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2020s 2023 2boys 2d 2d_(artwork) animated_skeleton artist_name beetleevil blue_blush blue_tongue blush blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing commision commision_art completely_nude completely_nude_male crying dazed digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue edit edited english_text evilbeetle fontcest from_front_position genitals grabbing_leg heart-shaped_pupils heart_eyes incest intraspecies large_filesize long_image male male/male male_only maledom malesub monster monster_boy multiple_images nude nude_male orange_blush orange_penis overstimulation papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton sketch speech_bubble submissive submissive_male tall_image tears text text_bubble third-party_edit thrusting tongue top_papyrus trembling trembling_legs twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

2020s 2023 2boys 2d 2d_(artwork)animated_skeleton artist_name beetleevil blue_blush blue_tongue blush blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing commision commision_art completely_nude completely_nude_male crying dazed digital_media_(artwork)dominant dominant_male duo ectopenis ectoplasm ectotongue edit edited english_text evilbeetle fontcest from_front_position genitals grabbing_leg heart-shaped_pupils heart_eyes incest intraspecies large_filesize long_image male male/male male_only maledom malesub monster monster_boy multiple_images nude nude_male orange_blush orange_penis overstimulation papyrus papyrus_(undertale)papysans partially_colored penetration penis sans sans_(undertale)seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton sketch speech_bubble submissive submissive_male tall_image tears text text_bubble third-party_edit thrusting tongue top_papyrus trembling trembling_legs twitter uke_sans undead undertale undertale_(series)video_game_character video_games yaoi

2020s 2023 2boys 2d 2d_(artwork) animated_skeleton artist_name beetleevil blue_blush blue_tongue blush blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing commision commision_art completely_nude completely_nude_male crying dazed digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue edit edited english_text evilbeetle fontcest from_front_position genitals grabbing_leg heart-shaped_pupils heart_eyes incest intraspecies large_filesize long_image male male/male male_only maledom malesub monster monster_boy multiple_images nude nude_male orange_blush orange_penis overstimulation papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton sketch speech_bubble submissive submissive_male tall_image tears text text_bubble third-party_edit thrusting tongue top_papyrus trembling trembling_legs twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

2020s 2023 2boys animated_skeleton bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_hoodie blue_jacket boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers duo ectopenis ectoplasm fellatio fellatio_pov fontcest hooded_jacket hoodie humanoid incest indoors intraspecies jacket japanese_text larger_male licking licking_balls licking_penis licking_testicles male male/male male_focus male_only male_penetrating male_pov monster monster_boy papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pov red_boots red_penis s2ames2 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus text top_papyrus trembling trembling_legs uke_sans undead undertale undertale_(series) unseen_male_face yaoi

2020s 2023 2boys 2d 2d_(artwork) anal animated_skeleton artist_name beetleevil blue_blush blue_tongue blush blushing_male bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing commision commision_art completely_nude completely_nude_male crying dazed digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue english_text evilbeetle fontcest from_front_position genitals grabbing_leg incest intraspecies male male/male male_only maledom malesub monster monster_boy nude nude_male orange_blush orange_penis overstimulation papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton sketch speech_bubble submissive submissive_male tears text text_bubble thrusting tongue top_papyrus trembling trembling_legs twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi