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2020s 2022 2boys 2d 2d_(artwork)anal animated_skeleton bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork)duo fontcest from_front_position goma_dango_555 incest indoors intraspecies kissing kneeling larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy on_bed orange_blush papyrus papyrus_(undertale)papysans partially_clothed penetration pixiv_id_49095896 sans sans_(undertale)seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series)unseen_male_face video_game_character video_games yaoi

2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo fontcest from_front_position goma_dango_555 incest indoors intraspecies kissing kneeling larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy on_bed orange_blush papyrus papyrus_(undertale) papysans partially_clothed penetration pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi

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2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothes_lift crying digital_media_(artwork) duo ectopenis ectoplasm ectotongue fontcest from_front_position goma_dango_555 incest intraspecies larger_penetrating larger_penetrating_smaller making_out male male_only male_penetrating mastery_position monster monster_boy orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_colored penetration penetration_from_front penis pixiv_id_49095896 riding riding_penis sans sans_(undertale) seme_papyrus sex sex_from_front shirt_lift sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on sweat tears tongue tongue_out toony top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi