeyedgazer sans skeleton undertail undertale undertale_(series) undertale_sans white_background
anal anal_sex ass back_view blue_blush blue_body blush bottomless bubble_butt crying cum cum_in_ass cum_inside dat_ass ectobody jacket looking_at_viewer lowres male male_only partially_colored penetrating_pov penetration pov redeyedgazer sans skeleton undertail undertale undertale_(series) undertale_sans 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
!! 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
2boys anthro big_penis black_panties blue_hoodie blue_penis clothed clothing cock coffee cum cumming dick english_text gay golden_tooth huge_cock lizheru lizherubones love male male/male male_focus male_only penis red_penis sans skeleton skeletons source_request teeth teeth_showing text underfell underfell_sans undertale undertale_(series) undertale_au undertale_fanfiction undertale_sans yaoi
2boys anthro big_penis black_panties blue_hoodie blue_penis clothed clothing cock coffee cum cumming dick english_text gay golden_tooth huge_cock lizheru lizherubones love male male/male male_focus male_only penis red_penis sans skeleton skeletons source_request teeth teeth_showing text underfell underfell_sans undertale undertale_(series) undertale_au undertale_fanfiction undertale_sans yaoi
crying_with_eyes_open cum cum_inside cumming drooling orgasm orgasm_face penetrating_pov penetration pov sans sans_(underfell) sans_au sanscest selfcest underfell underfell_sans undertale undertale_au undertale_sans
crying_with_eyes_open cum cum_inside cumming drooling orgasm orgasm_face penetrating_pov penetration pov sans sans_(underfell) sans_au sanscest selfcest underfell underfell_sans undertale undertale_au undertale_sans
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
animated_skeleton blue_blush blue_cum blush censored chained cum cumming drool drooling experiment legs_forced_open legs_held_open logo_(pixiv30462562) on_table penetration pixiv_id_30462562 rape restrained robotic_tentacles sans skeleton soul_sex sweat sweating tears tentacle tentacle_rape tentacles trapped undertail undertale undertale_(series) undertale_sans
animated_skeleton blue_blush blue_cum blush censored chained cum cumming drool drooling experiment legs_forced_open legs_held_open logo_(pixiv30462562) on_table penetration pixiv_id_30462562 rape restrained robotic_tentacles sans skeleton soul_sex sweat sweating tears tentacle tentacle_rape tentacles trapped undertail undertale undertale_(series) undertale_sans
1boy 2018 animated_skeleton blue_blush blue_eyes blush blushing bottomless dialog dialogue dialogue_box drool drooling gay grabbing_own_leg heki_(artist) legs_apart legs_held_open legs_spread legs_up male male_only sans skeleton solo solo_male spread_legs text text_box undertale undertale_(series) undertale_sans
1boy 2018 animated_skeleton blue_blush blue_eyes blush blushing bottomless dialog dialogue dialogue_box drool drooling gay grabbing_own_leg heki_(artist) legs_apart legs_held_open legs_spread legs_up male male_only sans skeleton solo solo_male spread_legs text text_box undertale undertale_(series) undertale_sans
blush kustard male_only sans sans_au sanscest selfcest singingsans_(artist) soul soul_licking soul_sex underfell underfell_sans undertale undertale_au undertale_sans
blush kustard male_only sans sans_au sanscest selfcest singingsans_(artist) soul soul_licking soul_sex underfell underfell_sans undertale undertale_au undertale_sans
1boy 2d after_sex big_belly blue_body bottomless cum cumflation ectobody implied_incest inflation kneeling male male_only mellednsfw orange_cum sans solo sweater undertail undertale undertale_(series) undertale_sans
1boy 2d after_sex big_belly blue_body bottomless cum cumflation ectobody implied_incest inflation kneeling male male_only mellednsfw orange_cum sans solo sweater undertail undertale undertale_(series) undertale_sans
blowjob deepthroat drooling fellatio male_only oral oral_sex sans sanscest under_the_table underfell underfell_sans undertale undertale_sans winking
blowjob deepthroat drooling fellatio male_only oral oral_sex sans sanscest under_the_table underfell underfell_sans undertale undertale_sans winking
1ambiguous 1boy ambiguous_gender anon anonymous anonymous_character arms_around_partner bedroom_eyes blush breath breath_cloud chubby chubby_male comic_sans deltarune dialogue ectobody ectoplasm embrace fat fat_man grin half-closed_eyes hand_on_belly heart hearts_around_head hugging hugging_belly lifting_shirt male mittens monster obese obese_male overweight overweight_male patting patting_belly permanent_smile relaxed sans sans_(undertale) shirt_lift sigh skeleton smile sweater sweater_lift sweatpants toby_fox undertale undertale_(series) undertale_sans yaizl_art
1ambiguous 1boy ambiguous_gender anon anonymous anonymous_character arms_around_partner bedroom_eyes blush breath breath_cloud chubby chubby_male comic_sans deltarune dialogue ectobody ectoplasm embrace fat fat_man grin half-closed_eyes hand_on_belly heart hearts_around_head hugging hugging_belly lifting_shirt male mittens monster obese obese_male overweight overweight_male patting patting_belly permanent_smile relaxed sans sans_(undertale) shirt_lift sigh skeleton smile sweater sweater_lift sweatpants toby_fox undertale undertale_(series) undertale_sans yaizl_art
blue_blush blue_cum blush crying cum cum_on_body cum_on_chest cum_on_face cumming gay laying_on_bed logo_(pixiv30462562) male male_only on_bed pixiv_id_30462562 sans sex_toy skeleton sweat sweating tears undertail undertale undertale_(series) undertale_sans
blue_blush blue_cum blush crying cum cum_on_body cum_on_chest cum_on_face cumming gay laying_on_bed logo_(pixiv30462562) male male_only on_bed pixiv_id_30462562 sans sex_toy skeleton sweat sweating tears undertail undertale undertale_(series) undertale_sans
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
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
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
blush drooling kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush drooling kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
2d commission commission_art digital_media_(artwork) doggy_style eeeeee funny give_us_your_balls humanoid meme oc original_character sans tagme undertale undertale_(series) undertale_au undertale_sans vaginal_penetration
2d commission commission_art digital_media_(artwork) doggy_style eeeeee funny give_us_your_balls humanoid meme oc original_character sans tagme undertale undertale_(series) undertale_au undertale_sans vaginal_penetration
blush kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blue_blush blue_cum blue_tongue blush cum cumming drool drooling logo_(pixiv30462562) male male_only penetration pink_tentacles pixiv_id_30462562 rape sans skeleton solo_focus soul_sex sweat sweating tentacle tentacle_penetration tentacle_rape tentacle_sex tentacle_wrapped_around_body tentacles tongue tongue_out undertail undertale undertale_(series) undertale_sans white_background
blue_blush blue_cum blue_tongue blush cum cumming drool drooling logo_(pixiv30462562) male male_only penetration pink_tentacles pixiv_id_30462562 rape sans skeleton solo_focus soul_sex sweat sweating tentacle tentacle_penetration tentacle_rape tentacle_sex tentacle_wrapped_around_body tentacles tongue tongue_out undertail undertale undertale_(series) undertale_sans white_background
animated_skeleton blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush blushing bonely_hearts_club clothed clothing ectopenis grabbing_own_penis lightsaber_dick looking_at_viewer male male_only masturbation meta_request one_eye_closed penis sans sans_blush sans_eye sans_glowing_eye sans_penis serfuzzy skeleton solo solo_male tagme transparent_background undertail undertale undertale_(series) undertale_sans
animated_skeleton blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush blushing bonely_hearts_club clothed clothing ectopenis grabbing_own_penis lightsaber_dick looking_at_viewer male male_only masturbation meta_request one_eye_closed penis sans sans_blush sans_eye sans_glowing_eye sans_penis serfuzzy skeleton solo solo_male tagme transparent_background undertail undertale undertale_(series) undertale_sans
blush kustard leg_hump male_only sans sans_au sanscest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush kustard leg_hump male_only sans sans_au sanscest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
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
fingering macro/micro male_only micro_on_macro rubbing sans sanscest selfcest shocked_expression text underfell underfell_sans undertale undertale_sans
fingering macro/micro male_only micro_on_macro rubbing sans sanscest selfcest shocked_expression text underfell underfell_sans undertale undertale_sans
1boy 2d animated_skeleton blue_blush blue_penis blush blushing closed_eyes clothed clothing desperation ectopenis english_text glowing_penis kneeling lightsaber_dick male male_only masturbation non-human penis precum sans skeleton solo solo_male sweat sweating text undertail undertale undertale_(series) undertale_sans
1boy 2d animated_skeleton blue_blush blue_penis blush blushing closed_eyes clothed clothing desperation ectopenis english_text glowing_penis kneeling lightsaber_dick male male_only masturbation non-human penis precum sans skeleton solo solo_male sweat sweating text undertail undertale undertale_(series) undertale_sans
1boy 1cuntboy 2018 black_sclera blue_blush blue_pussy blush cuntboy cuntboy_on_male ectopenis ectopussy imsinfull incest 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
1boy 1cuntboy 2018 black_sclera blue_blush blue_pussy blush cuntboy cuntboy_on_male ectopenis ectopussy imsinfull incest 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
6_arms arachnid arthropod fellatio group group_sex muffet oral penis sans sex skeleton spider threesome undead underfell underfell_sans undertale undertale_fanfiction undertale_sans video_games
6_arms arachnid arthropod fellatio group group_sex muffet oral penis sans sex skeleton spider threesome undead underfell underfell_sans undertale undertale_fanfiction undertale_sans video_games