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2d animated_skeleton blue_blush blue_jacket blush bottom_sans breasts brother/brother brother_penetrating_brother brothers clothed clothing digital_media duo ectobreasts ectopenis ectoplasm fontcest genitals hooded_jacket hoodie incest jacket male male_pov medium_breasts misake-san moaning monster open_jacket orange_penis papyrus_(undertale) papysans penetrating_pov penetration penetrator_pov penis sans_(undertale) sex sibling_incest siblings skeleton solo_focus speech_bubble top_papyrus topwear undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games
2d animated_skeleton blue_blush blue_jacket blush bottom_sans breasts brother/brother brother_penetrating_brother brothers clothed clothing digital_media duo ectobreasts ectopenis ectoplasm fontcest genitals hooded_jacket hoodie incest jacket male male_pov medium_breasts misake-san moaning monster open_jacket orange_penis papyrus_(undertale) papysans penetrating_pov penetration penetrator_pov penis sans_(undertale) sex sibling_incest siblings skeleton solo_focus speech_bubble top_papyrus topwear undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games
1:1 2boys 2d animated_skeleton big_penis blue_blush blue_hoodie blue_jacket blue_penis blush bodily_fluids bottomless bottomless_male brother/brother brothers cock_hungry cum cumshot digital_media drooling duo ectopenis ectoplasm english_text fantasizing fontcest genitals glowing glowing_genitalia glowing_penis hands_on_cheeks hands_on_own_cheeks heart-shaped_pupils heart_eyes hooded_jacket hoodie hoodie_only incest jacket looking_at_genitalia looking_at_penis looking_down male male/male male_only measurements monster multiple_views nude orange_cum orange_penis otterrpopp papyrus_(undertale) penis penis_measurement penis_measuring precum sans_(undertale) siblings skeleton small_penis smooth_penis solo_focus talking talking_to_self text thinking third-party_source topwear undead undertale undertale_(series) unseen_character unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
1:1 2boys 2d animated_skeleton big_penis blue_blush blue_hoodie blue_jacket blue_penis blush bodily_fluids bottomless bottomless_male brother/brother brothers cock_hungry cum cumshot digital_media drooling duo ectopenis ectoplasm english_text fantasizing fontcest genitals glowing glowing_genitalia glowing_penis hands_on_cheeks hands_on_own_cheeks heart-shaped_pupils heart_eyes hooded_jacket hoodie hoodie_only incest jacket looking_at_genitalia looking_at_penis looking_down male male/male male_only measurements monster multiple_views nude orange_cum orange_penis otterrpopp papyrus_(undertale) penis penis_measurement penis_measuring precum sans_(undertale) siblings skeleton small_penis smooth_penis solo_focus talking talking_to_self text thinking third-party_source topwear undead undertale undertale_(series) unseen_character unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
1girl 2020s 2023 2d 2d_(artwork) animated_skeleton artist_name artist_watermark ass black_legwear black_stockings black_thighhighs blue_body blue_breasts blue_nipples blue_penis bottom_sans bottomless breasts chubby clothed clothing digital_media_(artwork) ech7474 ectopenis ectopussy ectotongue female_sans free_use genderswap genderswap_(mtf) genitals gloves hooded_jacket hoodie jacket kabeshiri legwear male male/female milking milking_breasts milking_machine monster multiple_views nipples orange_background penetration penis pussy rule_63 sans sans_(undertale) sex sex_from_behind simple_background skeleton solid_color_background solo_focus stockings stuck stuck_in_wall submissive sweater tears thighhighs thrusting tongue tongue_out twitching twitter uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure) watermark white_gloves
1girl 2020s 2023 2d 2d_(artwork) animated_skeleton artist_name artist_watermark ass black_legwear black_stockings black_thighhighs blue_body blue_breasts blue_nipples blue_penis bottom_sans bottomless breasts chubby clothed clothing digital_media_(artwork) ech7474 ectopenis ectopussy ectotongue female_sans free_use genderswap genderswap_(mtf) genitals gloves hooded_jacket hoodie jacket kabeshiri legwear male male/female milking milking_breasts milking_machine monster multiple_views nipples orange_background penetration penis pussy rule_63 sans sans_(undertale) sex sex_from_behind simple_background skeleton solid_color_background solo_focus stockings stuck stuck_in_wall submissive sweater tears thighhighs thrusting tongue tongue_out twitching twitter uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure) watermark white_gloves
1boy 1girl 2020s 2023 2d animated_skeleton artist_name artist_watermark blue_breasts blue_nipples blue_tongue bottom_sans breasts clothed clothed_male clothing cum cum_on_face digital_media duo ech7474 ectopenis female_sans genderswap genderswap_(mtf) genitals gloves hooded_jacket hoodie jacket licking licking_face licking_penis male male/female monster multiple_views nipples nude off_shoulder orange_penis paizuri penis purple_background sans_(undertale) sanster seme_gaster sex simple_background skeleton solid_color_background sweater tears top_gaster uke_sans undead undertale undertale_(series) video_game_character video_games w.d._gaster watermark white_gloves
1boy 1girl 2020s 2023 2d animated_skeleton artist_name artist_watermark blue_breasts blue_nipples blue_tongue bottom_sans breasts clothed clothed_male clothing cum cum_on_face digital_media duo ech7474 ectopenis female_sans genderswap genderswap_(mtf) genitals gloves hooded_jacket hoodie jacket licking licking_face licking_penis male male/female monster multiple_views nipples nude off_shoulder orange_penis paizuri penis purple_background sans_(undertale) sanster seme_gaster sex simple_background skeleton solid_color_background sweater tears top_gaster uke_sans undead undertale undertale_(series) video_game_character video_games w.d._gaster watermark white_gloves
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous arm_support artist_name ass bittersweetdeath black_tank_top blue_blush blue_penis blush bodily_fluids bottomless bottomless_male cum cum_stain digital_media duo ectopenis english_text fluids hand heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket looking_pleasured male male_focus micro micro_male microphilia miniboy monster monster_boy penis red_hoodie red_jacket sans_(undertale) semen simple_background size_difference skeleton smaller_male smooth_penis solo_focus submissive submissive_male sweat talking talking_to_viewer tank_top teeth text undead undertale undertale_(series) video_game_character video_games wariza
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous arm_support artist_name ass bittersweetdeath black_tank_top blue_blush blue_penis blush bodily_fluids bottomless bottomless_male cum cum_stain digital_media duo ectopenis english_text fluids hand heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket looking_pleasured male male_focus micro micro_male microphilia miniboy monster monster_boy penis red_hoodie red_jacket sans_(undertale) semen simple_background size_difference skeleton smaller_male smooth_penis solo_focus submissive submissive_male sweat talking talking_to_viewer tank_top teeth text undead undertale undertale_(series) video_game_character video_games wariza
1boy 2d animated_skeleton ass blue_blush blue_penis blush bodily_fluids clothing couch digital_media ectopenis erection fluids genitals glowing glowing_genitalia glowing_penis hood hooded_jacket jacket male male_masturbation male_moaning male_only masturbation moaning monster on_couch penile penile_masturbation penis precum sans_(undertale) sitting skeleton sofa solo_male text touching_penis undead undertale undertale_(series) unknown_artist video_games
1boy 2d animated_skeleton ass blue_blush blue_penis blush bodily_fluids clothing couch digital_media ectopenis erection fluids genitals glowing glowing_genitalia glowing_penis hood hooded_jacket jacket male male_masturbation male_moaning male_only masturbation moaning monster on_couch penile penile_masturbation penis precum sans_(undertale) sitting skeleton sofa solo_male text touching_penis undead undertale undertale_(series) unknown_artist video_games
2015 2boys 2d animated_skeleton arm_support bad_id bad_tumblr_id big_penis bigger_male blue_background bodily_fluids bottom_sans brother/brother brothers closed_eyes clothed clothed_male clothing digital_media duo ectopenis ectotongue erection fellatio fluids fontcest genitals gloves hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male male male/male male_only monster monster_boy noxiousaberration open_mouth oral orange_penis orange_tongue papyrus_(undertale) papysans partially_colored penis penis_grab penis_through_clothing sans_(undertale) scarf sex sibling_incest siblings skeleton smaller_male solo_focus sweat teeth testicles third-party_source tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2015 2boys 2d animated_skeleton arm_support bad_id bad_tumblr_id big_penis bigger_male blue_background bodily_fluids bottom_sans brother/brother brothers closed_eyes clothed clothed_male clothing digital_media duo ectopenis ectotongue erection fellatio fluids fontcest genitals gloves hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male male male/male male_only monster monster_boy noxiousaberration open_mouth oral orange_penis orange_tongue papyrus_(undertale) papysans partially_colored penis penis_grab penis_through_clothing sans_(undertale) scarf sex sibling_incest siblings skeleton smaller_male solo_focus sweat teeth testicles third-party_source tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1boy 1cuntboy 2015 2d animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_jacket blue_pussy blush bottom_on_top bottom_sans bottomwear brother/brother brother_penetrating_brother brothers brown_background clitoris clothed clothing cuntboy cuntboy_penetrated digital_media digital_media_(artwork) drooling duo ectopenis ectopussy fontcest genitals gloves glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy male_only male_penetrating male_penetrating_cuntboy monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing pussy pussy_through_clothing red_gloves royalstash sans_(undertale) sex sex_through_clothes sibling_incest siblings simple_background sitting skeleton smaller_cuntboy smaller_penetrated solid_color_background teeth text top_papyrus topwear undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
1boy 1cuntboy 2015 2d animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_jacket blue_pussy blush bottom_on_top bottom_sans bottomwear brother/brother brother_penetrating_brother brothers brown_background clitoris clothed clothing cuntboy cuntboy_penetrated digital_media digital_media_(artwork) drooling duo ectopenis ectopussy fontcest genitals gloves glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy male_only male_penetrating male_penetrating_cuntboy monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing pussy pussy_through_clothing red_gloves royalstash sans_(undertale) sex sex_through_clothes sibling_incest siblings simple_background sitting skeleton smaller_cuntboy smaller_penetrated solid_color_background teeth text top_papyrus topwear undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
2boys 2d after_penetration after_sex ahegao anal animated_skeleton arm_support ass ass_grab bad_id bad_tumblr_id bigger_penetrating blue_blush blue_hoodie blue_jacket blue_tongue blush bone bottom_on_top bottom_sans bottomless brother/brother brothers clothed clothed_male clothed_sex clothing cum cum_leaking cum_trail digital_media drooling duo ectopenis ectoplasm ectotongue erection facing_another fontcest fully_clothed fully_clothed_male genital_fluids genitals gloves heart heart-shaped_pupils heart_eyes hooded_jacket hoodie humanoid humanoid_penis incest intraspecies jacket kneel kneeling larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_ahegao male_only male_penetrating mastery_position monster monster_boy open_mouth orange_blush orange_penis panting papyrus_(undertale) papysans partially_clothed penis penis_through_clothing power_bottom red_gloves sans_(undertale) sex sibling_incest siblings sitting skeleton smaller_penetrated spoopy-gaster straddling submissive_top sweat third-party_source tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath white_background yaoi
2boys 2d after_penetration after_sex ahegao anal animated_skeleton arm_support ass ass_grab bad_id bad_tumblr_id bigger_penetrating blue_blush blue_hoodie blue_jacket blue_tongue blush bone bottom_on_top bottom_sans bottomless brother/brother brothers clothed clothed_male clothed_sex clothing cum cum_leaking cum_trail digital_media drooling duo ectopenis ectoplasm ectotongue erection facing_another fontcest fully_clothed fully_clothed_male genital_fluids genitals gloves heart heart-shaped_pupils heart_eyes hooded_jacket hoodie humanoid humanoid_penis incest intraspecies jacket kneel kneeling larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_ahegao male_only male_penetrating mastery_position monster monster_boy open_mouth orange_blush orange_penis panting papyrus_(undertale) papysans partially_clothed penis penis_through_clothing power_bottom red_gloves sans_(undertale) sex sibling_incest siblings sitting skeleton smaller_penetrated spoopy-gaster straddling submissive_top sweat third-party_source tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath white_background yaoi
1:1 1boy 1cuntboy 2017 2d ahegao animated_skeleton anonymous blue_blush blue_clitoris blue_penis blue_pussy blue_tongue blush bottom_sans bottomless bottomless_male candle clitoris closed_eyes clothed clothed_male clothing cum cumshot cuntboy cuntboysub digital_media disembodied_hand drooling ectopenis ectoplasm ectopussy ectotongue ejaculation english_text erection genitals hand hoodie jacket kneel looking_pleasured male male_ahegao male_focus male_moaning malesub masturbation micro micro_male microphilia miniboy moaning monochrome monster multiple_views nude nude_male orgasm partially_clothed partially_clothed_male partially_colored penetration penis phone pleasure_face plushie pussy sans_(undertale) sex simple_background size_difference skeleton slippers small_penis smaller_male smartphone smooth_penis socks solo_focus solo_male speech_bubble submissive submissive_cuntboy submissive_male tears text the-shewolf-den tongue tongue_out topwear uke_sans undead undertale undertale_(series) vibrating video_game_character video_games
1:1 1boy 1cuntboy 2017 2d ahegao animated_skeleton anonymous blue_blush blue_clitoris blue_penis blue_pussy blue_tongue blush bottom_sans bottomless bottomless_male candle clitoris closed_eyes clothed clothed_male clothing cum cumshot cuntboy cuntboysub digital_media disembodied_hand drooling ectopenis ectoplasm ectopussy ectotongue ejaculation english_text erection genitals hand hoodie jacket kneel looking_pleasured male male_ahegao male_focus male_moaning malesub masturbation micro micro_male microphilia miniboy moaning monochrome monster multiple_views nude nude_male orgasm partially_clothed partially_clothed_male partially_colored penetration penis phone pleasure_face plushie pussy sans_(undertale) sex simple_background size_difference skeleton slippers small_penis smaller_male smartphone smooth_penis socks solo_focus solo_male speech_bubble submissive submissive_cuntboy submissive_male tears text the-shewolf-den tongue tongue_out topwear uke_sans undead undertale undertale_(series) vibrating video_game_character video_games
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous arm_support ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media disembodied_hand drooling duo ectopenis erection genitals green_background hand heart-shaped_pupils heart_eyes licking licking_penis macrophilia male male_focus male_moaning malesub micro micro_male microphilia miniboy moaning monster nose_piercing nude nude_male oral penis penis_on_tongue piercing precum saliva sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus spoken_heart standing sweat teeth text tongue undead undertale undertale_(series) video_game_character video_games
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous arm_support ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media disembodied_hand drooling duo ectopenis erection genitals green_background hand heart-shaped_pupils heart_eyes licking licking_penis macrophilia male male_focus male_moaning malesub micro micro_male microphilia miniboy moaning monster nose_piercing nude nude_male oral penis penis_on_tongue piercing precum saliva sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus spoken_heart standing sweat teeth text tongue undead undertale undertale_(series) video_game_character video_games
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous artist_name ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media disembodied_hand drooling duo ectopenis ectoplasm erection genitals green_background hand heart-shaped_pupils heart_eyes macrophilia male male_focus malesub micro micro_male microphilia miniboy monster monster_boy nude nude_male penis sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus solo_male standing submissive submissive_male teeth undead undertale undertale_(series) video_games
1boy 1other 2016 2d ambiguous_gender animated_skeleton anonymous artist_name ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media disembodied_hand drooling duo ectopenis ectoplasm erection genitals green_background hand heart-shaped_pupils heart_eyes macrophilia male male_focus malesub micro micro_male microphilia miniboy monster monster_boy nude nude_male penis sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus solo_male standing submissive submissive_male teeth undead undertale undertale_(series) video_games
2017 2boys 2d 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 brothers christmas clothed clothing digital_media dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year humanoid 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_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
2017 2boys 2d 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 brothers christmas clothed clothing digital_media dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year humanoid 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_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
1boy 1cuntboy 2016 2d ahegao animated_skeleton artist_name blue_blush blue_body blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_cuntboy brother/brother brother_penetrating_brother brothers brown_background carrying carrying_partner carrying_position clothed clothing cuntboy cuntboy_penetrated digital_media 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_(undertale) papysans penetration penis pleasure_face profanity pussy sans_(undertale) sex sibling_incest siblings simple_background sitting skeleton solid_color_background speech_bubble stockings talking talking_to_another talking_to_partner teeth text thighhighs tongue tongue_out top_papyrus topwear two-tone_legwear two_tone_legwear undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
1boy 1cuntboy 2016 2d ahegao animated_skeleton artist_name blue_blush blue_body blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_cuntboy brother/brother brother_penetrating_brother brothers brown_background carrying carrying_partner carrying_position clothed clothing cuntboy cuntboy_penetrated digital_media 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_(undertale) papysans penetration penis pleasure_face profanity pussy sans_(undertale) sex sibling_incest siblings simple_background sitting skeleton solid_color_background speech_bubble stockings talking talking_to_another talking_to_partner teeth text thighhighs tongue tongue_out top_papyrus topwear two-tone_legwear two_tone_legwear undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
2010s 2boys 2d anal anal_penetration anal_sex animated_skeleton armwear artist_name ass ass_grab backsack bell_choker bell_collar bent_over blush bottom_sans box breasts brother/brother brother_penetrating_brother brothers bulging_eyes christmas christmas_hat christmas_outfit christmas_tree cleavage clothed clothing comic comic_panel counter crossdressing digital_media dress dress_lift duo ectobody ectobreasts ectobutt ectopenis ectoplasm edit edited eli-sin-g english_text fontcest from_behind_position gift gift_box gloves grabbing_own_penis hat holding holding_box holidays incest intraspecies kitchen kitchen_counter kolesjoie male male/male male_only male_penetrated male_penetrating male_penetrating_male male_with_breasts merry_christmas monochrome monster monster_boy moobs panties papyrus_(undertale) papysans penetration penetration_from_behind penis penis_grab profanity ribbon_choker ribbon_collar sans_(undertale) santa_costume santa_dress santa_hat scarf seducing seductive sex sex_from_behind sibling_incest siblings skeleton striptease talking testicle text thighs third-party_edit top_papyrus topwear undead undertale undertale_(series) veiny_penis video_game_character video_games wink yaoi
2010s 2boys 2d anal anal_penetration anal_sex animated_skeleton armwear artist_name ass ass_grab backsack bell_choker bell_collar bent_over blush bottom_sans box breasts brother/brother brother_penetrating_brother brothers bulging_eyes christmas christmas_hat christmas_outfit christmas_tree cleavage clothed clothing comic comic_panel counter crossdressing digital_media dress dress_lift duo ectobody ectobreasts ectobutt ectopenis ectoplasm edit edited eli-sin-g english_text fontcest from_behind_position gift gift_box gloves grabbing_own_penis hat holding holding_box holidays incest intraspecies kitchen kitchen_counter kolesjoie male male/male male_only male_penetrated male_penetrating male_penetrating_male male_with_breasts merry_christmas monochrome monster monster_boy moobs panties papyrus_(undertale) papysans penetration penetration_from_behind penis penis_grab profanity ribbon_choker ribbon_collar sans_(undertale) santa_costume santa_dress santa_hat scarf seducing seductive sex sex_from_behind sibling_incest siblings skeleton striptease talking testicle text thighs third-party_edit top_papyrus topwear undead undertale undertale_(series) veiny_penis video_game_character video_games wink yaoi
2010s 2boys 2d anal anal_penetration anal_sex animated_skeleton armwear artist_name ass ass_grab backsack bell_choker bell_collar bent_over blush bottom_sans box breasts brother/brother brother_penetrating_brother brothers bulging_eyes christmas christmas_hat christmas_outfit christmas_tree cleavage clothed clothing comic comic_panel counter crossdressing digital_media dress dress_lift duo ectobody ectobreasts ectobutt ectopenis ectoplasm eli-sin-g english_text fontcest from_behind_position gift gift_box gloves grabbing_own_penis hat holding holding_box holidays incest intraspecies kitchen kitchen_counter kolesjoie male male/male male_only male_penetrated male_penetrating male_penetrating_male male_with_breasts merry_christmas monochrome monster monster_boy moobs panties papyrus_(undertale) papysans penetration penetration_from_behind penis penis_grab profanity ribbon_choker ribbon_collar sans_(undertale) santa_costume santa_dress santa_hat scarf seducing seductive sex sex_from_behind sibling_incest siblings skeleton striptease talking testicle text thighs top_papyrus topwear undead undertale undertale_(series) veiny_penis video_game_character video_games wink yaoi
2010s 2boys 2d anal anal_penetration anal_sex animated_skeleton armwear artist_name ass ass_grab backsack bell_choker bell_collar bent_over blush bottom_sans box breasts brother/brother brother_penetrating_brother brothers bulging_eyes christmas christmas_hat christmas_outfit christmas_tree cleavage clothed clothing comic comic_panel counter crossdressing digital_media dress dress_lift duo ectobody ectobreasts ectobutt ectopenis ectoplasm eli-sin-g english_text fontcest from_behind_position gift gift_box gloves grabbing_own_penis hat holding holding_box holidays incest intraspecies kitchen kitchen_counter kolesjoie male male/male male_only male_penetrated male_penetrating male_penetrating_male male_with_breasts merry_christmas monochrome monster monster_boy moobs panties papyrus_(undertale) papysans penetration penetration_from_behind penis penis_grab profanity ribbon_choker ribbon_collar sans_(undertale) santa_costume santa_dress santa_hat scarf seducing seductive sex sex_from_behind sibling_incest siblings skeleton striptease talking testicle text thighs top_papyrus topwear undead undertale undertale_(series) veiny_penis video_game_character video_games wink yaoi
2017 2boys 2d ahegao anal animated_skeleton announcing_orgasm artist_name blue_blush blue_tongue blush boots bottom_sans bottomless_skirt brother/brother brother_penetrating_brother brothers christmas christmas_hat christmas_outfit clothed clothing comic comic_page comic_panel couch couch_sex crossdressing cum digital_media drooling duo ectopenis ectoplasm ectotongue edit edited ejaculation english_text fontcest from_front_position gloves hat holidays incest interlocked_fingers intertwined_fingers intraspecies large_filesize legwear long_image making_out male male/male male_only male_penetrated male_penetrating male_penetrating_male merry_christmas midriff missionary_position monochrome monster monster_boy multiple_images orgasm papyrus_(undertale) papysans partially_colored penetration red_blush red_penis red_tongue removing_glove saliva saliva_trail sans_(undertale) santa_costume santa_hat scarf sequential sex short_skirt sibling_incest siblings skeleton skirt sofa stockings talking tall_image tears teeth text third-party_edit thornisicezins thrusting tongue top_papyrus topwear touching_crotch tumblr_username typo undead undertale undertale_(series) video_games wink yaoi
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