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alternate_universe animal_humanoid anthro bodily_fluids clothing cum cum_on_viewer erection fish fish_humanoid futa_only futanari genital_fluids genitals gloves gradient_background group handwear herm humanoid intersex looking_at_viewer marine marine_humanoid multiple_futa nude penis siamkhan standing swapfell underfell underswap undertale undertale_(series) undertale_au undyne undyne_(swapfell) undyne_(underfell) undyne_(underswap) undyne_au
alternate_universe animal_humanoid anthro bodily_fluids clothing cum cum_on_viewer erection fish fish_humanoid futa_only futanari genital_fluids genitals gloves gradient_background group handwear herm humanoid intersex looking_at_viewer marine marine_humanoid multiple_futa nude penis siamkhan standing swapfell underfell underswap undertale undertale_(series) undertale_au undyne undyne_(swapfell) undyne_(underfell) undyne_(underswap) undyne_au
alternate_universe animal_humanoid anthro clothing erection fish fish_humanoid futa_only futanari genitals gloves gradient_background group handwear herm humanoid intersex looking_at_viewer marine marine_humanoid multiple_futa nude penis siamkhan standing swapfell underfell underswap undertale undertale_(series) undertale_au undertale_fanfiction undyne undyne_(swapfell) undyne_(underfell) undyne_(underswap) undyne_au
alternate_universe animal_humanoid anthro clothing erection fish fish_humanoid futa_only futanari genitals gloves gradient_background group handwear herm humanoid intersex looking_at_viewer marine marine_humanoid multiple_futa nude penis siamkhan standing swapfell underfell underswap undertale undertale_(series) undertale_au undertale_fanfiction undyne undyne_(swapfell) undyne_(underfell) undyne_(underswap) undyne_au
1girls armor blue_scarf ectobody female mochikirb rule_63 sans shortstack solo thick_thighs thighhighs thong underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale undertale_au voluptuous
1girls armor blue_scarf ectobody female mochikirb rule_63 sans shortstack solo thick_thighs thighhighs thong underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale undertale_au voluptuous
2010s 2016 2boys 2d alternate_universe animated_skeleton artist_name blush cigarette couch ectopenis heki_(artist) holding_bottle holding_cigarette holding_object humanoid incest indoors lightsaber_dick male male_only orange_penis papyrus papyrus_au penis power_bottom sans sitting sitting_on_couch sitting_on_sofa skeleton smoking sofa sweat sweatdrop underswap underswap_papyrus undertale undertale_(series) undertale_au undertale_fanfiction
2010s 2016 2boys 2d alternate_universe animated_skeleton artist_name blush cigarette couch ectopenis heki_(artist) holding_bottle holding_cigarette holding_object humanoid incest indoors lightsaber_dick male male_only orange_penis papyrus papyrus_au penis power_bottom sans sitting sitting_on_couch sitting_on_sofa skeleton smoking sofa sweat sweatdrop underswap underswap_papyrus undertale undertale_(series) undertale_au undertale_fanfiction
1boy 1girls 2d alternate_universe animated_skeleton big_breasts blue_blush blush blushing_at_viewer blushing_profusely boobjob breasts clothed cum cum_between_breasts cum_drip cum_on_breasts ectobody ectobreasts eli-sin-g female female_sans genderswap genderswap_(mtf) hard_nipples humanoid looking_at_viewer male male/female male_pov nipple_bulge offscreen_male penis penis_between_breasts pov rule_63 sans sans_au scarf sex skeleton solo_female sweat sweating underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_(series) undertale_au undertale_fanfiction
1boy 1girls 2d alternate_universe animated_skeleton big_breasts blue_blush blush blushing_at_viewer blushing_profusely boobjob breasts clothed cum cum_between_breasts cum_drip cum_on_breasts ectobody ectobreasts eli-sin-g female female_sans genderswap genderswap_(mtf) hard_nipples humanoid looking_at_viewer male male/female male_pov nipple_bulge offscreen_male penis penis_between_breasts pov rule_63 sans sans_au scarf sex skeleton solo_female sweat sweating underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_(series) undertale_au undertale_fanfiction
2boys 2d artist_request blowjob cum cum_in_mouth cum_inside humanoid incest lightsaber_dick oral orange_penis papyrus sans sex tagme underswap undertale undertale_(series)
2boys 2d artist_request blowjob cum cum_in_mouth cum_inside humanoid incest lightsaber_dick oral orange_penis papyrus sans sex tagme underswap undertale undertale_(series)
2d artist_request blush cum cumming dream_sans dream_sans_(fan_character) dreamtale error_sans_(fan_character) errortale heart holding_legs_up humanoid ink_sans_(fan_character) inktale male/male sans sans_au sanscest sex strings tagme tagme_(artist) tears tied underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2d artist_request blush cum cumming dream_sans dream_sans_(fan_character) dreamtale error_sans_(fan_character) errortale heart holding_legs_up humanoid ink_sans_(fan_character) inktale male/male sans sans_au sanscest sex strings tagme tagme_(artist) tears tied underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2boys 2d alternate_universe blush cum cumming error_sans_(fan_character) errortale fan_character gay heki_(artist) humanoid male male_only sans sans_au sanscest sex sitting sitting_on_person skeleton strings sweat tagme tied underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2boys 2d alternate_universe blush cum cumming error_sans_(fan_character) errortale fan_character gay heki_(artist) humanoid male male_only sans sans_au sanscest sex sitting sitting_on_person skeleton strings sweat tagme tied underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
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2d alternate_universe animated_skeleton anthro artist_name blush cum cumming dream_sans dream_sans_(fan_character) dreamtale fan_character heart heki_(artist) humanoid ink_sans_(fan_character) inktale lightsaber_dick male_only on_top_of_another sans sans_au sanscest sex skeleton tagme underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction white_background
2d alternate_universe animated_skeleton anthro artist_name blush cum cumming dream_sans dream_sans_(fan_character) dreamtale fan_character heart heki_(artist) humanoid ink_sans_(fan_character) inktale lightsaber_dick male_only on_top_of_another sans sans_au sanscest sex skeleton tagme underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction white_background
2018 2d animated_skeleton bored_expression casual_sex dream_sans dream_sans_(fan_character) dreamtale error_sans_(fan_character) errortale heki_(artist) holding_chocolate humanoid ink_sans_(fan_character) inktale lightsaber_dick male_only sans sans_au sanscest skeleton sweat tagme threesome underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction white_background
2018 2d animated_skeleton bored_expression casual_sex dream_sans dream_sans_(fan_character) dreamtale error_sans_(fan_character) errortale heki_(artist) holding_chocolate humanoid ink_sans_(fan_character) inktale lightsaber_dick male_only sans sans_au sanscest skeleton sweat tagme threesome underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction white_background
2boys 2d animated_skeleton bigger_male blush ectopenis embarrassed femboy gay heki_(artist) humanoid incest larger_male lightsaber_dick male male_only orange_penis papyrus_au penis penis_out sans sans_au size_difference skeleton smoking underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2boys 2d animated_skeleton bigger_male blush ectopenis embarrassed femboy gay heki_(artist) humanoid incest larger_male lightsaber_dick male male_only orange_penis papyrus_au penis penis_out sans sans_au size_difference skeleton smoking underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2016 2boys 2d animated_skeleton blowjob blowjob_pov blush bodily_fluids chinese_text cum cum_in_mouth cum_inside cumming english_text gay heki_(artist) humanoid incest male male_only orange_penis papyrus papyrus_au sans sans_au skeleton talking tears text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction unseen_male_face
2016 2boys 2d animated_skeleton blowjob blowjob_pov blush bodily_fluids chinese_text cum cum_in_mouth cum_inside cumming english_text gay heki_(artist) humanoid incest male male_only orange_penis papyrus papyrus_au sans sans_au skeleton talking tears text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction unseen_male_face
1boy 2d animated_skeleton blue_blush blush crying crying_with_eyes_open cum cum_inside cumming embarrassed fingering fingering_self gloves heki_(artist) humanoid male male_only masturbation recording sans sans_au shoes skeleton star_eyes tears underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
1boy 2d animated_skeleton blue_blush blush crying crying_with_eyes_open cum cum_inside cumming embarrassed fingering fingering_self gloves heki_(artist) humanoid male male_only masturbation recording sans sans_au shoes skeleton star_eyes tears underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2010s 2017 2boys 2d alternate_universe animated_skeleton artist_name blue_eyes blush brothers cum cum_in_pussy cumming ectopenis ectoplasm english_text gay heki_(artist) humanoid incest looking_down lowres male male_only orange_penis outside papyrus_au sans sans_au skeleton squirting text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction unseen_male_face
2010s 2017 2boys 2d alternate_universe animated_skeleton artist_name blue_eyes blush brothers cum cum_in_pussy cumming ectopenis ectoplasm english_text gay heki_(artist) humanoid incest looking_down lowres male male_only orange_penis outside papyrus_au sans sans_au skeleton squirting text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction unseen_male_face
2020 2020s 2d ? alternate_universe animated_skeleton artist_name blue_eyes blush confused confused_look confusion dream_sans dream_sans_(fan_character) dreamtale ectoplasm error_sans error_sans_(fan_character) errortale heki_(artist) humanoid ink_sans ink_sans_(fan_character) inktale male male/male male_only mars_symbol pulling_up_shirt sans sans_au sex_toy skeleton spoken_question_mark star_eyes underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction yaoi
2020 2020s 2d ? alternate_universe animated_skeleton artist_name blue_eyes blush confused confused_look confusion dream_sans dream_sans_(fan_character) dreamtale ectoplasm error_sans error_sans_(fan_character) errortale heki_(artist) humanoid ink_sans ink_sans_(fan_character) inktale male male/male male_only mars_symbol pulling_up_shirt sans sans_au sex_toy skeleton spoken_question_mark star_eyes underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction yaoi
1boy :3 bara blue_blush blue_body chubby eyes_closed humanoid jockstrap male_only man_boobs musclegut muscular_arms muscular_humanoid muscular_legs redeyedgazer skeleton slightly_chubby slightly_chubby_humanoid slightly_chubby_male stretching underswap underswap_sans undertale undertale_(series) undertale_au
1boy :3 bara blue_blush blue_body chubby eyes_closed humanoid jockstrap male_only man_boobs musclegut muscular_arms muscular_humanoid muscular_legs redeyedgazer skeleton slightly_chubby slightly_chubby_humanoid slightly_chubby_male stretching underswap underswap_sans undertale undertale_(series) undertale_au
alternate_universe anal anal_penetration anal_sex bandana blue_blush blue_body brothers chubby cum cum_in_ass cum_inside gay incest looking_at_another looking_pleasured male male/male muscular orange_blush orange_body papyrus_au penetration penis redeyedgazer sans sans_au underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au yaoi
alternate_universe anal anal_penetration anal_sex bandana blue_blush blue_body brothers chubby cum cum_in_ass cum_inside gay incest looking_at_another looking_pleasured male male/male muscular orange_blush orange_body papyrus_au penetration penis redeyedgazer sans sans_au underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au yaoi
abs anon anonymous_character bara big_chest big_pecs big_pectorals blush bottom_on_top breath chest ectobody eyes_rolling_back gay gray_background humanoid looking_pleasured male male/male male_only muscles muscular muscular_arms muscular_back muscular_humanoid muscular_legs muscular_male orange_blush orange_body orange_penis orange_tongue papyrus papyrus_(underswap) papyrus_au pecs pectorals penis redeyedgazer skeleton squatting sweat testicles underswap undertale white_pupils y/n yaoi
abs anon anonymous_character bara big_chest big_pecs big_pectorals blush bottom_on_top breath chest ectobody eyes_rolling_back gay gray_background humanoid looking_pleasured male male/male male_only muscles muscular muscular_arms muscular_back muscular_humanoid muscular_legs muscular_male orange_blush orange_body orange_penis orange_tongue papyrus papyrus_(underswap) papyrus_au pecs pectorals penis redeyedgazer skeleton squatting sweat testicles underswap undertale white_pupils y/n yaoi
2boys alternate_universe anal anal_penetration anal_sex ass bara bed big_ass big_ass_(male) big_butt big_power_bottom blush bottom_on_top bubble_ass bubble_butt bunny_ears bunnysuit butt_grab chubby dat_butt dominant_male drool dumptruck_butt ectobody eyes_rolling_back fat_ass fat_butt gay huge_ass huge_butt humanoid incest large_ass large_butt looking_back looking_down looking_pleasured male male/male massive_ass massive_butt motion_lines musclegut muscular_arms muscular_back muscular_humanoid muscular_legs on_bed on_bottom orange_body papyrus papyrus_(underswap) papyrus_au penetration penis plump_ass plump_butt power_bottom red_body redeyedgazer round_ass round_butt sans sans_(underfell) sans_au sharp_teeth skeleton slightly_chubby slightly_chubby_humanoid slightly_chubby_male small_sub_big_dom smile sweating thick_ass thick_butt tongue_out underfell underfell_sans underswap underswap_papyrus undertale_(series) undertale_au white_background yaoi
2boys alternate_universe anal anal_penetration anal_sex ass bara bed big_ass big_ass_(male) big_butt big_power_bottom blush bottom_on_top bubble_ass bubble_butt bunny_ears bunnysuit butt_grab chubby dat_butt dominant_male drool dumptruck_butt ectobody eyes_rolling_back fat_ass fat_butt gay huge_ass huge_butt humanoid incest large_ass large_butt looking_back looking_down looking_pleasured male male/male massive_ass massive_butt motion_lines musclegut muscular_arms muscular_back muscular_humanoid muscular_legs on_bed on_bottom orange_body papyrus papyrus_(underswap) papyrus_au penetration penis plump_ass plump_butt power_bottom red_body redeyedgazer round_ass round_butt sans sans_(underfell) sans_au sharp_teeth skeleton slightly_chubby slightly_chubby_humanoid slightly_chubby_male small_sub_big_dom smile sweating thick_ass thick_butt tongue_out underfell underfell_sans underswap underswap_papyrus undertale_(series) undertale_au white_background yaoi
alternate_universe ambiguous_gender anal animated_skeleton anthro artist_signature black_body ectobody ectopenis fan_character horns oc original original_character purple_body sans sans_au sans_oc sanscest self_upload sinner0w0 skeleton underswap underswap_sans undertale undertale_au ych_result
alternate_universe ambiguous_gender anal animated_skeleton anthro artist_signature black_body ectobody ectopenis fan_character horns oc original original_character purple_body sans sans_au sans_oc sanscest self_upload sinner0w0 skeleton underswap underswap_sans undertale undertale_au ych_result
concert oc original_character sans sanscest sinner0w0 straight underswap underswap_sans undertale undertale_au ych_result
concert oc original_character sans sanscest sinner0w0 straight underswap underswap_sans undertale undertale_au ych_result
ahe_gao alternate_universe animated_skeleton artist_signature big_dildo bondage bound dildo diphallia diphallism dominant dominant_male ectoplasm english_text error_sans error_sans_(fan_character) errortale fan_character gay kneeling lightsaber_dick maledom multi_penis no_humans penis sans sans_(underswap) sans_au sanscest self_upload sinner0w0 skeleton submissive text text_bubble tied_up tongue_out underswap underswap_sans undertale undertale_au white_background
ahe_gao alternate_universe animated_skeleton artist_signature big_dildo bondage bound dildo diphallia diphallism dominant dominant_male ectoplasm english_text error_sans error_sans_(fan_character) errortale fan_character gay kneeling lightsaber_dick maledom multi_penis no_humans penis sans sans_(underswap) sans_au sanscest self_upload sinner0w0 skeleton submissive text text_bubble tied_up tongue_out underswap underswap_sans undertale undertale_au white_background
2d 3girls brown_hair busty chubby female female_only frisk huge_breasts human human_female human_only hyper_breasts massive_breasts multiple_girls reallynormal shorts stockings thick_thighs toby_fox underfell underswap undertale undertale_(series) undertale_au
2d 3girls brown_hair busty chubby female female_only frisk huge_breasts human human_female human_only hyper_breasts massive_breasts multiple_girls reallynormal shorts stockings thick_thighs toby_fox underfell underswap undertale undertale_(series) undertale_au
ahe_gao blue_body blue_penis blush brosboning drool drooling ectobody gay handjob incest jerkingoff_another lightsaber_dick male male_only masturbating_other papyrus papyrus_(underswap) papyrus_au partially_clothed penis sans sans_(underswap) sans_au sitting_on_lap skeleton sweat text tongue_out underswap underswap_papyrus underswap_sans undertale_au
ahe_gao blue_body blue_penis blush brosboning drool drooling ectobody gay handjob incest jerkingoff_another lightsaber_dick male male_only masturbating_other papyrus papyrus_(underswap) papyrus_au partially_clothed penis sans sans_(underswap) sans_au sitting_on_lap skeleton sweat text tongue_out underswap underswap_papyrus underswap_sans undertale_au
blush brown_hair chara english_text female lightsaber_dick pink_blush pink_nipples red_eyes sans sex skeleton smile text_box traced underswap underswap_chara underswap_sans undertale
blush brown_hair chara english_text female lightsaber_dick pink_blush pink_nipples red_eyes sans sex skeleton smile text_box traced underswap underswap_chara underswap_sans undertale
2boys blush gay lightsaber_dick male male_only papyrus penetration sans tentacle underswap underswap_papyrus undertale
2boys blush gay lightsaber_dick male male_only papyrus penetration sans tentacle underswap underswap_papyrus undertale
2boys alternate_universe anal animated_skeleton ass big_ass big_butt blue_body blue_eyes butt catyuffie ectobody ectobutt femboy gay penis powder_sans sans sans_au sans_oc skeleton third-party_edit tumblr_username underswap underswap_sans undertale undertale_au yaoi
2boys alternate_universe anal animated_skeleton ass big_ass big_butt blue_body blue_eyes butt catyuffie ectobody ectobutt femboy gay penis powder_sans sans sans_au sans_oc skeleton third-party_edit tumblr_username underswap underswap_sans undertale undertale_au yaoi
blush clothed_sex drooling dry_humping heart_emote sans sans_(underfell) sans_(underswap) skeleton standing_sex underfell underfell_sans underswap underswap_sans undertale undertale_au yaoi
blush clothed_sex drooling dry_humping heart_emote sans sans_(underfell) sans_(underswap) skeleton standing_sex underfell underfell_sans underswap underswap_sans undertale undertale_au yaoi
2d crying crying_with_eyes_open cum cum_inside ganzooky hazy_eyes humanoid incest monochrome papyrus papyrus_(underswap) papyrus_au penetration sans sans_(underfell) sans_au sex tagme tongue tongue_out underfell underfell_sans underswap underswap_papyrus undertale_(series) undertale_au
2d crying crying_with_eyes_open cum cum_inside ganzooky hazy_eyes humanoid incest monochrome papyrus papyrus_(underswap) papyrus_au penetration sans sans_(underfell) sans_au sex tagme tongue tongue_out underfell underfell_sans underswap underswap_papyrus undertale_(series) undertale_au
1boy animated_skeleton blush clothing covering_mouth covering_own_mouth crying egg_vibrator hand_covering_mouth hoodie male male_only mattress_grab pants_down papyrus papyrus_(underswap) papyrus_au sex_toy skeleton underswap underswap_papyrus undertale_au vibrator vibrator_cord
1boy animated_skeleton blush clothing covering_mouth covering_own_mouth crying egg_vibrator hand_covering_mouth hoodie male male_only mattress_grab pants_down papyrus papyrus_(underswap) papyrus_au sex_toy skeleton underswap underswap_papyrus undertale_au vibrator vibrator_cord
animated_skeleton crying crying_with_eyes_open harness harness_gag implied_incest male male_only papyrus psicro_(artist) sans sans_(underswap) sans_au skeleton star_eyes sweat tears text tongue tongue_out underswap underswap_sans undertale_au
animated_skeleton crying crying_with_eyes_open harness harness_gag implied_incest male male_only papyrus psicro_(artist) sans sans_(underswap) sans_au skeleton star_eyes sweat tears text tongue tongue_out underswap underswap_sans undertale_au
animated_skeleton ball_gag bondage crossdressing dress looking_at_viewer male_only psicro_(artist) rope rope_bondage sans sans_(underswap) sans_au skeleton solo tied_up underswap underswap_sans undertale_au
animated_skeleton ball_gag bondage crossdressing dress looking_at_viewer male_only psicro_(artist) rope rope_bondage sans sans_(underswap) sans_au skeleton solo tied_up underswap underswap_sans undertale_au
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
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
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