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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 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 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