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2010s 2018 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brother brother_and_brother brothers clothed clothed/nude clothed_male crying crying_with_eyes_open cum cum_on_face cumshot digital_media_(artwork) duo ectopenis ejaculation fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt lowest_of_dirt male male_only male_penetrating monster monster_boy mouth_gag naked nude nude_male papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi

2010s 2018 2boys 2d 2d_(artwork)alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brother brother_and_brother brothers clothed clothed/nude clothed_male crying crying_with_eyes_open cum cum_on_face cumshot digital_media_(artwork)duo ectopenis ejaculation fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt lowest_of_dirt male male_only male_penetrating monster monster_boy mouth_gag naked nude nude_male papyrus papyrus_(undertale)papysans partially_colored penetration penis sans sans_(undertale)seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus twitter uke_sans undead undertale undertale_(series)unseen_male_face video_game_character video_games yaoi

2010s 2018 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brother brother_and_brother brothers clothed clothed/nude clothed_male crying crying_with_eyes_open cum cum_on_face cumshot digital_media_(artwork) duo ectopenis ejaculation fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt lowest_of_dirt male male_only male_penetrating monster monster_boy mouth_gag naked nude nude_male papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi

2010s 2018 2boys 2d 2d_(artwork) alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brother brother_and_brother brothers clothed clothed/nude clothed_male crying crying_with_eyes_open digital_media_(artwork) duo ectopenis fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt lowest_of_dirt male male_only male_penetrating monster monster_boy mouth_gag naked nude nude_male papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi

1boy 2021 2d 2d_(artwork) animated_skeleton arms_behind_back blue_blush blush bottom_sans bound_wrists digital_media_(artwork) gradient_background grey_background humanoid kneel looking_at_viewer male male_only meridasia monster monster_boy nude nude_male sacrum_lacing sans sans_(undertale) simple_background skeleton tied_arms tied_up tied_wrists uke_sans undead undertale undertale_(series) video_game_character video_games