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2boys alternate_universe anal anal_sex animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_glans blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blue_penis blurry blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position cum cumshot duo ejaculation erection from_front_position gay genital_fluids genitals glans glistening glistening_genitalia glistening_glans glistening_penis gloves grin halloween halloween_costume handwear hat headgear headwear humanoid humanoid_genitalia humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid humanoid_penis incest kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief non-human on_bottom on_top one_eye_closed orgasm papyrus penetration penile penile_penetration penis penis_in_ass power_bottom sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
2boys alternate_universe anal anal_sex animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_glans blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blue_penis blurry blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position cum cumshot duo ejaculation erection from_front_position gay genital_fluids genitals glans glistening glistening_genitalia glistening_glans glistening_penis gloves grin halloween halloween_costume handwear hat headgear headwear humanoid humanoid_genitalia humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid humanoid_penis incest kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief non-human on_bottom on_top one_eye_closed orgasm papyrus penetration penile penile_penetration penis penis_in_ass power_bottom sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
blue_eyes blue_tongue bonetrouble cum cum_on_face cum_on_tongue ectopenis grabbing_head head_grab holding_head incest papyrus_(underswap) papyrus_au sans sans_au scarf skeleton tagme tongue tongue_out underswap underswap_papyrus underswap_sans undertale_au
blue_eyes blue_tongue bonetrouble cum cum_on_face cum_on_tongue ectopenis grabbing_head head_grab holding_head incest papyrus_(underswap) papyrus_au sans sans_au scarf skeleton tagme tongue tongue_out underswap underswap_papyrus underswap_sans undertale_au
2boys animated_skeleton anterior_nasal_aperture bite biting_lip biting_own_lip blush bone bonetrouble breath brother brothers bulge bulge_frottage clothing duo frottage gay heart hoodie humanoid incest lightsaber_dick looking_pleasured male male/male male_only non-human onomatopoeia open_mouth panting papyrus sans self_bite sex sibling simple_background skeleton sound_effects teeth text topwear undead undertale video_games white_background yaoi
2boys animated_skeleton anterior_nasal_aperture bite biting_lip biting_own_lip blush bone bonetrouble breath brother brothers bulge bulge_frottage clothing duo frottage gay heart hoodie humanoid incest lightsaber_dick looking_pleasured male male/male male_only non-human onomatopoeia open_mouth panting papyrus sans self_bite sex sibling simple_background skeleton sound_effects teeth text topwear undead undertale video_games white_background yaoi
1boy animated_skeleton anterior_nasal_aperture blue_glans blue_penis bone bonetrouble clothing dialogue english_text erection funny genitals gesture glans glistening glistening_genitalia glistening_glans glistening_penis grin hoodie humanoid humanoid_genitalia humanoid_penis humor joke lightsaber_dick looking_at_viewer male male_only non-human penis sans simple_background skeleton smile solo teeth text topwear undead undertale video_games white_background
1boy animated_skeleton anterior_nasal_aperture blue_glans blue_penis bone bonetrouble clothing dialogue english_text erection funny genitals gesture glans glistening glistening_genitalia glistening_glans glistening_penis grin hoodie humanoid humanoid_genitalia humanoid_penis humor joke lightsaber_dick looking_at_viewer male male_only non-human penis sans simple_background skeleton smile solo teeth text topwear undead undertale video_games white_background
2boys 2d alternate_universe animated_skeleton blue_eyes blue_tongue blush bonetrouble ectopenis gloves heart-shaped_pupils heart_eyes humanoid incest licking licking_penis male male/male male_only male_pov non-human offscreen_character offscreen_male orange_penis papyrus_au pov sans sans_au scarf sex skeleton small_fangs star_eyes star_shaped_pupils tongue tongue_out toony underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2boys 2d alternate_universe animated_skeleton blue_eyes blue_tongue blush bonetrouble ectopenis gloves heart-shaped_pupils heart_eyes humanoid incest licking licking_penis male male/male male_only male_pov non-human offscreen_character offscreen_male orange_penis papyrus_au pov sans sans_au scarf sex skeleton small_fangs star_eyes star_shaped_pupils tongue tongue_out toony underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2boys all_fours alternate_universe ambiguous_fluids anal anal_sex animated_skeleton anterior_nasal_aperture bandana bite biting_lip biting_own_lip blue_tongue bodily_fluids bone bonetrouble closed_eyes clothing dialogue doggy_style duo english_text from_behind from_behind_position gay heart hoodie humanoid humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief penetration penile penile_penetration penis_in_ass profanity saliva sans sans_au sanscest self_bite selfcest sex simple_background skeleton smile square_crossover sweat teeth text tongue tongue_out topwear undead underswap underswap_sans undertale undertale_au video_games yaoi
2boys all_fours alternate_universe ambiguous_fluids anal anal_sex animated_skeleton anterior_nasal_aperture bandana bite biting_lip biting_own_lip blue_tongue bodily_fluids bone bonetrouble closed_eyes clothing dialogue doggy_style duo english_text from_behind from_behind_position gay heart hoodie humanoid humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief penetration penile penile_penetration penis_in_ass profanity saliva sans sans_au sanscest self_bite selfcest sex simple_background skeleton smile square_crossover sweat teeth text tongue tongue_out topwear undead underswap underswap_sans undertale undertale_au video_games yaoi
2boys big_dom_small_sub bigger_dom blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only meta_request orange_blush pants_only papyrus penis penis_grab sans sans_blush sans_eye sans_glowing_eye sans_penis shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2boys big_dom_small_sub bigger_dom blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only meta_request orange_blush pants_only papyrus penis penis_grab sans sans_blush sans_eye sans_glowing_eye sans_penis shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2023 animated_skeleton bone bonetrouble brother brothers clothing covering covering_mouth erection fellatio footwear gay genitals glowing_genitalia glowing_penis hands_covering_mouth hi_res hoodie humanoid incest licking male male/male male_only not_furry onomatopoeia oral orange_penis papyrus penile penis penis_lick red_scarf sans scarf sex sibling simple_background skeleton sound_effects text tongue tongue_out topwear undead undertale undertale_(series) yaoi
2023 animated_skeleton bone bonetrouble brother brothers clothing covering covering_mouth erection fellatio footwear gay genitals glowing_genitalia glowing_penis hands_covering_mouth hi_res hoodie humanoid incest licking male male/male male_only not_furry onomatopoeia oral orange_penis papyrus penile penis penis_lick red_scarf sans scarf sex sibling simple_background skeleton sound_effects text tongue tongue_out topwear undead undertale undertale_(series) yaoi
2boys alternate_universe animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position duo from_front_position gay gloves grin halloween halloween_costume handwear hat headgear headwear humanoid incest kerchief male male/male male_only neckerchief non-human on_bottom on_top one_eye_closed papyrus sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
2boys alternate_universe animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position duo from_front_position gay gloves grin halloween halloween_costume handwear hat headgear headwear humanoid incest kerchief male male/male male_only neckerchief non-human on_bottom on_top one_eye_closed papyrus sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi