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1:1 1:1_aspect_ratio 1boy 2023 2d animated_skeleton bikini bikini_bottom bikini_top blue_bikini blue_bikini_bottom blue_bikini_top cowboy_shot crossdressing day detailed_background digital_media looking_at_viewer male male_only monster s2ames2 sans_(undertale) sea skeleton sky solo_male swimsuit teeth two-piece_swimsuit undead undertale undertale_(series) water

animated_skeletonbikini

2boys 2d animated_skeleton artist_request blue_blush blue_tongue blush bodily_fluids bottom_sans clothing digital_media disembodied_penis ectotongue fangs fellatio fluids genitals grey_background humanoid licking licking_penis male male/male male_only monster oral orange_penis penis penis_grab sans_(undertale) sex simple_background skeleton solo_focus tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_games yaoi

animated_skeletonartist_request

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animated_skeletonarms_around_another

... 2022 2boys 2d animated_skeleton artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother/brother brothers cape clothed clothing dialog dialogue digital_media duo ectotongue empath__life english_text fontcest gloves grey_background hands_around_neck hands_on_another's_shoulders hands_on_shoulders hooded_jacket hoodie humanoid incest intraspecies jacket kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_nude saliva saliva_on_tongue saliva_trail sans_(undertale) scarf sequential sibling_incest siblings simple_background skeleton taking_off_clothes teeth tel_a_friend text tongue top_papyrus topless topless_male undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games watermark yaoi

...animated_skeleton

2018 2boys 2d after_penetration after_sex anal animated_skeleton ass blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother/brother brothers clothed clothing completely_nude completely_nude_male cuddling cum cum_inside cum_leaking digital_media duo ectopenis ectoplasm erection fluids fontcest genital_fluids genitals hugging humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush orange_penis papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pillow pussy sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton sweat top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi

after_penetrationafter_sex

2018 2boys 2d anal animated_skeleton apron ass big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_penis blush blush_lines bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers chinese_text clothed clothing digital_media duo ectopenis erection fontcest from_front_position humanoid incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy orange_background orange_blush orange_penis pants papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans_(undertale) sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble teeth text top_papyrus undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi

analanimated_skeleton

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alternate_costumeanal

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analanal_penetration

2018 2boys 2d ambiguous_fingering anal anal_fingering animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blue_penis blush bodysuit bottom_sans bottomless bottomless_male bottomwear brother/brother brothers clothed clothed/nude clothing digital_media duo ectopenis ectoplasm ectopussy erection fingering fingering_another fingering_partner fontcest genitals gloves humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush papyrus_(undertale) papysans partially_clothed partially_colored penetration penis pussy sans_(undertale) scarf sex sibling_incest siblings sitting skeleton top_papyrus topwear trembling undead undertale undertale_(series) vaginal video_games yaoi

ambiguous_fingeringanal

... 2018 2boys 2d after_sex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother/brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus_(undertale) papysans penis pussy ribs sans_(undertale) semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat teeth text tissue tissue_box tissue_paper top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi

2018 2boys 2d ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers clothed clothing dark_background digital_media duo ectopenis ectoplasm ectopussy erection fontcest humanoid incest intraspecies kissing leg_grab leg_up male male/male male_focus male_only male_penetrating mianpigui_(wqw1201501125) monster monster_boy on_side papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans_(undertale) scarf sex shirt_up sibling_incest siblings simple_background skeleton sweat teeth top_papyrus undead undertale undertale_(series) video_games yaoi

ambiguous_penetrationanal

2023 2boys 2d animated_skeleton ass bed bottom_sans bottomless bottomless_male brother/brother brothers clothed clothing dark dark_room digital_media duo fontcest humanoid incest intraspecies kneeling male male/male male_focus male_only mianpigui_(wqw1201501125) monochrome monster monster_boy on_bed pants_around_legs pants_down pants_pulled_down papyrus_(undertale) papysans power_bottom sans_(undertale) sibling_incest siblings skeleton top_papyrus undead undertale undertale_(series) video_games yaoi

animated_skeletonass

... 2023 2boys 2d ? animated_skeleton ass black_pants blue_hoodie blue_jacket book bottom_sans brother/brother brothers clothed clothing digital_media duo fontcest gloves holding_book holding_object hooded_jacket hoodie humanoid implied_incest jacket looking_at_crotch looking_down male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy pants papyrus_(undertale) papysans penis red_gloves sans_(undertale) shirt_lift shirt_up siblings skeleton spoken_ellipsis sweat top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi

1boy 1girl 2016 2d animated_skeleton anonymous anonymous_female bigger_male blush blushing_male breasts cape carrying carrying_another carrying_partner closed_eyes clothed clothed/nude clothed_male clothed_male_nude_female clothing dinkynsfw duo ectopenis embarrassed embarrassed_male erection face_between_breasts face_in_breasts face_on_breast fellatio female frenulum frenum genitals gloves hetero hugging humanoid interspecies larger_male licking licking_penis looking_away male male/female monster nipples nude nude_female nude_female_clothed_male oral papyrus_(undertale) penile penis penis_grab penis_lick scarf sex skeleton smaller_female sweat teeth text top_papyrus traditional_media undead undertale undertale_(series) video_games

animated_skeletonanonymous

2023 2boys 2d animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_panel cum cum_on_head cum_splatter digital_media dominant dominant_male drooling duo ectopenis extreme_size_difference fontcest frotting giant gloves heart heart-shaped_pupils heart_eyes hoodie humanoid implied_bottomless implied_penis incest intraspecies jacket larger_male macro macrophilia male male/male male_only maledom malesub micro microphilia miniboy monster orange_cum orange_penis papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans_(undertale) sibling_incest siblings size_difference skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus soul submissive submissive_male thrusting top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi youfoundta

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1:1 2023 2boys 2d after_deepthroat after_fellatio after_oral animated_skeleton big_penis blue_blush blush bottom_sans brother/brother brothers deepthroat duo ectopenis fellatio fontcest huge_penis incest intraspecies long_penis male male/male male_only monster monster_boy monster_cock monster_penis oral orange_penis papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans_(undertale) sex sibling_incest siblings skeleton solo_focus teeth top_papyrus traditional_media uncensored undead undertale undertale_(series) unseen_male_face veiny_penis video_games yaoi youfoundta

after_deepthroatafter_fellatio

1:1 1:1_aspect_ratio 1boy 2d animated_skeleton artist_name blue_blush blush bottom_sans clothed clothing digital_media english_text glowing groping hand_on_chest hand_on_face hands humanoid implied_masturbation male male_focus male_only malesub monochrome monster multiple_views orgasm_face partially_clothed partially_colored sans_(undertale) shirtless sigh simple_background singingsans skeleton solo_focus solo_male submissive submissive_male talking_to_viewer text third-party_source topless topless_male trembling undead undertale undertale_(series) video_games

animated_skeletonartist_name

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1boy 2d animated_skeleton artist_name blue_blush blue_tentacles blush bottom_sans bound bound_arms completely_nude completely_nude_male digital_media drooling humanoid male male_focus male_only malesub monochrome monster nude nude_male one_eye_closed partially_colored restrained sans_(undertale) simple_background singingsans skeleton solo_male submissive submissive_male tentacle tentacle_around_arm tentacle_around_arms tentacle_around_leg tentacle_on_male tentacle_sex tentacles tentacles_on_male third-party_source undead undertale undertale_(series) video_game_character video_games

animated_skeletonartist_name

1boy 2d animated_skeleton blue_blush blush bottom_sans closed_mouth digital_media drooling english_text fangs humanoid lowres male male_focus male_only malesub monochrome monster partially_colored sans_(undertale) simple_background singingsans skeleton solo_male submissive submissive_male text third-party_source undead undertale undertale_(series) video_games

animated_skeletonblue_blush

1boy 2d animated_skeleton blue_blush blush bondage bottom_sans bound bound_wrists digital_media disembodied_hand disembodied_hands drooling groping hands hands_over_head humanoid kneel kneeling magic_hands male male_focus malesub monochrome monster pants_down pants_pulled_down partially_colored profanity restrained sans_(undertale) sequential shirt_lift shirt_pulled_up shirt_up simple_background singingsans skeleton solo_focus solo_male submissive submissive_male sweat third-party_source tied_up tied_wrists touching_crotch trembling undead undertale undertale_(series) video_games

animated_skeletonblue_blush

1boy 2d animated_skeleton blue_blush blue_tongue blush bottom_sans dark digital_media drooling ectotongue fangs humanoid male male_focus male_only malesub monochrome monster partially_colored pleasure_face sans_(undertale) sequential simple_background singingsans skeleton solo_male submissive submissive_male sweat third-party_source tongue tongue_out trembling undead undertale undertale_(series) upper_body video_games

animated_skeletonblue_blush

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animated_skeletonblue_blush

2016 2boys 2d animated_skeleton ass bent_over blue_ass blue_body blue_butt blue_hoodie blue_jacket blush bottom_sans clothed/nude digital_media drooling duo ectobody ectobutt elemental_creature elemental_humanoid fire_elemental from_behind_position glasses glasses_only grillby grillsans heart hood hooded_jacket humanoid interspecies jacket male male/male male_only monster monster_boy orange_body penetration penetration_from_behind sans_(undertale) sex sex_from_behind simple_background skeleton third-party_source top_grillby trembling undead undertale undertale_(series) unknown_artist unknown_artist_signature video_games white_background yaoi

animated_skeletonass

2016 2boys 2d animated_skeleton arms_behind_back artist_name beoteono black_tentacles blue_blush blue_penis blush bodily_fluids bottom_sans buttercupsticks clothed clothing digital_media dominant dominant_male drooling duo ectopenis feet_out_of_frame fluids grabbing_another's_chin grabbing_chin grey_background hand_under_chin hands_behind_back humanoid male male/male male_focus male_only maledom malesub monster one_eye_closed partially_colored penis precum profanity sans_(undertale) sanster simple_background skeleton soul soul_sex submissive submissive_male tentacle tentacle_on_male tentacles tentacles_around_legs tentacles_on_male text top_gaster undead undertale undertale_(series) video_games w.d._gaster yaoi

animated_skeletonarms_behind_back

1boy 2016 2d animated_skeleton blue_blush blue_eyes blue_tentacles blue_tongue blush bottom_sans completely_nude completely_nude_male dark_background digital_media disembodied_hand disembodied_hands drooling ectotongue feet_out_of_frame hands heart-shaped_pupils heart_eyes humanoid male male_focus male_only malesub monster nude nude_male penis sans_(undertale) simple_background skeleton soul soul_sex spontaneouslynsfw submissive submissive_female submissive_male tentacle tentacle_on_male tentacle_sex tentacles_on_male tongue undead undertale undertale_(series) video_game_character video_games wet

animated_skeletonblue_blush

1:1 1:1_aspect_ratio 1boy 2016 2d animated_skeleton bedroom blue_blush blue_hoodie blue_jacket blue_penis blush clothed clothing covering_mouth covering_own_mouth dark dark_room digital_media ectopenis fully_clothed glowing glowing_genitalia glowing_penis hand_on_mouth hooded_jacket hoodie humanoid indoors jacket male male_focus male_masturbation male_only masturbation monster one_eye_closed penile_masturbation penis pink_slippers sans_(undertale) sitting skeleton slippers small_penis solo_male spontaneouslynsfw sweat undead undertale undertale_(series) video_game_character video_games

animated_skeletonbedroom

1boy 2016 2d animated_skeleton begging begging_for_more blue_blush blue_tongue blush bottom_sans clothed clothing dark_background digital_media disembodied_hand disembodied_hands ectotongue english_text fangs groping hands hands_behind_head heart-shaped_pupils humanoid male male_focus malesub moaning monster penis pleasure_face sans_(undertale) shirt_up simple_background skeleton soul soul_sex spontaneouslynsfw submissive submissive_male sweat text tongue tongue_out undead undertale undertale_(series) visible_breath

animated_skeletonbegging

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animated_skeletonblue_blush

1:1 1:1_aspect_ratio 2015 2d animated_skeleton anonymous artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis bottom_sans collar collar_only digital_media duo ectopenis grabbing_chest hand_on_another's_chest hand_on_another's_head hand_on_chest hand_on_head handjob humanoid male male_focus male_only monster naked nude one_eye_closed penis pet_play petplay sans_(undertale) simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tears third-party_source trembling undead undertale undertale_(series) video_games yaoi

animated_skeletonanonymous

1boy 2010s 2015 2d 2d_(artwork) animated_skeleton ass bad_id bad_tumblr_id blue_background blue_tongue bondage bottom_sans bound bound_legs completely_nude completely_nude_male digital_media_(artwork) ectopenis ectotongue genitals inactive_account legs_apart male male_focus male_only monster noxiousaberration nude penis sans sans_(undertale) simple_background skeleton submissive submissive_male tentacle third-party_source tied_arms tied_up tongue tongue_out tumblr uke_sans undead undertale undertale_(series) video_game_character video_games

animated_skeletonass

2021 2boys 2d animated_skeleton anonymous anonymous_male bottom_sans clothed clothing cum cum_in_head cum_inside digital_media duo forced grabbing_head hand_on_another's_head hand_on_head head_grab humanoid male male/male male_focus male_only malesub minominoks monochrome monster penetration penis sans_(undertale) sex simple_background skeleton skull_fucking solo_focus submissive submissive_male undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games white_background yaoi

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2018 2boys 2d animated_skeleton blindfold blindfolded blue_tongue bondage bottom_sans bound bound_arms bound_wrists brother/brother brothers clothed clothed/nude clothing collar comic comic_panel digital_media dominant dominant_male domination duo ectopenis ectotongue english_text fontcest imminent_fellatio imminent_oral incest lowest-of-dirt male male/male male_only maledom monster nude orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) silhouette skeleton submissive text tied_arms tied_up tongue top_papyrus undead undertale undertale_(series) unzipping_pants video_game_character video_games white_background yandere yaoi

animated_skeletonblindfold

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analanimated_skeleton

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animated_skeletonanonymous

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