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2020s 2023 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie 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 papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans 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 twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie 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 papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans 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 twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) anger_vein animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers cape clothed clothing digital_media_(artwork) duo fontcest grabbing_hand hand_grab hooded_jacket hoodie imminent_sex inactive_account incest jacket kissing larger_male male male/male male_only monochrome monster monster_boy multiple_views pants_around_legs papyrus papyrus_(undertale) papysans pinned_down sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus toubigaizi twitter uke_sans undead undertale undertale_(series) valentine's_day video_game_character video_games white_background yaoi
2020s 2023 2boys 2d 2d_(artwork) anger_vein animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers cape clothed clothing digital_media_(artwork) duo fontcest grabbing_hand hand_grab hooded_jacket hoodie imminent_sex inactive_account incest jacket kissing larger_male male male/male male_only monochrome monster monster_boy multiple_views pants_around_legs papyrus papyrus_(undertale) papysans pinned_down sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus toubigaizi twitter uke_sans undead undertale undertale_(series) valentine's_day video_game_character video_games white_background yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton arms_around_another arms_around_another's_neck artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) drooling duo ectotongue empath__life fontcest grey_background hand_in_pants hand_under_clothes hands_on_another's_chest hands_on_chest incest kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing video_game_character video_games watermark yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton arms_around_another arms_around_another's_neck artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) drooling duo ectotongue empath__life fontcest grey_background hand_in_pants hand_under_clothes hands_on_another's_chest hands_on_chest incest kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing video_game_character video_games watermark yaoi
... 2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers cape clothed clothing dialog dialogue digital_media_(artwork) duo ectotongue empath__life english_text fontcest gloves grey_background hands_around_neck hands_on_another's_shoulders hands_on_shoulders hooded_jacket hoodie incest jacket kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) scarf seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend text tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games watermark yaoi
... 2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers cape clothed clothing dialog dialogue digital_media_(artwork) duo ectotongue empath__life english_text fontcest gloves grey_background hands_around_neck hands_on_another's_shoulders hands_on_shoulders hooded_jacket hoodie incest jacket kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) scarf seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend text tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games watermark yaoi
2010s 2018 2boys 2d 2d_(artwork) after_penetration after_sex anal animated_skeleton ass blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing completely_nude completely_nude_male cuddling cum cum_inside cum_leaking digital_media_(artwork) duo ectopenis ectoplasm erection fluids fontcest genital_fluids genitals hugging humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pillow pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) after_penetration after_sex anal animated_skeleton ass blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing completely_nude completely_nude_male cuddling cum cum_inside cum_leaking digital_media_(artwork) duo ectopenis ectoplasm erection fluids fontcest genital_fluids genitals hugging humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pillow pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers chinese_text clothed clothing 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 papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers chinese_text clothed clothing 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 papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing 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 papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing 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 papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm fluids fontcest humanoid incest intraspecies laying_on_back leg_grab legs_apart legs_spread lying_on_back male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125) monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting skeleton solo_focus tissue tissue_paper top_papyrus topwear uke_sans undead undertale undertale_(series) unseen_male_face used_tissue video_games visible_breath yaoi
2010s 2018 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm fluids fontcest humanoid incest intraspecies laying_on_back leg_grab legs_apart legs_spread lying_on_back male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125) monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting skeleton solo_focus tissue tissue_paper top_papyrus topwear uke_sans undead undertale undertale_(series) unseen_male_face used_tissue video_games visible_breath yaoi
2010s 2018 2boys 2d 2d_(artwork) ambiguous_fingering anal anal_fingering animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blue_penis blush bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo ectopenis ectoplasm ectopussy erection fingering fingering_another fingering_partner fontcest genitals gloves humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush papyrus papyrus_(undertale) papysans partially_clothed partially_colored penetration penis pussy sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings sitting skeleton top_papyrus topwear trembling uke_sans undead undertale undertale_(series) vaginal video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) ambiguous_fingering anal anal_fingering animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blue_penis blush bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo ectopenis ectoplasm ectopussy erection fingering fingering_another fingering_partner fontcest genitals gloves humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush papyrus papyrus_(undertale) papysans partially_clothed partially_colored penetration penis pussy sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings sitting skeleton top_papyrus topwear trembling uke_sans undead undertale undertale_(series) vaginal video_games yaoi
... 2010s 2018 2boys 2d 2d_(artwork) after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork) duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale) papysans penis pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
... 2010s 2018 2boys 2d 2d_(artwork) after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork) duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale) papysans penis pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background 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 papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans sans_(undertale) scarf seme_papyrus sex shirt_up sibling_incest siblings simple_background skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background 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 papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans sans_(undertale) scarf seme_papyrus sex shirt_up sibling_incest siblings simple_background skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) animated_skeleton ass bed bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing dark dark_room duo fontcest humanoid incest kneeling male male/male male_focus male_only mianpigui_(wqw1201501125) monochrome monster monster_boy on_bed pants_around_legs pants_down pants_pulled_down papyrus papyrus_(undertale) papysans power_bottom sans sans_(undertale) seme_papyrus skeleton top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) animated_skeleton ass bed bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing dark dark_room duo fontcest humanoid incest kneeling male male/male male_focus male_only mianpigui_(wqw1201501125) monochrome monster monster_boy on_bed pants_around_legs pants_down pants_pulled_down papyrus papyrus_(undertale) papysans power_bottom sans sans_(undertale) seme_papyrus skeleton top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
... 2020s 2023 2boys 2d 2d_(artwork) ? animated_skeleton ass black_pants blue_hoodie blue_jacket book bottom_sans brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) duo fontcest gloves holding_book holding_object hooded_jacket hoodie humanoid implied_incest jacket looking_at_crotch looking_down male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy pants papyrus papyrus_(undertale) papysans penis red_gloves sans sans_(undertale) seme_papyrus shirt_lift shirt_up skeleton spoken_ellipsis sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
... 2020s 2023 2boys 2d 2d_(artwork) ? animated_skeleton ass black_pants blue_hoodie blue_jacket book bottom_sans brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) duo fontcest gloves holding_book holding_object hooded_jacket hoodie humanoid implied_incest jacket looking_at_crotch looking_down male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy pants papyrus papyrus_(undertale) papysans penis red_gloves sans sans_(undertale) seme_papyrus shirt_lift shirt_up skeleton spoken_ellipsis sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1boy 1boy1girl 1girl 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous anonymous_female bigger_male blush blushing_male breasts cape carrying carrying_another carrying_partner closed_eyes clothed clothed/nude clothed_male clothed_male_nude_female clothing dinkynsfw duo ectopenis embarrassed embarrassed_male erection face_between_breasts face_in_breasts face_on_breast fellatio female frenulum frenum genitals gloves hetero hugging larger_male licking licking_penis looking_away male male/female monster nipples nude nude_female nude_female_clothed_male oral papyrus papyrus_(undertale) penile penis penis_grab penis_lick scarf seme_papyrus sex skeleton smaller_female straight sweat text top_papyrus traditional_art traditional_media traditional_media_(artwork) undead undertale undertale_(series) video_games
1boy 1boy1girl 1girl 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous anonymous_female bigger_male blush blushing_male breasts cape carrying carrying_another carrying_partner closed_eyes clothed clothed/nude clothed_male clothed_male_nude_female clothing dinkynsfw duo ectopenis embarrassed embarrassed_male erection face_between_breasts face_in_breasts face_on_breast fellatio female frenulum frenum genitals gloves hetero hugging larger_male licking licking_penis looking_away male male/female monster nipples nude nude_female nude_female_clothed_male oral papyrus papyrus_(undertale) penile penis penis_grab penis_lick scarf seme_papyrus sex skeleton smaller_female straight sweat text top_papyrus traditional_art traditional_media traditional_media_(artwork) undead undertale undertale_(series) video_games
1:1 1:1_aspect_ratio 2020s 2023 2boys animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo fontcest grabbing_leg incest intraspecies kissing kissing_crotch larger_male leg_grab male male/male male_only monochrome monster monster_boy naked nude papyrus papyrus_(undertale) papysans purplebluepen45 sans sans_(undertale) seme_papyrus sibling_incest siblings size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2020s 2023 2boys animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo fontcest grabbing_leg incest intraspecies kissing kissing_crotch larger_male leg_grab male male/male male_only monochrome monster monster_boy naked nude papyrus papyrus_(undertale) papysans purplebluepen45 sans sans_(undertale) seme_papyrus sibling_incest siblings size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2020s 2023 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton big_penis blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers deepthroat duo ectopenis fellatio fontcest huge_penis incest intraspecies long_penis male male/male male_only monster monster_boy monster_cock monster_penis oral orange_penis papyrus papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus top_papyrus traditional_media_(artwork) uke_sans uncensored undead undertale undertale_(series) unseen_male_face veiny_penis video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2020s 2023 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton big_penis blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers deepthroat duo ectopenis fellatio fontcest huge_penis incest intraspecies long_penis male male/male male_only monster monster_boy monster_cock monster_penis oral orange_penis papyrus papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus top_papyrus traditional_media_(artwork) uke_sans uncensored undead undertale undertale_(series) unseen_male_face veiny_penis video_games yaoi youfoundta
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton blindfold blindfolded blue_tongue bondage bottom_sans bound bound_arms bound_wrists brother brother/brother brother_and_brother brothers clothed clothed/nude clothing collar comic comic_panel digital_media_(artwork) dominant dominant_male domination duo ectopenis ectotongue english_text fontcest imminent_fellatio imminent_oral incest lowest-of-dirt lowest_of_dirt male male/male male_only maledom monster naked nude orange_penis papyrus papyrus_(undertale) papysans partially_colored penis sans sans_(undertale) seme_papyrus silhouette skeleton submissive text tied_arms tied_up tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unzipping_pants video_game_character video_games white_background yandere yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton blindfold blindfolded blue_tongue bondage bottom_sans bound bound_arms bound_wrists brother brother/brother brother_and_brother brothers clothed clothed/nude clothing collar comic comic_panel digital_media_(artwork) dominant dominant_male domination duo ectopenis ectotongue english_text fontcest imminent_fellatio imminent_oral incest lowest-of-dirt lowest_of_dirt male male/male male_only maledom monster naked nude orange_penis papyrus papyrus_(undertale) papysans partially_colored penis sans sans_(undertale) seme_papyrus silhouette skeleton submissive text tied_arms tied_up tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) unzipping_pants video_game_character video_games white_background yandere yaoi
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2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton bed blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing db-bird digital_media_(artwork) duo ectopenis ectoplasm english_text fontcest from_behind_position humanoid incest intraspecies male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nude nude_male on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penetration_from_behind penis sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton text top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1:1 1:1_aspect_ratio 1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton artist_name artist_watermark black_legwear blue_pussy bottom_sans brother brother/brother brother_and_brother brothers cuntboy digital_media_(artwork) duo ectopussy empath__life fingering fingering_another fingering_pussy fontcest gif grey_background hand_on_another's_face hand_on_face incest intraspecies legs_apart legwear male male/male monochrome monster monster_boy nude one_eye_closed papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background sitting skeleton tel_a_friend top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games watermark yaoi
1:1 1:1_aspect_ratio 1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton artist_name artist_watermark black_legwear blue_pussy bottom_sans brother brother/brother brother_and_brother brothers cuntboy digital_media_(artwork) duo ectopussy empath__life fingering fingering_another fingering_pussy fontcest gif grey_background hand_on_another's_face hand_on_face incest intraspecies legs_apart legwear male male/male monochrome monster monster_boy nude one_eye_closed papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background sitting skeleton tel_a_friend top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games watermark yaoi
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2010s 2017 2d 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans bukkake clothed clothing cum cum_in_mouth cum_on_tongue digital_media ectotongue fangs finger_in_mouth fontcest gangbang grillby grillsans hand implied_incest lowest-of-dirt male male/male male_focus male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus_(undertale) papysans penis red_background sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus sex skeleton solo_focus tongue top_gaster top_grillby top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_game_character video_games w.d._gaster yaoi
1:1 1:1_aspect_ratio 2020s 2023 2boys 2d 2d_(artwork) anal animated_skeleton artist_name balls blush blush_lines bodily_fluids bottom_on_top bottom_sans brother brother/brother brother_and_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 papyrus papyrus_(undertale) papysans penetration penis precum sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting sitting_on_couch sitting_on_sofa sitting_position skeleton sofa submissive submissive_male tel_a_friend testicle top_papyrus traditional_art traditional_media_(artwork) twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2020s 2023 2boys 2d 2d_(artwork) anal animated_skeleton artist_name balls blush blush_lines bodily_fluids bottom_on_top bottom_sans brother brother/brother brother_and_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 papyrus papyrus_(undertale) papysans penetration penis precum sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting sitting_on_couch sitting_on_sofa sitting_position skeleton sofa submissive submissive_male tel_a_friend testicle top_papyrus traditional_art traditional_media_(artwork) twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media_(artwork) dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans sans_(undertale) seme_papyrus 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 twitter uke_sans undead undertale undertale_(series) video_game_character video_games watermark yaoi
2020s 2022 2boys 2d 2d_(artwork) 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 brother_and_brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media_(artwork) dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans sans_(undertale) seme_papyrus 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 twitter uke_sans undead undertale undertale_(series) video_game_character video_games watermark yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name beetleevil blue_blush blue_hoodie blue_jacket blush blushing_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothing covering_mouth covering_own_mouth crying digital_media_(artwork) drooling duo ectopenis english_text evilbeetle eye_fucking eye_penetration fellatio fontcest genitals gloves heart-shaped_pupils heart_eyes holding_hands hooded_jacket hoodie incest intraspecies jacket male male/male male_only monster monster_boy multiple_views oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_in_eye penis_in_mouth penis_through_clothing red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton skull_fucking soul soul_sex sucking_penis tears text top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name beetleevil blue_blush blue_hoodie blue_jacket blush blushing_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothing covering_mouth covering_own_mouth crying digital_media_(artwork) drooling duo ectopenis english_text evilbeetle eye_fucking eye_penetration fellatio fontcest genitals gloves heart-shaped_pupils heart_eyes holding_hands hooded_jacket hoodie incest intraspecies jacket male male/male male_only monster monster_boy multiple_views oral orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_in_eye penis_in_mouth penis_through_clothing red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton skull_fucking soul soul_sex sucking_penis tears text top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2015 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing crying 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 papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears top_papyrus uke_sans undead undertale undertale_(series) unknown_artist yaoi
2010s 2015 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing crying 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 papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears top_papyrus uke_sans undead undertale undertale_(series) unknown_artist yaoi
2020s 2021 2boys 2d 2d_(artwork) absurd_res animated_skeleton artist_name black_bottomwear black_clothing black_pants blue_blush blue_clothing blue_eye blue_hoodie blue_jacket blue_penis blue_topwear blush blush_lines blushing_male bodily_fluids bone boots bottom_sans bottomwear brother brother/brother brother_and_brother brothers candy candy_cane christmas christmas_clothing christmas_headwear christmas_sweater christmas_topwear clothed clothing covering_mouth covering_own_mouth dessert digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue english_text fluids fontcest food food_fetish food_insertion food_play footwear ganzooky genital_fluids genitals gloves glowing glowing_eye green_background greeting_card hand_on_mouth hat headgear headwear hi_res holidays hooded_jacket hoodie improvised_sex_toy incest intraspecies jacket legs_apart male male/male male_only maledom malesub merry_christmas monster monster_boy nsfwsinningsans object_insertion orange_blush orange_tongue pants papyrus papyrus_(undertale) papysans pattern_bottomwear pattern_clothing pattern_pants penis pink_footwear pink_slippers precum red_boots red_clothing red_footwear red_gloves red_ribbon ribbon ribbon_on_penis sans sans_(undertale) santa_hat seme_papyrus sibling_incest siblings sitting skeleton slippers snow socks sounding spread_legs striped_bottomwear striped_clothing striped_pants stripes submissive submissive_male sweater text tongue tongue_out top_papyrus topwear translucent_penis two-tone_background uke_sans undead undertale undertale_(series) urethral urethral_insertion video_games white_border yaoi
2020s 2021 2boys 2d 2d_(artwork) absurd_res animated_skeleton artist_name black_bottomwear black_clothing black_pants blue_blush blue_clothing blue_eye blue_hoodie blue_jacket blue_penis blue_topwear blush blush_lines blushing_male bodily_fluids bone boots bottom_sans bottomwear brother brother/brother brother_and_brother brothers candy candy_cane christmas christmas_clothing christmas_headwear christmas_sweater christmas_topwear clothed clothing covering_mouth covering_own_mouth dessert digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue english_text fluids fontcest food food_fetish food_insertion food_play footwear ganzooky genital_fluids genitals gloves glowing glowing_eye green_background greeting_card hand_on_mouth hat headgear headwear hi_res holidays hooded_jacket hoodie improvised_sex_toy incest intraspecies jacket legs_apart male male/male male_only maledom malesub merry_christmas monster monster_boy nsfwsinningsans object_insertion orange_blush orange_tongue pants papyrus papyrus_(undertale) papysans pattern_bottomwear pattern_clothing pattern_pants penis pink_footwear pink_slippers precum red_boots red_clothing red_footwear red_gloves red_ribbon ribbon ribbon_on_penis sans sans_(undertale) santa_hat seme_papyrus sibling_incest siblings sitting skeleton slippers snow socks sounding spread_legs striped_bottomwear striped_clothing striped_pants stripes submissive submissive_male sweater text tongue tongue_out top_papyrus topwear translucent_penis two-tone_background uke_sans undead undertale undertale_(series) urethral urethral_insertion video_games white_border 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
2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open duo ectobody ectopenis fontcest glowing glowing_eye incest indoors intraspecies laying_on_bed 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 sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton supermuuh tears testicles top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open duo ectobody ectopenis fontcest glowing glowing_eye incest indoors intraspecies laying_on_bed 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 sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton supermuuh tears testicles top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open duo fontcest glowing glowing_eye incest indoors laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only monochrome on_bed orange_blush papyrus papyrus_(undertale) papysans partially_colored profanity sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears text top_papyrus uke_sans undead undertale undertale_(series) waking_up yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying crying_with_eyes_open duo fontcest glowing glowing_eye incest indoors laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only monochrome on_bed orange_blush papyrus papyrus_(undertale) papysans partially_colored profanity sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears text top_papyrus uke_sans undead undertale undertale_(series) waking_up yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia groping groping_from_behind hand_in_pants hand_under_clothes incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh surprised surprised_expression tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia groping groping_from_behind hand_in_pants hand_under_clothes incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh surprised surprised_expression tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom biting_pillow blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel crying duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh tears top_papyrus uke_sans undead under_blanket undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket bottom_sans brother brother/brother brother_and_brother brothers bulge clothed clothing comic comic_page comic_panel dry_humping duo erection erection_under_clothes fontcest glowing glowing_genitalia humping incest indoors intraspecies laying_on_bed lying_on_bed male male/male male_only monochrome monster monster_boy on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket bottom_sans brother brother/brother brother_and_brother brothers bulge clothed clothing comic comic_page comic_panel dry_humping duo erection erection_under_clothes fontcest glowing glowing_genitalia humping incest indoors intraspecies laying_on_bed lying_on_bed male male/male male_only monochrome monster monster_boy on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel duo fontcest incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel duo fontcest incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi
2010s 2017 2boys animated_skeleton bed bedroom blanket bottom_sans brother brother/brother brother_and_brother brothers clothed clothing comic comic_page comic_panel duo fontcest glowing glowing_genitalia incest indoors laying_on_bed lying_on_bed male male/male male_only monochrome on_bed papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential skeleton supermuuh top_papyrus uke_sans undead under_blanket undertale undertale_(series) unseen_male_face yaoi