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2021 2boys 2d 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 bottomwear brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex clothing digital_media duo ectopenis erection fontcest goma_dango_555 holding_hands incest interlocked_fingers intertwined_fingers intraspecies japanese_text kneeling larger_penetrating larger_penetrating_smaller making_out male male_only male_penetrating monster monster_boy off_shoulder orange_blush pants pants_around_one_leg papyrus_(undertale) papysans partially_clothed penetration penis sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on text toony top_papyrus topwear uke_sans undead undertale undertale_(series) video_game_character video_games white_background x-ray yaoi
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1boy 1cuntboy 2023 2d animated_skeleton aokisk artist_name big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy bottomless_male brother/brother brother_penetrating_brother brothers clitoris clothed clothing crying crying_with_eyes_open cuntboy cuntboy_penetrated digital_media drooling duo ectopenis ectopussy english_text fontcest from_behind_position genitals gloves grey_background grey_socks hand_under_clothes holding_hand incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy male_only male_penetrating male_penetrating_cuntboy monster monster_boy orange_blush orange_eye orange_penis papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis pussy red_gloves riding riding_penis sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background sitting skeleton smaller_cuntboy smaller_penetrated socks speech_bubble talking_to_another talking_to_partner tears teeth text tongue tongue_out top_papyrus topwear twitter_username undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
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2018 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_eyes blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing crying crying_with_eyes_open dominant dominant_male duo ectotongue fontcest from_behind_position glowing grabbing grabbing_clothing grabbing_from_behind heart-shaped_pupils heart_eyes humanoid incest intraspecies larger_male male male/male male_focus male_only maledom malesub monster open_mouth papyrus_(undertale) papysans penetration penetration_from_behind pleasure_face realdemdemdmensfw sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male tears tears_of_pleasure tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2018 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers clothed clothing dated dominant dominant_male duo ectopenis fontcest from_front_position genitals glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster off_shoulder orange_blush orange_penis papyrus_(undertale) papysans penis realdemdemdmensfw sans_(undertale) sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male sweat top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2018 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers clothed clothing dated dominant dominant_male duo ectopenis fontcest from_front_position genitals glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster off_shoulder orange_blush orange_penis papyrus_(undertale) papysans penis realdemdemdmensfw sans_(undertale) sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male sweat top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
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2018 2boys 2d anal animated_skeleton artist_name ball_gag big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bondage bottom_sans bound brother/brother brother_penetrating_brother brothers clothed clothing dated dominant dominant_male duo ectopenis ectotongue fellatio fontcest from_front_position gagged gay_sex grey_background handjob humanoid humping incest intraspecies jacket kabedon larger_male larger_penetrating larger_penetrating_smaller legs_apart licking licking_penis male male/male male_only maledom malesub missionary_position monster mouth_gag multiple_views nude off_shoulder papyrus_(undertale) papysans penetration penetration_from_behind penis realdemdemdmensfw restrained restraints sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male thrusting thrusting_into_ass tongue tongue_out top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
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2023 2boys 2d all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing) boxers_around_one_leg brother/brother brother_penetrating_brother brothers clothed clothing dark_background digital_media duo fontcest from_behind_position hat headwear hooded_jacket hoodie humanoid implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi undead undertale undertale_(series) video_game_character video_games yaoi
2018 2boys 2d anal animated_skeleton apron ass big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_penis blush blush_lines bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers chinese_text clothed clothing digital_media duo ectopenis erection fontcest from_front_position humanoid incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy orange_background orange_blush orange_penis pants papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans_(undertale) sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble teeth text top_papyrus undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
2018 2boys 2d anal animated_skeleton apron ass big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_penis blush blush_lines bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers chinese_text clothed clothing digital_media duo ectopenis erection fontcest from_front_position humanoid incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy orange_background orange_blush orange_penis pants papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans_(undertale) sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble teeth text top_papyrus undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
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2018 2boys 2d alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers clothed clothing digital_media duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus_(undertale) papysans penetration penis sans_(undertale) sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus undead undertale undertale_(series) vest video_games white_background yaoi
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2018 2boys 2d anal anal_penetration anal_sex animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blush blush_lines bodily_fluids bodysuit bottom_sans bottomless bottomless_male bottomwear brother/brother brother_penetrating_brother brothers clothed clothing digital_media duo ectopenis ectoplasm fluids fontcest from_above humanoid incest intraspecies leg_grab lying male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125) monster monster_boy on_back orange_penis papyrus_(undertale) papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans_(undertale) sex sibling_incest siblings sitting skeleton solo_focus spread_legs teeth tissue tissue_paper top_papyrus topwear undead undertale undertale_(series) unseen_male_face used_tissue video_games visible_breath yaoi
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2018 2boys 2d ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers clothed clothing dark_background digital_media duo ectopenis ectoplasm ectopussy erection fontcest humanoid incest intraspecies kissing leg_grab leg_up male male/male male_focus male_only male_penetrating mianpigui_(wqw1201501125) monster monster_boy on_side papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans_(undertale) scarf sex shirt_up sibling_incest siblings simple_background skeleton sweat teeth top_papyrus undead undertale undertale_(series) video_games yaoi
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1:1 2023 2boys 2d anal animated_skeleton artist_name balls blush blush_lines bodily_fluids bottom_on_top bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothing completely_nude completely_nude_male couch couch_sex dominant dominant_male duo ectopenis empath__life fluids fontcest from_behind_position genitals incest leg_grab legs_apart making_out male male/male male_only maledom malesub monster monster_boy nude nude_male on_couch papyrus_(undertale) papysans penetration penis precum sans_(undertale) sex sibling_incest siblings simple_background sitting sitting_position skeleton submissive submissive_male tel_a_friend testicle top_papyrus traditional_media undead undertale undertale_(series) video_game_character video_games yaoi
1:1 2023 2boys 2d anal animated_skeleton artist_name balls blush blush_lines bodily_fluids bottom_on_top bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothing completely_nude completely_nude_male couch couch_sex dominant dominant_male duo ectopenis empath__life fluids fontcest from_behind_position genitals incest leg_grab legs_apart making_out male male/male male_only maledom malesub monster monster_boy nude nude_male on_couch papyrus_(undertale) papysans penetration penis precum sans_(undertale) sex sibling_incest siblings simple_background sitting sitting_position skeleton submissive submissive_male tel_a_friend testicle top_papyrus traditional_media undead undertale undertale_(series) video_game_character video_games yaoi
2022 2boys 2d anal animated_skeleton artist_name artist_watermark begging_for_more blue_blush blush blush_lines blushing_male bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background humanoid incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans_(undertale) sex sex_from_front sibling_incest siblings simple_background skeleton solid_color_background stand_and_carry_position standing submissive submissive_male suspended_congress swearing sweat tel_a_friend text top_papyrus undead undertale undertale_(series) video_game_character video_games watermark yaoi
2022 2boys 2d anal animated_skeleton artist_name artist_watermark begging_for_more blue_blush blush blush_lines blushing_male bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background humanoid incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans_(undertale) sex sex_from_front sibling_incest siblings simple_background skeleton solid_color_background stand_and_carry_position standing submissive submissive_male suspended_congress swearing sweat tel_a_friend text top_papyrus undead undertale undertale_(series) video_game_character video_games watermark yaoi
2015 2boys 2d anal animated_skeleton artist_request bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothing crying digital_media dominant dominant_male duo ectopenis fontcest from_behind_position fully_clothed fully_clothed_male gloves hooded_jacket hoodie incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans_(undertale) sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears teeth top_papyrus undead undertale undertale_(series) yaoi
2015 2boys 2d anal animated_skeleton artist_request bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothing crying digital_media dominant dominant_male duo ectopenis fontcest from_behind_position fully_clothed fully_clothed_male gloves hooded_jacket hoodie incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans_(undertale) sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears teeth top_papyrus undead undertale undertale_(series) yaoi
2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers bulge clothed clothing comic comic_page comic_panel crying crying_with_eyes_open dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia glowing_penis groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors intraspecies large_filesize laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) waking_up yaoi
2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers bulge clothed clothing comic comic_page comic_panel crying crying_with_eyes_open dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia glowing_penis groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors intraspecies large_filesize laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) waking_up yaoi
2010s 2017 2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers bulge clothed clothing comic comic_page comic_panel crying crying_with_eyes_open digital_media_(artwork) dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia glowing_penis groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors intraspecies large_filesize long_image looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy multiple_images on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tall_image tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) video_games waking_up yaoi
2010s 2017 2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers bulge clothed clothing comic comic_page comic_panel crying crying_with_eyes_open digital_media_(artwork) dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia glowing_penis groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors intraspecies large_filesize long_image looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy multiple_images on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tall_image tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) video_games waking_up yaoi