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2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton bigger_penetrating bigger_penetrating_smaller black_background blue_blush blue_tongue blush bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers censored censored_penis clothed completely_nude crying crying_with_eyes_open duo ectopenis ectoplasm ectotongue fontcest goma_dango_555 incest intraspecies larger_penetrating larger_penetrating_smaller male male_only male_penetrating male_pov monster monster_boy nude orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetrating_pov penetration penetrator_pov penis pixiv_id_49095896 pov power_bottom pussy riding riding_penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton smaller_penetrated socks socks_on solo_focus tears tongue tongue_out toony top_papyrus trembling uke_sans undead undertale undertale_(series) unseen_male_face video_games visible_breath white_censor_bar yaoi

2020s 2021 2boys 2d 2d_(artwork)anal animated_skeleton bigger_penetrating bigger_penetrating_smaller black_background blue_blush blue_tongue blush bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers censored censored_penis clothed completely_nude crying crying_with_eyes_open duo ectopenis ectoplasm ectotongue fontcest goma_dango_555 incest intraspecies larger_penetrating larger_penetrating_smaller male male_only male_penetrating male_pov monster monster_boy nude orange_blush orange_penis papyrus papyrus_(undertale)papysans partially_clothed penetrating_pov penetration penetrator_pov penis pixiv_id_49095896 pov power_bottom pussy riding riding_penis sans sans_(undertale)seme_papyrus sex sibling_incest siblings simple_background skeleton smaller_penetrated socks socks_on solo_focus tears tongue tongue_out toony top_papyrus trembling uke_sans undead undertale undertale_(series)unseen_male_face video_games visible_breath white_censor_bar yaoi

2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton bigger_penetrating bigger_penetrating_smaller black_background blue_blush blue_tongue blush bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers censored censored_penis clothed completely_nude crying crying_with_eyes_open duo ectopenis ectoplasm ectotongue fontcest goma_dango_555 incest intraspecies larger_penetrating larger_penetrating_smaller male male_only male_penetrating male_pov monster monster_boy nude orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetrating_pov penetration penetrator_pov penis pixiv_id_49095896 pov power_bottom pussy riding riding_penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton smaller_penetrated socks socks_on solo_focus tears tongue tongue_out toony top_papyrus trembling uke_sans undead undertale undertale_(series) unseen_male_face video_games visible_breath white_censor_bar yaoi

2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo ectopenis ectotongue fontcest from_front_position goma_dango_555 green_socks incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller making_out male male_only male_penetrating monster monster_boy orange_blush orange_socks orange_tongue papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_front penis pixiv_id_49095896 power_bottom saliva saliva_trail sans sans_(undertale) seme_papyrus sex sex_from_front sibling_incest siblings simple_background skeleton smaller_penetrated socks socks_on solid_color_background sweat tongue tongue_out toony top_papyrus topwear uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath yaoi

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