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2010s 2017 2boys anal animated_skeleton bed bedroom black_legwear blue_blush blue_theme blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing doggy_position door duo ectotongue english_text fluids fontcest from_behind_position hooded_jacket hoodie incest indoors intraspecies jacket legwear male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy motion_lines mounting on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton spookster text thrusting tongue tongue_out top_papyrus topwear uke_sans undead undertale undertale_(series) visible_breath yaoi

2010s 2017 2boys anal animated_skeleton bed bedroom black_legwear blue_blush blue_theme blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing doggy_position door duo ectotongue english_text fluids fontcest from_behind_position hooded_jacket hoodie incest indoors intraspecies jacket legwear male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy motion_lines mounting on_bed orange_blush orange_tongue papyrus papyrus_(undertale)papysans partially_clothed partially_clothed_male penetration penetration_from_behind sans sans_(undertale)seme_papyrus sex sex_from_behind sibling_incest siblings skeleton spookster text thrusting tongue tongue_out top_papyrus topwear uke_sans undead undertale undertale_(series)visible_breath yaoi

2010s 2017 2boys anal animated_skeleton bed bedroom black_legwear blue_blush blue_theme blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing doggy_position door duo ectotongue english_text fluids fontcest from_behind_position hooded_jacket hoodie incest indoors intraspecies jacket legwear male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy motion_lines mounting on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton spookster text thrusting tongue tongue_out top_papyrus topwear uke_sans undead undertale undertale_(series) visible_breath yaoi

! !? ... 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

1boy 1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton begging_to_stop blue_blush blue_body blush bottom_sans broken_glass brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male comic comic_page comic_panel couch couch_sex crying cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male domination dubious_consent duo ectobody ectopenis ectopussy ectotongue edit edited english_text fontcest from_front_position genitals glass glowing_eye grabbing_clothing holding_glass incest intraspecies large_filesize leg_over_shoulder licking long_image male male/cuntboy male_only male_penetrating male_penetrating_cuntboy maledom missionary_position monster monster_boy multiple_images non-con non-consensual noncon nonconsensual onomatopoeia orange_blush orange_penis orange_tongue pants_around_one_leg papyrus papyrus_(undertale) papysans penetration penis_through_fly pleading profanity pussy questionable_consent rape sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_couch sibling_incest siblings skeleton sofa soul soul_sex speech_bubble submissive submissive_cuntboy supermuuh sweat talking tall_image tears teleport text text_bubble third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) unzipped unzipped_pants vaginal veiny_penis video_game_character video_games yandere yaoi