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2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed comic digital_media_(artwork) duo ectotongue edit edited fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies long_image making_out male male/male male_only monochrome monster monster_boy multiple_images on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_colored saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton tall_image text text_bubble third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) veah-3sin video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed comic digital_media_(artwork) duo ectotongue edit edited fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies long_image making_out male male/male male_only monochrome monster monster_boy multiple_images on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_colored saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton tall_image text text_bubble third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) veah-3sin video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed comic digital_media_(artwork) duo ectotongue fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies making_out male male/male male_only monochrome monster monster_boy on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton text text_bubble top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed comic digital_media_(artwork) duo ectotongue fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies making_out male male/male male_only monochrome monster monster_boy on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton text text_bubble top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom bottom_sans brother/brother brothers chinese_text clothed comic digital_media_(artwork) duo fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies male male/male male_only monochrome monster monster_boy on_bed papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veah-3sin video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom bottom_sans brother/brother brothers chinese_text clothed comic digital_media_(artwork) duo fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies male male/male male_only monochrome monster monster_boy on_bed papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veah-3sin video_games yaoi
1boy 1cuntboy 2010s 2017 animated_skeleton begging_to_stop blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed_male comic comic_page comic_panel couch_sex cuntboy cuntboysub dominant dominant_male domination dubious_consent duo ectobody ectopenis ectopussy english_text fontcest from_front_position gay glowing_eye incest intraspecies leg_over_shoulder male male/cuntboy male_penetrating maledom missionary_position monster monster_boy onomatopoeia orange_blush orange_penis pants_around_one_leg papyrus papyrus_(undertale) papysans penetration penis_through_fly pleading profanity pussy questionable_consent rape sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_couch sibling_incest siblings skeleton sofa speech_bubble submissive submissive_cuntboy supermuuh text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants veiny_penis yandere yaoi
1boy 1cuntboy 2010s 2017 animated_skeleton begging_to_stop blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed_male comic comic_page comic_panel couch_sex cuntboy cuntboysub dominant dominant_male domination dubious_consent duo ectobody ectopenis ectopussy english_text fontcest from_front_position gay glowing_eye incest intraspecies leg_over_shoulder male male/cuntboy male_penetrating maledom missionary_position monster monster_boy onomatopoeia orange_blush orange_penis pants_around_one_leg papyrus papyrus_(undertale) papysans penetration penis_through_fly pleading profanity pussy questionable_consent rape sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_couch sibling_incest siblings skeleton sofa speech_bubble submissive submissive_cuntboy supermuuh text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants veiny_penis yandere yaoi
2010s 2017 animated_skeleton begging_to_stop blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed comic comic_page comic_panel crying dominant dominant_male domination duo english_text fontcest glowing_eye incest intraspecies male male_only maledom monster monster_boy non-con non-consensual noncon nonconsensual papyrus papyrus_(undertale) papysans pleading sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton soul soul_sex speech_bubble submissive supermuuh tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) yandere yaoi
2010s 2017 animated_skeleton begging_to_stop blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed comic comic_page comic_panel crying dominant dominant_male domination duo english_text fontcest glowing_eye incest intraspecies male male_only maledom monster monster_boy non-con non-consensual noncon nonconsensual papyrus papyrus_(undertale) papysans pleading sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton soul soul_sex speech_bubble submissive supermuuh tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) yandere yaoi
2010s 2017 animated_skeleton blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers comic comic_page comic_panel dominant dominant_male domination duo ectotongue english_text fontcest gay glowing_eye incest intraspecies licking male male_only maledom monster monster_boy non-con non-consensual noncon nonconsensual orange_tongue papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton soul soul_sex speech_bubble submissive supermuuh text text_bubble top_papyrus uke_sans undead undertale undertale_(series) yandere yaoi
2010s 2017 animated_skeleton blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers comic comic_page comic_panel dominant dominant_male domination duo ectotongue english_text fontcest gay glowing_eye incest intraspecies licking male male_only maledom monster monster_boy non-con non-consensual noncon nonconsensual orange_tongue papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton soul soul_sex speech_bubble submissive supermuuh text text_bubble top_papyrus uke_sans undead undertale undertale_(series) yandere yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex sweat text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark x-ray yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex sweat text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark x-ray yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex sweat text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex sweat text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games visible_breath watermark x-ray yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games visible_breath watermark x-ray yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games visible_breath watermark yaoi
2010s 2016 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outside papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games visible_breath watermark yaoi
... 1boy 1cuntboy 2010s 2018 2d 2d_(artwork) anger_vein animated_skeleton artist_name blue_blush blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male duo ectopussy ectotongue edit edited english_text fontcest frustrated humanoid imminent_penetration incest intraspecies joke long_image male male/cuntboy maledom monster monster_boy multiple_images orange_blush orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slimeybonez solo_focus speech_bubble spoken_ellipsis submissive submissive_cuntboy talking tall_image tentacle tentacle_penetration tentacle_sex tentacles_around_legs tentacles_around_wrists text text_bubble third-party_edit tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) upper_body video_game_character video_games white_background yaoi
... 1boy 1cuntboy 2010s 2018 2d 2d_(artwork) anger_vein animated_skeleton artist_name blue_blush blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male duo ectopussy ectotongue edit edited english_text fontcest frustrated humanoid imminent_penetration incest intraspecies joke long_image male male/cuntboy maledom monster monster_boy multiple_images orange_blush orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slimeybonez solo_focus speech_bubble spoken_ellipsis submissive submissive_cuntboy talking tall_image tentacle tentacle_penetration tentacle_sex tentacles_around_legs tentacles_around_wrists text text_bubble third-party_edit tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) upper_body video_game_character video_games white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_tongue blush bottom_sans bound brothers clothed cuntboy cuntboy_focus cuntboysub ectotongue english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_tongue blush bottom_sans bound brothers clothed cuntboy cuntboy_focus cuntboysub ectotongue english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboy_penetrated cuntboysub ectopussy english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle tentacle_penetration tentacle_sex text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboy_penetrated cuntboysub ectopussy english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle tentacle_penetration tentacle_sex text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboysub ectopussy english_text fontcest humanoid imminent_penetration incest intraspecies joke male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboysub ectopussy english_text fontcest humanoid imminent_penetration incest intraspecies joke male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
... 1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans bound brother brother/brother brother_and_brother brothers clothed cuntboy cuntboysub digital_media_(artwork) dominant dominant_male english_text fontcest frustrated humanoid incest intraspecies joke male/cuntboy male_focus maledom monster monster_boy orange_blush orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pun sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus spoken_ellipsis submissive submissive_cuntboy tentacle text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character upper_body video_game_character video_games white_background yaoi
... 1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans bound brother brother/brother brother_and_brother brothers clothed cuntboy cuntboysub digital_media_(artwork) dominant dominant_male english_text fontcest frustrated humanoid incest intraspecies joke male/cuntboy male_focus maledom monster monster_boy orange_blush orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pun sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus spoken_ellipsis submissive submissive_cuntboy tentacle text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character upper_body video_game_character video_games white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blush bottom_sans bound brothers clothed cuntboy cuntboy_focus cuntboysub english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus speech_bubble submissive submissive_cuntboy tentacle text text_bubble top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blush bottom_sans bound brothers clothed cuntboy cuntboy_focus cuntboysub english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus speech_bubble submissive submissive_cuntboy tentacle text text_bubble top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboysub ectopussy english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle tentacles_around_legs tentacles_around_wrists top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy cuntboy_focus cuntboysub ectopussy english_text fontcest humanoid incest intraspecies male/cuntboy monster monster_boy orange_tentacles papyrus papyrus_(undertale) papysans partially_colored pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton slimeybonez solo_focus submissive submissive_cuntboy tentacle tentacles_around_legs tentacles_around_wrists top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background yaoi
!!! 2010s 2018 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male covering_own_mouth cum deepthroat digital_media_(artwork) duo ectopenis ectotongue edit edited english_text fellatio fontcest hand_on_another's_head hand_on_head imminent_fellatio imminent_oral incest intraspecies larger_male licking_penis long_image male male/male male_moaning male_only moaning monster monster_boy multiple_images oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton solo_focus spoken_exclamation_mark sucking_penis talking talking_to_another talking_to_partner tall_image text theyaois third-party_edit tongue top_papyrus trembling twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
!!! 2010s 2018 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male covering_own_mouth cum deepthroat digital_media_(artwork) duo ectopenis ectotongue edit edited english_text fellatio fontcest hand_on_another's_head hand_on_head imminent_fellatio imminent_oral incest intraspecies larger_male licking_penis long_image male male/male male_moaning male_only moaning monster monster_boy multiple_images oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton solo_focus spoken_exclamation_mark sucking_penis talking talking_to_another talking_to_partner tall_image text theyaois third-party_edit tongue top_papyrus trembling twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male cum cum_in_mouth cum_on_tongue digital_media_(artwork) duo ectotongue english_text fontcest gay hand_on_another's_face hand_on_cheek hand_on_face hands_on_another's_face hands_on_cheeks hands_on_face incest intraspecies male male/male male_only monster monster_boy orange_blush papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton solo_focus talking_to_another talking_to_partner text theyaois tongue tongue_out top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male cum cum_in_mouth cum_on_tongue digital_media_(artwork) duo ectotongue english_text fontcest gay hand_on_another's_face hand_on_cheek hand_on_face hands_on_another's_face hands_on_cheeks hands_on_face incest intraspecies male male/male male_only monster monster_boy orange_blush papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton solo_focus talking_to_another talking_to_partner text theyaois tongue tongue_out top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath white_background yaoi
!!! 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male deepthroat digital_media_(artwork) duo ectopenis ectotongue english_text fellatio fontcest gay incest intraspecies larger_male male male/male male_only monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton solo_focus spoken_exclamation_mark talking_to_another talking_to_partner text theyaois tongue top_papyrus trembling twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
!!! 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male deepthroat digital_media_(artwork) duo ectopenis ectotongue english_text fellatio fontcest gay incest intraspecies larger_male male male/male male_only monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton solo_focus spoken_exclamation_mark talking_to_another talking_to_partner text theyaois tongue top_papyrus trembling twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male digital_media_(artwork) duo ectopenis ectotongue english_text fellatio fontcest hand_on_another's_head incest intraspecies larger_male licking_penis male male/male male_moaning male_only moaning monster monster_boy oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton solo_focus sucking_penis talking_to_another talking_to_partner text theyaois tongue top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male digital_media_(artwork) duo ectopenis ectotongue english_text fellatio fontcest hand_on_another's_head incest intraspecies larger_male licking_penis male male/male male_moaning male_only moaning monster monster_boy oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton solo_focus sucking_penis talking_to_another talking_to_partner text theyaois tongue top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male covering_own_mouth digital_media_(artwork) duo ectopenis ectotongue english_text fontcest hand_on_another's_head hand_on_head imminent_fellatio imminent_oral incest intraspecies larger_male male male/male male_only monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton talking_to_another talking_to_partner text theyaois tongue top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blue_tongue blush bottom_sans brothers clothed clothed_male covering_own_mouth digital_media_(artwork) duo ectopenis ectotongue english_text fontcest hand_on_another's_head hand_on_head imminent_fellatio imminent_oral incest intraspecies larger_male male male/male male_only monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton talking_to_another talking_to_partner text theyaois tongue top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner tall_image text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner tall_image text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy drooling duo ectopenis ectopussy english_text fontcest heart-shaped_pupils hugged_from_behind hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy moaning monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton smaller_penetrated speech_bubble text text_bubble theyaois thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy drooling duo ectopenis ectopussy english_text fontcest heart-shaped_pupils hugged_from_behind hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy moaning monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton smaller_penetrated speech_bubble text text_bubble theyaois thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers carrying carrying_another carrying_partner clothed clothed_male digital_media_(artwork) duo ectopenis english_text fontcest from_behind heart-shaped_pupils imminent_sex incest intraspecies larger_male male male/male male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pink_slippers sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton slippers talking_to_another talking_to_partner text theyaois top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers carrying carrying_another carrying_partner clothed clothed_male digital_media_(artwork) duo ectopenis english_text fontcest from_behind heart-shaped_pupils imminent_sex incest intraspecies larger_male male male/male male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pink_slippers sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton slippers talking_to_another talking_to_partner text theyaois top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2d after_sex animated_skeleton blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cum_in_pussy cuntboy cuntboysub digital_media dominant_male duo ectopussy edit fontcest humanoid implied_penetration implied_sex implied_vaginal incest long_image male male/cuntboy male_focus maledom monster monster_boy multiple_images nude orange_blush papyrus_(undertale) papysans pussy sans_(undertale) sequential sibling_incest siblings sinfulsanspar skeleton sleep_sex sleeping solo_focus somnophilia submissive_cuntboy sweat tall_image third-party_edit top-down_bottom-up top_papyrus undead undertale undertale_(series) upper_body video_games visible_breath wide_eyed yaoi
1boy 1cuntboy 2d after_sex animated_skeleton blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cum_in_pussy cuntboy cuntboysub digital_media dominant_male duo ectopussy edit fontcest humanoid implied_penetration implied_sex implied_vaginal incest long_image male male/cuntboy male_focus maledom monster monster_boy multiple_images nude orange_blush papyrus_(undertale) papysans pussy sans_(undertale) sequential sibling_incest siblings sinfulsanspar skeleton sleep_sex sleeping solo_focus somnophilia submissive_cuntboy sweat tall_image third-party_edit top-down_bottom-up top_papyrus undead undertale undertale_(series) upper_body video_games visible_breath wide_eyed yaoi
1boy 2017 2d animated_skeleton blush clothed clothed/nude clothed_male digital_media fontcest humanoid implied_incest implied_penetration implied_sex implied_yaoi incest male male/cuntboy male_focus male_only monster monster_boy orange_blush papyrus_(undertale) papysans sinfulsanspar skeleton solo_focus somnophilia sweat top_papyrus undead undertale undertale_(series) upper_body video_games visible_breath yaoi
1boy 2017 2d animated_skeleton blush clothed clothed/nude clothed_male digital_media fontcest humanoid implied_incest implied_penetration implied_sex implied_yaoi incest male male/cuntboy male_focus male_only monster monster_boy orange_blush papyrus_(undertale) papysans sinfulsanspar skeleton solo_focus somnophilia sweat top_papyrus undead undertale undertale_(series) upper_body video_games visible_breath yaoi
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2020s 2021 2boys 2d 2d_(artwork) 2males abosinsin anal animated_skeleton bad_id bad_twitter_id big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blue_tongue blush boots bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_sex digital_media_(artwork) duo ectopenis ectotongue edit edited erect_while_penetrated erection fontcest gay genitals hand_on_another's_shoulder hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart looking_pleasured lying_down male male/male male_only male_penetrated male_penetrating male_penetrating_male moaning monster monster_boy open_mouth orange_blush orange_penis overstimulation papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penis penis_size_difference pleasure_face sans sans_(undertale) seme_papyrus service_top sex sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_penis smaller_male smaller_penetrated smooth_penis sweat tears tears_of_pleasure text third-party_edit tongue tongue_grab tongue_out top_papyrus twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games x-ray yaoi
2020s 2021 2boys 2d 2d_(artwork) 2males abosinsin anal animated_skeleton bad_id bad_twitter_id big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blue_tongue blush boots bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_sex digital_media_(artwork) duo ectopenis ectotongue edit edited erect_while_penetrated erection fontcest gay genitals hand_on_another's_shoulder hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart looking_pleasured lying_down male male/male male_only male_penetrated male_penetrating male_penetrating_male moaning monster monster_boy open_mouth orange_blush orange_penis overstimulation papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penis penis_size_difference pleasure_face sans sans_(undertale) seme_papyrus service_top sex sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_penis smaller_male smaller_penetrated smooth_penis sweat tears tears_of_pleasure text third-party_edit tongue tongue_grab tongue_out top_papyrus twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games x-ray yaoi
1boy 1cuntboy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name artist_watermark blue_blush blue_eye blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant_male duo ectopenis ectopussy english_text fontcest gay glowing glowing_eye glowing_genitalia glowing_penis glowing_pussy incest intraspecies laddinger leg_lift legs_up line_art lineart male male/cuntboy male_out_of_frame maledom monster monster_boy naked nude orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis pussy sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive_cuntboy sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games watermark white_background yaoi
1boy 1cuntboy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name artist_watermark blue_blush blue_eye blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant_male duo ectopenis ectopussy english_text fontcest gay glowing glowing_eye glowing_genitalia glowing_penis glowing_pussy incest intraspecies laddinger leg_lift legs_up line_art lineart male male/cuntboy male_out_of_frame maledom monster monster_boy naked nude orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis pussy sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive_cuntboy sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games watermark white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_tumblr_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo ectopenis fontcest gay grabbing_from_behind grabbing_mouth inactive_account incest larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy noxiousaberration nude open_mouth orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_tumblr_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo ectopenis fontcest gay grabbing_from_behind grabbing_mouth inactive_account incest larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy noxiousaberration nude open_mouth orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
>:o 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media_(artwork) duo english_text fontcest gloves grabbing_another's_chin grabbing_face hooded_jacket hoodie implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus papyrus_(undertale) papysans profanity red_gloves red_sweater sans sans_(undertale) seme_papyrus skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
>:o 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media_(artwork) duo english_text fontcest gloves grabbing_another's_chin grabbing_face hooded_jacket hoodie implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus papyrus_(undertale) papysans profanity red_gloves red_sweater sans sans_(undertale) seme_papyrus skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi