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2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth text theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi

2010s 2017 2boys 2d 2d_(artwork)alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork)dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus papyrus_(undertale)papysans penis penis_out precum questionable_consent red_gloves red_scarf sans sans_(undertale)santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth text theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series)video_game_character video_games yandere yaoi

2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth text theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi

1boy 1cuntboy 2010s 2016 2d 2d_(artwork) ahegao animated_skeleton artist_name blue_blush blue_body blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brother_penetrating_brother brothers brown_background carrying carrying_partner carrying_position clothed clothing cuntboy cuntboy_penetrated digital_media_(artwork) duo ectobody ectopenis ectoplasm ectopussy ectotongue english_text fangs fontcest gasterass genitals gradient_legwear heart-shaped_pupils incest intraspecies legwear male male/cuntboy male_penetrating male_penetrating_cuntboy monster monster_boy nude orange_body orange_penis orange_tongue orsnge_blush papyrus papyrus_(undertale) papysans penetration penis pleasure_face profanity pussy sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton solid_color_background speech_bubble stockings talking talking_to_another talking_to_partner text thighhighs tongue tongue_out top_papyrus topwear two-tone_legwear two_tone_legwear uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi

2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton bed 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 completely_nude completely_nude_male digital_media_(artwork) duo ectopenis ectoplasm fluids fontcest from_front_position genitals goma_dango_555 incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_on_back lying_on_bed male male_only male_penetrating missionary_position monster monster_boy nude nude_male on_back on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_front penis pillow pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears toony top_papyrus trembling uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath yaoi