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!! 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton artist_signature blue_blush blue_tongue blush bottom_sans bottomless brother brothers crying digital_media_(artwork) ectopenis ectoplasm fontcest genitals humanoid immolationyyx incest male male_focus male_out_of_frame male_penetrating monster monster_boy non-consensual nonconsensual orange_penis papyrus papyrus_(undertale) papysans penetration penis pixiv pixiv_id_9733540 pleading sans sans_(undertale) seme_papyrus sex shirt_only shirt_up skeleton solo_focus speech_bubble sweat tears text tongue top_papyrus trembling tumblr uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_border blue_blush blue_penis blue_tongue blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male cum cum_string cum_while_penetrated cum_while_penetrating cumming_together cumshot digital_media_(artwork) drooling duo ectopenis ectotongue ejaculation ejaculation_while_penetrated fontcest fully_clothed fully_clothed_male gay gay_sex genital_fluids genitals gloves heki_(miss60250) hooded_jacket hoodie incest intraspecies larger_penetrating larger_penetrating_smaller leg_grab leg_held_up legs_apart male male/male male_only male_penetrating_male monster monster_boy orange_blush orange_penis orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves saliva sans sans_(undertale) seme_papyrus sex shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs submissive tears third-party_source tongue tongue_out top_papyrus tumblr twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_border blue_blush blue_penis blue_tongue blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male cum cum_string cum_while_penetrated cum_while_penetrating cumming_together cumshot digital_media_(artwork) drooling duo ectopenis ectotongue ejaculation ejaculation_while_penetrated fontcest fully_clothed fully_clothed_male gay gay_sex genital_fluids genitals gloves heki_(miss60250) hooded_jacket hoodie incest intraspecies larger_penetrating larger_penetrating_smaller leg_grab leg_held_up legs_apart male male/male male_only male_penetrating_male monster monster_boy orange_blush orange_penis orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves saliva sans sans_(undertale) seme_papyrus sex shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs submissive tears third-party_source tongue tongue_out top_papyrus tumblr twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed digital_media_(artwork) drooling duo ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male penis penis_out saliva sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed digital_media_(artwork) drooling duo ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male penis penis_out saliva sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton arm_support big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_hoodie blue_jacket blush bottom_sans bottomless closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectoplasm elemental_creature elemental_humanoid eyewear fire_elemental from_behind_position from_front_position glasses grillby grillsans hooded_jacket hoodie humanoid jacket kissing larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub mastery_position monster monster_boy motion_lines multiple_views nude nude_male oaytacnoom orange_body orange_penis penetration penis rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straddling submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) video_games visible_breath white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton arm_support big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_hoodie blue_jacket blush bottom_sans bottomless closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectoplasm elemental_creature elemental_humanoid eyewear fire_elemental from_behind_position from_front_position glasses grillby grillsans hooded_jacket hoodie humanoid jacket kissing larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub mastery_position monster monster_boy motion_lines multiple_views nude nude_male oaytacnoom orange_body orange_penis penetration penis rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straddling submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) video_games visible_breath white_background yaoi
2010s 2017 2boys 2d 2d_(artwork) after_sex anal anal_penetration anal_sex animated_skeleton arm_around_another's_neck arm_around_neck ass big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blush bottom_sans bottomless closed_eyes completely_nude completely_nude_male digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fire_elemental from_front_position grillby hand_on_back hand_on_neck humanoid interlocked_fingers intertwined_fingers korean_text larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub missionary_position monster monster_boy multiple_views muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male text top_grillby topless uke_sans undead undertale undertale_(series) video_game_character video_games white_background window yaoi yooutnsfw
2010s 2017 2boys 2d 2d_(artwork) after_sex anal anal_penetration anal_sex animated_skeleton arm_around_another's_neck arm_around_neck ass big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blush bottom_sans bottomless closed_eyes completely_nude completely_nude_male digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fire_elemental from_front_position grillby hand_on_back hand_on_neck humanoid interlocked_fingers intertwined_fingers korean_text larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub missionary_position monster monster_boy multiple_views muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male text top_grillby topless uke_sans undead undertale undertale_(series) video_game_character video_games white_background window yaoi yooutnsfw
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton ass ass_grab ass_squeeze bed bigger_male black_socks blue_tongue bottom_sans bottomwear butt_grab digital_media_(artwork) duo elemental_creature elemental_humanoid facing_another fire_elemental grabbing_ass grillby grillsans humanoid imminent_sex larger_male male male/male male_only mari_keiyou_(artist) mastery_position mk-doodles monster monster_boy on_bed orange_body pants partially_clothed pink_slippers sans sans_(undertale) sitting sitting_on_bed skeleton slippers smaller_male socks squeezing_ass tongue tongue_out topless topless_male traditional_art traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton ass ass_grab ass_squeeze bed bigger_male black_socks blue_tongue bottom_sans bottomwear butt_grab digital_media_(artwork) duo elemental_creature elemental_humanoid facing_another fire_elemental grabbing_ass grillby grillsans humanoid imminent_sex larger_male male male/male male_only mari_keiyou_(artist) mastery_position mk-doodles monster monster_boy on_bed orange_body pants partially_clothed pink_slippers sans sans_(undertale) sitting sitting_on_bed skeleton slippers smaller_male socks squeezing_ass tongue tongue_out topless topless_male traditional_art traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1boy 1cuntboy 2010s 2019 2d action_figure animated_skeleton big_penis blue_blush blue_pussy blushing bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_page comic_panel cum cum_in_sex_toy cum_leaking cuntboy digital_media_(artwork) drawer ectopenis ejaculation english_text fleshlight fontcest gloves hooded_jacket hoodie huge_penis incest intraspecies jacket leaking_cum male male/cuntboy monochrome monster monster_boy nsfwgarbagedump orange_blush orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored penetrable_sex_toy penetration penis pocket_pussy portal_fleshlight portal_sex pussy sans sans_(undertale) seme_papyrus sequence sequential sex sex_toy sex_toy_penetration sibling_incest siblings skeleton text top_papyrus uke_sans undead undertale undertale_(series) veiny_penis yaoi
1boy 1cuntboy 2010s 2019 2d action_figure animated_skeleton big_penis blue_blush blue_pussy blushing bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_page comic_panel cum cum_in_sex_toy cum_leaking cuntboy digital_media_(artwork) drawer ectopenis ejaculation english_text fleshlight fontcest gloves hooded_jacket hoodie huge_penis incest intraspecies jacket leaking_cum male male/cuntboy monochrome monster monster_boy nsfwgarbagedump orange_blush orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored penetrable_sex_toy penetration penis pocket_pussy portal_fleshlight portal_sex pussy sans sans_(undertale) seme_papyrus sequence sequential sex sex_toy sex_toy_penetration sibling_incest siblings skeleton text top_papyrus uke_sans undead undertale undertale_(series) veiny_penis yaoi
1cuntboy 2010s 2019 2boys 2d 2d_(artwork) action_figure animated_skeleton bedroom big_penis blue_blush blue_pussy blush blushing blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cleaning comic comic_page comic_panel cum cum_in_sex_toy cum_leaking cuntboy digital_media_(artwork) drawer ectopenis edit edited ejaculation elemental_creature elemental_humanoid english_text fire_elemental fleshlight fontcest genitals gloves grillby hooded_jacket hoodie huge_penis humanoid incest indoors intraspecies jacket large_filesize leaking_cum long_image male male/cuntboy male_only messy_room monochrome monster monster_boy multiple_images nsfwgarbagedump orange_blush orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored penetrable_sex_toy penetration penis pocket_pussy portal_fleshlight portal_sex pussy sans sans_(undertale) seme_papyrus sequence sequential sex sex_toy sex_toy_penetration sibling_incest siblings sitting skeleton stairs talking tall_image tears text third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games yaoi
1cuntboy 2010s 2019 2boys 2d 2d_(artwork) action_figure animated_skeleton bedroom big_penis blue_blush blue_pussy blush blushing blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cleaning comic comic_page comic_panel cum cum_in_sex_toy cum_leaking cuntboy digital_media_(artwork) drawer ectopenis edit edited ejaculation elemental_creature elemental_humanoid english_text fire_elemental fleshlight fontcest genitals gloves grillby hooded_jacket hoodie huge_penis humanoid incest indoors intraspecies jacket large_filesize leaking_cum long_image male male/cuntboy male_only messy_room monochrome monster monster_boy multiple_images nsfwgarbagedump orange_blush orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored penetrable_sex_toy penetration penis pocket_pussy portal_fleshlight portal_sex pussy sans sans_(undertale) seme_papyrus sequence sequential sex sex_toy sex_toy_penetration sibling_incest siblings sitting skeleton stairs talking tall_image tears text third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games yaoi
1girl 2boys 2d 2d_(artwork) 2d_animation alphys animated_skeleton anthro basho_lizard blue_tongue bottom_sans crying digital_media_(artwork) dinosaur dinosaur_girl drooling floor fluids from_above gif glasses hoodie large_filesize lizard lizard_girl lizard_tail male_focus malesub monster monster_boy monster_girl papyrus papyrus_(undertale) penetration pixiv_id_7835302 red_tentacles reptile reptile_girl reptile_tail sans sans_(undertale) scalie scalie_female scared sex shocked siblings skeleton solo_focus submissive submissive_male tail tears tentacle tentacle_on_male tentacle_rape tentacle_sex tentacles_around_legs tongue trio uke_sans undead undertale undertale_(series) video_game_character video_games wide_eyed yellow_body yellow_skin
1girl 2boys 2d 2d_(artwork) 2d_animation alphys animated_skeleton anthro basho_lizard blue_tongue bottom_sans crying digital_media_(artwork) dinosaur dinosaur_girl drooling floor fluids from_above gif glasses hoodie large_filesize lizard lizard_girl lizard_tail male_focus malesub monster monster_boy monster_girl papyrus papyrus_(undertale) penetration pixiv_id_7835302 red_tentacles reptile reptile_girl reptile_tail sans sans_(undertale) scalie scalie_female scared sex shocked siblings skeleton solo_focus submissive submissive_male tail tears tentacle tentacle_on_male tentacle_rape tentacle_sex tentacles_around_legs tongue trio uke_sans undead undertale undertale_(series) video_game_character video_games wide_eyed yellow_body yellow_skin
2020s 2023 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_belly blue_blush blush bodily_fluids boner_blossom bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing digital_media_(artwork) drooling duo ectobelly ectopenis english_text fantasizing fontcest genitals hooded_jacket hoodie humanoid imagining implied_penetration implied_sex incest intraspecies jacket line_art lineart looking_at_genitalia looking_at_penis male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pleasure_face precum precum_drip profanity sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sweat text thought_bubble top_papyrus twitter twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games white_background yaoi
2020s 2023 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_belly blue_blush blush bodily_fluids boner_blossom bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing digital_media_(artwork) drooling duo ectobelly ectopenis english_text fantasizing fontcest genitals hooded_jacket hoodie humanoid imagining implied_penetration implied_sex incest intraspecies jacket line_art lineart looking_at_genitalia looking_at_penis male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pleasure_face precum precum_drip profanity sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sweat text thought_bubble top_papyrus twitter twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games white_background yaoi
2boys 2d 2d_(artwork) animated_skeleton bottom_sans bound clothed convenient_censoring convenient_censorship digital_media_(artwork) duo flowans flower flowey_the_flower flowsans gay implied_penetration interspecies korean_text male male/male male_only monochrome monster monster_boy mouth_forced_open plant plant_tentacle restrained sans sans_(undertale) seme_flowey simple_background skeleton soul soul_sex submissive tentacle tentacle_on_male tentacle_rape tentacle_sex tentacles_around_legs tentacles_on_male text top_flowey uke_sans undead undertale undertale_(series) ut-2828282928 video_game_character video_games vine_tentacles vines white_background yaoi
2boys 2d 2d_(artwork) animated_skeleton bottom_sans bound clothed convenient_censoring convenient_censorship digital_media_(artwork) duo flowans flower flowey_the_flower flowsans gay implied_penetration interspecies korean_text male male/male male_only monochrome monster monster_boy mouth_forced_open plant plant_tentacle restrained sans sans_(undertale) seme_flowey simple_background skeleton soul soul_sex submissive tentacle tentacle_on_male tentacle_rape tentacle_sex tentacles_around_legs tentacles_on_male text top_flowey uke_sans undead undertale undertale_(series) ut-2828282928 video_game_character video_games vine_tentacles vines white_background yaoi
2boys 2d 2d_(artwork) animated_skeleton bottom_sans bound clothed digital_media_(artwork) duo flowans flower flowey_the_flower flowsans gay interspecies looking_at_another looking_at_each_other looking_at_partner male male/male male_only monochrome monster monster_boy mouth_gag plant plant_tentacle restrained sans sans_(undertale) seme_flowey simple_background skeleton submissive tentacle tentacle_on_male tentacles_on_male top_flowey uke_sans undead undertale undertale_(series) ut-2828282928 video_game_character video_games vine_tentacles vines white_background yaoi
2boys 2d 2d_(artwork) animated_skeleton bottom_sans bound clothed digital_media_(artwork) duo flowans flower flowey_the_flower flowsans gay interspecies looking_at_another looking_at_each_other looking_at_partner male male/male male_only monochrome monster monster_boy mouth_gag plant plant_tentacle restrained sans sans_(undertale) seme_flowey simple_background skeleton submissive tentacle tentacle_on_male tentacles_on_male top_flowey uke_sans undead undertale undertale_(series) ut-2828282928 video_game_character video_games vine_tentacles vines white_background yaoi
2022 2d animated_skeleton black_censor_bar blue_hoodie blue_jacket blue_pussy bottom_sans censor_bar censored_pussy clothed digital_media_(artwork) ectoplasm ectopussy hooded_jacket hoodie imminent_penetration imminent_rape imminent_sex imminent_tentacle_rape jacket japanese_text logo_(pixiv_id_30462562) machine monster monster_boy partially_clothed partially_nude penetration pussy rape robotic_arm robotic_arms robotic_limbs robotic_parts sans sans_(undertale) skeleton socks_on solo solo_focus submissive sweat tentacle text uke_sans undead undertale undertale_(series)
2022 2d animated_skeleton black_censor_bar blue_hoodie blue_jacket blue_pussy bottom_sans censor_bar censored_pussy clothed digital_media_(artwork) ectoplasm ectopussy hooded_jacket hoodie imminent_penetration imminent_rape imminent_sex imminent_tentacle_rape jacket japanese_text logo_(pixiv_id_30462562) machine monster monster_boy partially_clothed partially_nude penetration pussy rape robotic_arm robotic_arms robotic_limbs robotic_parts sans sans_(undertale) skeleton socks_on solo solo_focus submissive sweat tentacle text uke_sans undead undertale undertale_(series)
2020s 2022 2d animated_skeleton black_censor_bar blue_hoodie blue_jacket blue_pussy bottom_sans censor_bar censored_pussy clothed digital_media_(artwork) ectoplasm ectopussy hooded_jacket hoodie jacket logo_(pixiv_id_30462562) machine monster monster_boy one_eye_closed partially_clothed partially_nude penetration rape robotic_arm robotic_arms robotic_limbs robotic_parts sans sans_(undertale) skeleton solo solo_focus submissive sweat tentacle tentacle_rape tentacle_sex uke_sans undead undertale undertale_(series)
2020s 2022 2d animated_skeleton black_censor_bar blue_hoodie blue_jacket blue_pussy bottom_sans censor_bar censored_pussy clothed digital_media_(artwork) ectoplasm ectopussy hooded_jacket hoodie jacket logo_(pixiv_id_30462562) machine monster monster_boy one_eye_closed partially_clothed partially_nude penetration rape robotic_arm robotic_arms robotic_limbs robotic_parts sans sans_(undertale) skeleton solo solo_focus submissive sweat tentacle tentacle_rape tentacle_sex uke_sans undead undertale undertale_(series)
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm eyes_wide_open fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm eyes_wide_open fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1cuntboy 2020s 2022 2boys 2d 2d_(artwork) absurd_res absurdres alternate_costume alternate_outfit animated_skeleton anon anonymous anonymous_male blue_pussy blush bottom_sans candy_cane christmas christmas_outfit cum cum_in_mouth cum_in_pussy cum_inside cuntboy cuntboy_focus cuntboy_penetrated cuntboysub dark-skinned_male digital_media_(artwork) ectoplasm ectopussy faceless_male genitals holidays insertion konoha6_(pixiv_id_1724049) large_filesize legs_apart male male/cuntboy male_penetrating male_penetrating_cuntboy monster monster_boy object_insertion partial_male penetration penis penis_in_mouth penis_in_pussy pussy sans sans_(undertale) santa_costume santa_hat santa_outfit santa_skirt sequence sequential sex skeleton solo_focus spitroast submissive sweat uke_sans undead undertale undertale_(series) unseen_male unseen_male_face vaginal vaginal_insertion vaginal_object_insertion vaginal_penetration vaginal_sex video_game_character video_games yaoi
1cuntboy 2020s 2022 2boys 2d 2d_(artwork) absurd_res absurdres alternate_costume alternate_outfit animated_skeleton anon anonymous anonymous_male blue_pussy blush bottom_sans candy_cane christmas christmas_outfit cum cum_in_mouth cum_in_pussy cum_inside cuntboy cuntboy_focus cuntboy_penetrated cuntboysub dark-skinned_male digital_media_(artwork) ectoplasm ectopussy faceless_male genitals holidays insertion konoha6_(pixiv_id_1724049) large_filesize legs_apart male male/cuntboy male_penetrating male_penetrating_cuntboy monster monster_boy object_insertion partial_male penetration penis penis_in_mouth penis_in_pussy pussy sans sans_(undertale) santa_costume santa_hat santa_outfit santa_skirt sequence sequential sex skeleton solo_focus spitroast submissive sweat uke_sans undead undertale undertale_(series) unseen_male unseen_male_face vaginal vaginal_insertion vaginal_object_insertion vaginal_penetration vaginal_sex video_game_character video_games yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2020s 2022 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton basho_lizard blue_tongue bodily_fluids bottom_sans clothed crying digital_media_(artwork) duo ectotongue flowans flower flowey_the_flower flowsans fluids interspecies male male/male male_only monster monster_boy pixiv_id_7835302 plant plant_tentacle sans sans_(undertale) seme_flowey sequence sequential skeleton soul_sex submissive sweat tears tentacle tentacle_on_male tentacles_under_clothes tongue tongue_out top_flowey trembling twitching uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi yellow_flower
2020s 2022 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton basho_lizard blue_tongue bodily_fluids bottom_sans clothed crying digital_media_(artwork) duo ectotongue flowans flower flowey_the_flower flowsans fluids interspecies male male/male male_only monster monster_boy pixiv_id_7835302 plant plant_tentacle sans sans_(undertale) seme_flowey sequence sequential skeleton soul_sex submissive sweat tears tentacle tentacle_on_male tentacles_under_clothes tongue tongue_out top_flowey trembling twitching uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi yellow_flower
2020s 2022 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton basho_lizard bottom_sans clothed digital_media_(artwork) duo flowans flower flowey_the_flower flowsans interspecies male male/male male_only monster monster_boy pixiv_id_7835302 plant plant_tentacle sans sans_(undertale) seme_flowey sequence sequential skeleton soul_sex submissive sweat tentacle tentacle_on_male tentacles_under_clothes top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi yellow_flower
2020s 2022 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton basho_lizard bottom_sans clothed digital_media_(artwork) duo flowans flower flowey_the_flower flowsans interspecies male male/male male_only monster monster_boy pixiv_id_7835302 plant plant_tentacle sans sans_(undertale) seme_flowey sequence sequential skeleton soul_sex submissive sweat tentacle tentacle_on_male tentacles_under_clothes top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi yellow_flower
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton blood blue_blush blush bottom_sans claws clothed crying digital_media_(artwork) domination drooling duo flowans flower flowey_the_flower flowsans hoodie injury interspecies japanese_text logo_(pixiv_id_30462562) male monster monster_boy one_eye_closed penetration pinned_down plant plant_tentacle plant_tentacles rape sans sans_(undertale) seme_flowey sex skeleton solo_focus submissive sweat tears tentacle tentacle_in_mouth tentacle_rape tentacle_sex tentacles_around_legs text top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton blood blue_blush blush bottom_sans claws clothed crying digital_media_(artwork) domination drooling duo flowans flower flowey_the_flower flowsans hoodie injury interspecies japanese_text logo_(pixiv_id_30462562) male monster monster_boy one_eye_closed penetration pinned_down plant plant_tentacle plant_tentacles rape sans sans_(undertale) seme_flowey sex skeleton solo_focus submissive sweat tears tentacle tentacle_in_mouth tentacle_rape tentacle_sex tentacles_around_legs text top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vines white_background yaoi