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2010s 2018 2boys 2d 2d_(artwork) alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi

2010s 2018 2boys 2d 2d_(artwork)alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125)monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus papyrus_(undertale)papysans penetration penis sans sans_(undertale)seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series)vest video_games white_background yaoi

2010s 2018 2boys 2d 2d_(artwork) alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi

1boy 2010s 2015 animated_skeleton artist_name blue_blush blue_penis blue_tongue blush bodily_fluids bondage bottom_sans chair clothed clothing cum cussing ectopenis ectotongue english_text fluids formal formal_clothes formal_wear hand hand_on_crotch male male_focus malesub monster neck_tie necktie office_chair partially_colored penis penis_out penis_through_fly profanity sans sans_(undertale) sitting sitting_on_chair skeleton solo_focus submissive submissive_male swearing sweat text tied_up tomorobo tongue tongue_out uke_sans unbuttoned unbuttoned_shirt undead undertale undertale_(series) undertale_fanfiction vest white_background

2010s 2016 2boys 2d 2d_(artwork) amortem-kun animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_slippers blush boots bottom_sans brother brother/brother brother_and_brother brothers chair clothed clothing couch digital_media_(artwork) duo ectotongue fontcest formal formal_clothes formal_wear furniture gloves green_couch hand_in_pocket hands_on_hips height_difference hooded_jacket hoodie incest jacket kissing larger_male licking licking_neck male male/male male_only monster monster_boy multiple_views neck_tie necktie necktie_grab orange_blush orange_necktie orange_tongue papyrus papyrus_(undertale) papysans red_boots red_gloves sans sans_(undertale) seme_papyrus shoes shorter_male sibling_incest siblings simple_background sitting_on_couch sitting_on_sofa size_difference skeleton slippers small_sub smaller_male smaller_sub smaller_sub_bigger_dom sofa standing standing_on_chair standing_on_stool stool suit taller_male top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi