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2010s 2018 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_panel comic_sans couch drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves incest larger_penetrating larger_penetrating_smaller long_gloves male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text text_bubble thought_bubble top_papyrus topwear uke_sans undead undertale undertale_(series) yaoi

2010s 2018 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_panel comic_sans couch drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves incest larger_penetrating larger_penetrating_smaller long_gloves male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus papyrus_(font)papyrus_(undertale)papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans sans_(undertale)scarf seme_papyrus sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text text_bubble thought_bubble top_papyrus topwear uke_sans undead undertale undertale_(series)yaoi

2010s 2018 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_panel comic_sans couch drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves incest larger_penetrating larger_penetrating_smaller long_gloves male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text text_bubble thought_bubble top_papyrus topwear uke_sans undead undertale undertale_(series) yaoi

2010s 2017 2d 2d_(artwork) animated_skeleton blue_blush blush bottom_on_top bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers comic_sans digital_media_(artwork) duo ectopenis english_text fontcest gloves gradient_background holding_hands hoodie incest interlocked_fingers intertwined_fingers looking_at_viewer male male_focus male_only male_penetrating male_pov mmmemmo monster monster_boy onomatopoeia orange_penis papyrus papyrus_(undertale) papysans partial_male penetrating_pov penetration penetrator_pov penis pov power_bottom red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games yaoi yellow_background

1boy 2010s 2018 2d 2d_(artwork) animated_skeleton artist_name bottom_on_top bottom_sans digital_media_(artwork) grinding heki_(miss60250) looking_down male male_focus male_only monster monster_boy power_bottom precum sans sans_(undertale) skeleton smile third-party_source uke_sans undead undertale undertale_(series) video_games white_background yaoi