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1anthro 1boy 1girl anthro blush blush_stickers clothed clothes clothing cute electrical_plug electrical_plug_tail for_a_head glow_in_the_dark glowing glowing_genitalia glowing_penis grossthing_(artist) lamp lampert_(regretevator) lampshade lifting_clothing male male_anthro male_focus male_only male_shortstack navel object_head penis regretevator roblox roblox_game shortstack sketch small_penis solo_focus solo_male sweater sweater_only tail text thick_thighs 1boy anus anus_focus ass ass_bigger_than_head bodily_fluids boy dark_background divineflesh_(artist) exotic glowing_genitalia glowing_penis grin lamp lampert_(regretevator) male male_only non-human paw_focus paws perspective regretevator roblox roblox_game robloxian smiling_at_viewer tapering_penis tentacle_penis tired_eyes twink yellow_penis 1:1 1:1_aspect_ratio 2boys animated_skeleton big_penis blue_blush blue_hoodie blue_jacket blue_penis blush bodily_fluids bottomless bottomless_male brother brother/brother brother_and_brother brothers cock_hungry cum cumshot drooling duo ectopenis ectoplasm english_text fantasizing fontcest genitals glowing glowing_genitalia glowing_penis hands_on_cheeks hands_on_own_cheeks heart-shaped_pupils heart_eyes hooded_jacket hoodie hoodie_only incest jacket looking_at_penis looking_down male male/male male_only measurements monster multiple_views nude orange_cum orange_penis otterrpopp papyrus papyrus_(undertale) penis penis_measurement penis_measuring precum sans sans_(undertale) skeleton small_penis smooth_penis solo_focus talking talking_to_self text thinking third-party_source topwear undead undertale undertale_(series) unseen_character unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi 1girl 2_girls anal ass big_ass futanari futanari_on_female glowing_genitalia high_heels mating_press puffy_anus spartanalloy tail tail_insertion thick_thighs vaginal_penetration valkyr_(warframe) warframe wide_hips yareli_(warframe) 1boy 2d 2d_(artwork) animated_skeleton ass blue_blush blue_penis blush bodily_fluids clothing couch digital_media_(artwork) ectopenis erection fluids genitals glowing glowing_genitalia glowing_penis hooded_jacket hoodie jacket male male_masturbation male_only masturbation moaning monster penile penile_masturbation penis precum sans sans_(undertale) sitting sitting_on_couch sitting_on_sofa skeleton sofa solo_male text touching_penis undead undertale undertale_(series) video_games 1boy 1cuntboy 2010s 2015 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_jacket blue_pussy blush bottom_on_top bottom_sans bottomwear brother brother/brother brother_and_brother brother_penetrating_brother brothers brown_background clitoris clothed clothing cuntboy cuntboy_penetrated digital_media_(artwork) drooling duo ectopenis ectopussy fontcest genitals gloves glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes incest jacket larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy male_only male_penetrating male_penetrating_cuntboy monster orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing pussy pussy_through_clothing red_gloves royalstash sans sans_(undertale) seme_papyrus sex sex_through_clothes simple_background sitting skeleton smaller_cuntboy smaller_penetrated solid_color_background text top_papyrus topwear uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_eyes blue_penis blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing crying crying_with_eyes_open dominant dominant_male duo ectopenis ectotongue edit edited fontcest from_behind_position gay_sex gif gloves glowing glowing_genitalia glowing_penis grabbing grabbing_clothing grabbing_from_behind heart-shaped_pupils heart_eyes incest larger_male male male/male male_focus male_only maledom malesub monster open_mouth orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_behind penis pleasure_face realdemdemdmensfw sans sans_(undertale) seme_papyrus sex sex_from_behind simple_background skeleton slideshow small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male tears tears_of_pleasure third-party_edit tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi 2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_eyes blue_penis blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing crying crying_with_eyes_open dominant dominant_male duo ectopenis ectotongue edit edited fontcest from_behind_position gay_sex gloves glowing glowing_genitalia glowing_penis grabbing grabbing_clothing grabbing_from_behind heart-shaped_pupils heart_eyes incest larger_male long_image male male/male male_focus male_only maledom malesub monster open_mouth orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_behind penis pleasure_face realdemdemdmensfw sans sans_(undertale) seme_papyrus sex sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male tears tears_of_pleasure third-party_edit tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi 2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_penis bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dominant dominant_male duo ectopenis fontcest from_behind_position gay_sex glowing glowing_genitalia glowing_penis incest larger_male male male/male male_focus male_only maledom malesub monster orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_behind penis realdemdemdmensfw sans sans_(undertale) seme_papyrus sex sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi 2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dated dominant dominant_male duo ectopenis fontcest from_front_position genitals glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes incest jacket kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster off_shoulder orange_blush orange_penis papyrus papyrus_(undertale) papysans penis realdemdemdmensfw sans sans_(undertale) seme_papyrus sex skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name ass bigger_male blue_blush blue_penis blush bottom_sans brother brother/brother brother_and_brother brothers closed_eyes dated duo ectopenis fontcest genitals glowing glowing_genitalia glowing_penis hand_on_another's_head hand_on_head incest kissing larger_male male male/male male_only monster naked_male nude nude_male orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penis realdemdemdmensfw sans sans_(undertale) seme_papyrus skeleton smaller_male top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 1:1 1:1_aspect_ratio 1boy 2020s 2023 alternate_version_available animated_skeleton artist_name artist_signature bed bed_sheet bedroom black_and_white black_background blue_blush blush bottomwear bulge clothed clothing comic_sans drooling english_text fallen_ghost_angel_(artist) fully_clothed gloves glowing glowing_genitalia hooded_jacket hoodie indoors jacket looking_down male male_focus male_masturbation male_only masturbation monochrome monster off_shoulder on_bed partially_colored penis_bulge pixel_(artwork) pixel_art sans sans_(undertale) skeleton solo_male soul soul_sex text topwear undead undertale undertale_(series) visible_breath white_gloves 1boy 2020s 2022 animated_skeleton artist_name artist_signature bed bed_sheet bedroom blanket blue_blush blue_jacket blue_penis blush bottomless clothed clothing ectopenis fallen_ghost_angel_(artist) gloves glowing glowing_genitalia glowing_penis hooded_jacket hoodie indoors jacket laying_on_back laying_on_bed looking_away lying_on_back lying_on_bed male male_focus male_only monster on_bed partially_clothed penile penis pixel_(artwork) pixel_art sans sans_(undertale) sequence sequential skeleton smooth_penis solo_male sweat topless topwear undead undertale undertale_(series) white_gloves 1:1 1:1_aspect_ratio 1boy 2020s 2022 animated_skeleton artist_name artist_signature bed bed_sheet bedroom black_pants blue_blush blue_jacket blush boner boner_in_pants bulge clothed clothing covering_crotch embarrassed erection erection_under_clothes fallen_ghost_angel_(artist) fully_clothed fully_clothed_male gloves glowing glowing_genitalia hands_on_crotch hooded_jacket hoodie horny horny_male indoors jacket looking_away male male_focus male_only monster pants penis_bulge pink_slippers pixel_(artwork) pixel_art sans sans_(undertale) sequence sequential sitting sitting_on_bed skeleton slippers solo_male undead undertale undertale_(series) white_gloves 1:1 1:1_aspect_ratio 1boy 2020s 2022 animated_skeleton arm_support artist_name artist_signature bed bed_sheet bedroom black_pants blue_blush blue_jacket blush boner boner_in_pants bulge clothed clothing erection erection_under_clothes fallen_ghost_angel_(artist) fully_clothed fully_clothed_male glowing glowing_genitalia hooded_jacket hoodie horny horny_male indoors jacket male male_focus male_only monster pants penis_bulge pink_slippers pixel_(artwork) pixel_art pleasure_face sans sans_(undertale) sequence sequential sitting sitting_on_bed skeleton slippers solo_male throbbing throbbing_penis undead undertale undertale_(series) 1:1 1:1_aspect_ratio 1boy 2020s 2022 animated_skeleton arm_support artist_name artist_signature black_pants blue_blush blue_jacket blush boner boner_in_pants bulge clothed clothing comic_sans english_text erection erection_under_clothes fallen_ghost_angel_(artist) fully_clothed fully_clothed_male gloves glowing glowing_genitalia hooded_jacket hoodie horny horny_male in_heat jacket male male_focus male_only monster one_eye_closed pants penis_bulge pink_slippers pixel_(artwork) pixel_art public sans sans_(undertale) sequence sequential sitting skeleton slippers solo_male speech_bubble sweat talking_to_self text text_bubble throbbing throbbing_penis undead undertale undertale_(series) visible_breath white_gloves 1:1 1:1_aspect_ratio 1boy 2020s 2022 animated_skeleton arm_support artist_name artist_signature black_pants blue_blush blue_jacket blush boner boner_in_pants bulge clothed clothing comic_sans english_text erection erection_under_clothes fallen_ghost_angel_(artist) fully_clothed fully_clothed_male gloves glowing glowing_genitalia hooded_jacket hoodie horny horny_male in_heat jacket looking_down male male_focus male_only monster pants penis_bulge pink_slippers pixel_(artwork) pixel_art public sans sans_(undertale) sequence sequential sitting skeleton slippers solo_male speech_bubble sweat talking_to_self text text_bubble undead undertale undertale_(series) white_gloves 1:1 1:1_aspect_ratio 1boy 2010s 2016 animated_skeleton bedroom blue_blush blue_hoodie blue_jacket blue_penis blush clothed clothing covering_mouth covering_own_mouth dark_room ectopenis fully_clothed glowing glowing_genitalia glowing_penis hand_on_mouth hooded_jacket hoodie indoors jacket male male_focus male_masturbation male_only masturbation monster one_eye_closed penile_masturbation penis pink_slippers sans sans_(undertale) sitting skeleton slippers small_penis solo_male spontaneouslynsfw sweat undead undertale undertale_(series) 1girl 3futas anal animated anthro big_breasts blaze_the_cat bodily_fluids breast_grab breast_play breasts chao cum cum_in_pussy cum_inside dark_body dark_chao dark_skin deerbone_(artist) domestic_cat felid feline felis female full_nelson genital_fluids genitals glare glowing glowing_body glowing_eyes glowing_genitalia group gynomorph hand_on_breast handjob hero_chao hi_res huge_filesize humanoid intersex intersex/female larger_female leaking_cum looking_pleasured mammal nervous no_sound nude oral orgasm paizuri penetration penile rimming sega sex size_difference smaller_intersex smile sonic_(series) sonic_the_hedgehog_(series) teasing thrusting vaginal vaginal_penetration webm wide_hips 2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton artist_name begging_for_more blue_blush blush blush_lines blushing_male bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media_(artwork) dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background incest male male/male male_only maledom malesub moaning monster orange_blush papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans sans_(undertale) seme_papyrus sex sex_from_front simple_background skeleton solid_color_background stand_and_carry_position standing submissive submissive_male suspended_congress swearing sweat tel_a_friend text top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games watermark yaoi 2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush boner boner_in_pants bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors large_filesize laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) waking_up yaoi 2010s 2017 2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush boner boner_in_pants bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open digital_media_(artwork) dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors large_filesize laying_on_bed long_image looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tall_image tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) video_games waking_up yaoi 2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia groping groping_from_behind hand_in_pants hand_under_clothes incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh surprised surprised_expression tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi 2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi 2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi 2010s 2017 2boys animated_skeleton bed bedroom blanket boner boner_in_pants bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel dry_humping duo erection erection_under_clothes fontcest glowing glowing_genitalia humping incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi 2010s 2017 2boys animated_skeleton bed bedroom blanket bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi 1:1 1:1_aspect_ratio 1boy animated_skeleton blue_blush blush clothed clothing glowing glowing_genitalia hand_in_pants hand_on_crotch hooded_jacket hoodie implied_masturbation jacket legs_apart male male_only moaning monster one_eye_closed sans sans_(undertale) sexy-spaghetti_(artist) skeleton socks solo_male soul text touching_crotch trembling trembling_legs undead undertale undertale_(series) white_background 1boy 1cuntboy 2020s 2023 2d 2d_(artwork) animated_skeleton balls blue_clitoris blue_pussy blush blushing_male bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris clothed clothing cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male drooling duo ectopenis ectoplasm ectopussy english_text fontcest from_behind_position gloves glowing glowing_genitalia glowing_penis grabbing_legs grey_background incest legs_apart male male/cuntboy male_penetrating male_penetrating_cuntboy maledom mellouwana monster orange_balls orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_gloves sans sans_(undertale) seme_papyrus sex simple_background skeleton smiling smiling_at_viewer speech_bubble submissive submissive_cuntboy talking talking_to_another talking_to_viewer testicles text text_bubble thank_you top_papyrus uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_games yaoi 1boy 2d 2d_(artwork) animated_skeleton arm_support biting_clothes biting_shirt blue_blush blue_penis blush bulge bulge_under_clothes digital_media_(artwork) doiduh ectopenis glowing glowing_genitalia glowing_penis looking_up male male_only malesub monster penis penis_bulge penis_peek precum sans sans_(undertale) skeleton solo_male submissive submissive_male sweat undead undertale undertale_(series) unknown_source video_games white_background 1boy after_masturbation animated_skeleton artist_request blue_penis clothed clothing comic_sans cum cum_on_clothes cum_on_self ectopenis glowing glowing_eye glowing_genitalia glowing_penis hooded_jacket hoodie jacket male male_only monochrome monster partially_colored sans sans_(undertale) skeleton solo_male sweat text trembling undead undertale undertale_(series) 1boy 2010s 2017 animated_skeleton arms_behind_back blue_jacket blush bondage boner boner_in_pants bottom_sans bound bound_arms bulge bulge_through_clothing bulge_under_clothes chubby chubby_male clothed clothing drooling erection erection_under_clothes glowing glowing_genitalia jacket male male_focus male_only malesub monster off_shoulder off_shoulders one_eye_closed restrained restraints sans sans_(undertale) skeleton solo_male submissive submissive_male tasty-haram tied_up uke_sans undead undertale undertale_(series) 2020s 2021 2boys 2d 2d_(artwork) animated_skeleton artist_name beetleevil begging biting_clothes biting_shirt blue_blush blue_tongue blush blushing_male bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothing crotch_rub cussing digital_media_(artwork) dirty_talk dry_humping duo ectopenis ectoplasm ectotongue edit edited english_text evilbeetle fontcest glowing_genitalia grabbing_wrist grey_background hand_on_crotch heart-shaped_pupils heart_eyes horny horny_male humping incest large_filesize long_image male male/male male_only male_penetrated male_penetrating moaning monochrome monster orange_blush orange_shirt pants_around_legs pants_around_thighs pants_down papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_colored pervert profanity reverse_suspended_congress sans sans_(undertale) seme_papyrus sequence sequential shirt_up simple_background skeleton soul soul_sex speech_bubble spoken_musical_note stand_and_carry_position stealth_sex swearing talking talking_to_another talking_to_partner tall_image tears tears_of_pleasure text text_bubble third-party_edit top_papyrus touching_crotch trembling uke_sans undead undertale undertale_(series) video_games yaoi 2020s 2021 2boys animated_skeleton artist_name beetleevil biting_clothes biting_shirt blue_blush blush blushing_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothing crotch_rub cussing dirty_talk dry_humping duo ectoplasm english_text evilbeetle fontcest glowing_genitalia grabbing_wrist grey_background hand_on_crotch heart-shaped_pupils heart_eyes horny horny_male humping incest male male/male male_only moaning monochrome monster orange_blush pants_around_legs pants_around_thighs pants_down papyrus papyrus_(undertale) papysans partially_colored pervert profanity sans sans_(undertale) seme_papyrus sequence sequential shirt_up simple_background skeleton soul soul_sex speech_bubble spoken_musical_note stealth_sex swearing talking_to_another talking_to_partner tears tears_of_pleasure text text_bubble top_papyrus touching_crotch trembling uke_sans undead undertale undertale_(series) yaoi 2010s 2019 2boys animated_skeleton arm_support beetleevil blue_blush blush boner boner_in_pants bottom_sans brother brother/brother brother_and_brother brothers closed_eyes clothed clothing crotch_rub duo ectotongue erection erection_under_clothes erection_under_pants evilbeetle fontcest glowing glowing_genitalia grey_background grope_from_behind groping groping_from_behind hand_on_crotch hand_under_clothes hand_under_shirt incest licking licking_neck male male/male male_only monochrome monster one_eye_closed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus simple_background skeleton tongue top_papyrus touching_crotch uke_sans undead undertale undertale_(series) yaoi 1girl absurd_res all_fours anthro bat big_dom_small_sub big_penis bodily_fluids breasts comic deadlocked dialogue dominant duck_lock duo dust:_an_elysian_tail english_text faceless_character faceless_male fellatio fidget fidget_(elysian_tail) fur genital_fluids genitals glowing glowing_genitalia glowing_penis green_eyes high_res huge_penis humanoid_genitalia humanoid_penis imminent_sex it'll_never_fit larger_male licking male mammal membrane_(anatomy) membranous_wings moonblood nimbat nipples nude oral orange_body orange_fur penile penis penis_lick precum reptile scalie sereth sex size_difference smaller_female solo_focus sweat sweatdrop text tongue tongue_out unusual_anatomy unusual_genitalia unusual_penis vein veiny_penis wings 2020s 2022 2boys animated_skeleton blush blushing_male boner boner_in_pants bonerut brother brother_and_brother brothers clothed clothing couch duo glowing glowing_genitalia glowing_penis implied_incest implied_yaoi legs_apart male male_only monster orange_blush papyrus papyrus_(undertale) sans sans_(undertale) sitting sitting_on_couch sitting_on_sofa size_difference skeleton sleeping sofa 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uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games 1boy 2010s 2016 2d 2d_(artwork) animated_skeleton blue_blush blush boner boner_in_pants bottom_sans bound bound_wrists bulge clothed digital_media_(artwork) drooling erection glowing glowing_genitalia grey_background itsdunklesans jacket kneel looking_at_viewer male male_only malesub monster profanity restrained restraints sans sans_(undertale) simple_background skeleton solid_color_background solo solo_male submissive submissive_male tears text tied_up uke_sans undead undertale undertale_(series) video_game_character video_games 1boy 2010s 2016 2d 2d_(artwork) animated_skeleton blue_blush blush boner boner_in_pants bottom_sans clothed clothed_male clothing collar collar_and_leash digital_media_(artwork) drooling erection erection_under_clothes fully_clothed glowing glowing_genitalia hands_behind_head hooded_jacket hoodie itsdunklesans jacket leash leash_and_collar legs_apart male male_focus 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