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! !? ... 13thcatofthegate 2010s 2018 2boys 2d 2d_(artwork) 2males after_sex all_fours anal animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck bedroom bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_cum blue_eye blue_penis blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male comic comic_page comic_panel comic_sans completely_nude completely_nude_male crying cum cum_on_sheets digital_media_(artwork) doggy_position drooling duo ectopenis ectotongue edit edited ejaculation english_text extremely_large_filesize fontcest from_behind_position genitals glowing_eye hand_on_another's_chest hand_on_chest handjob handjob_while_penetrating hands_around_neck hugged_from_behind hugging incest indoors kissing kissing_cheek large_filesize larger_male larger_penetrating larger_penetrating_smaller laying_down licking_neck licking_tongue long_image looking_at_another looking_at_partner lying_down making_out male male/male male_only male_penetrated male_penetrating male_penetrating_male monster multiple_images nude nude_male orange_blush orange_eye orange_penis orange_tongue orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_colored penetration penetration_from_behind penis saliva_string saliva_trail sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind shirt_removed shorter_male skeleton sleeping sleeping_nude sleeping_together smaller_male smaller_penetrated soul soul_sex speech_bubble spoken_ellipsis spoken_exclamation_mark spoken_exclamation_point taking_off_clothes talking talking_to_another tall_image taller_male tears text text_bubble third-party_edit tongue tongue_out top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressed undressing undressing_another undressing_partner video_game_character video_games wake_up yaoi zzz
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1:1 1:1_aspect_ratio 1boy 2020s 2023 2d 2d_(artwork) animated_skeleton artist_name bathing bathroom bathtub blue_blush blue_cum blue_penis blush bubble_bath comic_sans covering_mouth covering_own_mouth cum cumshot digital_media_(artwork) door ectopenis ejaculation english_text fallen_ghost_angel_(artist) genitals male male_masturbation male_only masturbation monster monster_boy papyrus papyrus_(font) papyrus_(undertale) penile penile_masturbation penis profanity sans sans_(undertale) sequence sequential skeleton solo_focus solo_male speech_bubble surprised text twitter undead undertale undertale_(series) unseen_character video_game_character video_games
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2010s 2017 2boys anal animated_skeleton bed_sheet bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_cum blue_hoodie blue_jacket blue_penis blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed cum cum_on_face cum_on_self cum_while_penetrated cumshot duo ectopenis fingers_interlocked fontcest from_front_position gay gay_sex gloves grabbing_sheets gripping_sheets hooded_jacket hoodie incest indoors interlocked_fingers intertwined_fingers intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male missionary_position mmmemmo monster monster_boy orange_blush papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sequence sequential sequential_art sequential_set sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears top_papyrus uke_sans undead undertale undertale_(series) visible_breath yaoi
2010s 2017 2boys anal animated_skeleton bed_sheet bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_cum blue_hoodie blue_jacket blue_penis blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed cum cum_on_face cum_on_self cum_while_penetrated cumshot duo ectopenis fingers_interlocked fontcest from_front_position gay gay_sex gloves grabbing_sheets gripping_sheets hooded_jacket hoodie incest indoors interlocked_fingers intertwined_fingers intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male missionary_position mmmemmo monster monster_boy orange_blush papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sequence sequential sequential_art sequential_set sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears top_papyrus uke_sans undead undertale undertale_(series) visible_breath yaoi
1boy 2020s 2021 anal animated_skeleton blue_blush blue_cum blue_hoodie blue_jacket blue_penis blush bone bottom_sans bottomless bottomless_male crying cum cum_while_penetrated cussing drooling ectopenis ectoplasm ejaculation fluids genital_fluids genitals hooded_jacket hoodie humanoid implied_masturbation insertion jacket male male_only male_penetrated monster monster_boy object_insertion penetration penis pixiv pixiv_id_3871107 profanity sans sans_(undertale) skeleton solo solo_male submissive submissive_male swearing sweat tears uke_sans undead undertale undertale_(series)
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