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1girls alternate_universe blue_body blue_breasts blue_eyes blue_sans_penis blue_sans_tongue breasts buck_tooth ectobody ectobreasts ectopussy female_sans gloves grey_background meta_request no_bra no_panties rule_63 sans sans_(underswap) sans_au sans_glowing_eye scarf shirt_up skeleton star_eyes underswap underswap_sans underswap_sans_genderswap undertale_au wor_mspit
1girls alternate_universe blue_body blue_breasts blue_eyes blue_sans_penis blue_sans_tongue breasts buck_tooth ectobody ectobreasts ectopussy female_sans gloves grey_background meta_request no_bra no_panties rule_63 sans sans_(underswap) sans_au sans_glowing_eye scarf shirt_up skeleton star_eyes underswap underswap_sans underswap_sans_genderswap undertale_au wor_mspit
2d after_sex blue_body comic cum cum_in_ass cum_inside dialogue ectobody english_dialogue english_text male male_only mellednsfw papyrus_au penetration red_body sans sans_au sanscest sex talking text underfell underfell_papyrus underfell_sans underswap underswap_sans undertale undertale_(series) undertale_au
2d after_sex blue_body comic cum cum_in_ass cum_inside dialogue ectobody english_dialogue english_text male male_only mellednsfw papyrus_au penetration red_body sans sans_au sanscest sex talking text underfell underfell_papyrus underfell_sans underswap underswap_sans undertale undertale_(series) undertale_au
alternate_universe anthro arachnid arthropod asriel_dreemurr blush boss boss_monster_(undertale) chastity_cage chastity_device clothing comic dracozhilla duo embarrassed female femboy hi_res humanoid key larger_male maid_uniform male male/female muffet muffet_(underswap) panties size_difference smaller_female spider text underswap undertale undertale_(series) underwear uniform
alternate_universe anthro arachnid arthropod asriel_dreemurr blush boss boss_monster_(undertale) chastity_cage chastity_device clothing comic dracozhilla duo embarrassed female femboy hi_res humanoid key larger_male maid_uniform male male/female muffet muffet_(underswap) panties size_difference smaller_female spider text underswap undertale undertale_(series) underwear uniform
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
2boys 2d blue_blush blue_eyes blue_tongue blush blushing_profusely cum gay incest long_tongue male male/male male_focus male_only orange_penis papyrus sans sans_au scarf skeleton tagme underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
2boys 2d blue_blush blue_eyes blue_tongue blush blushing_profusely cum gay incest long_tongue male male/male male_focus male_only orange_penis papyrus sans sans_au scarf skeleton tagme underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction
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
1girls 2d 2d_(artwork) 2d_artwork big_breasts blue_eyes blue_gloves blush bones breasts color dialogue english english_dialogue english_text female female_only female_sans genderswap genderswap_(mtf) gloves humanized nuvex open_mouth rule_63 sans sans_au short_skirt skirt solo solo_female text underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale undertale_(series) undertale_au white-skinned_female white_hair
1girls 2d 2d_(artwork) 2d_artwork big_breasts blue_eyes blue_gloves blush bones breasts color dialogue english english_dialogue english_text female female_only female_sans genderswap genderswap_(mtf) gloves humanized nuvex open_mouth rule_63 sans sans_au short_skirt skirt solo solo_female text underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale undertale_(series) undertale_au white-skinned_female white_hair
2019 3boys black_hoodie blowjob blue_blush blue_dick blue_eyes blue_hoodie blue_penis blue_pupils blue_testicles blue_tongue bodily_fluids cum cum_in_mouth cum_on_tongue fellatio gay genital_fluids hands_in_pockets heart hearts hoodie humanoid_penis lizheru lizherubones male male/male meta_request penis red_penis sans sans_blush sans_eye sans_glowing_eye sans_penis sanscest selfcest skeleton square_crossover star-shaped_pupils starry_eyes text underfell underfell_sans underswap underswap_sans undertale undertale_fanfiction undertale_sans video_games
2019 3boys black_hoodie blowjob blue_blush blue_dick blue_eyes blue_hoodie blue_penis blue_pupils blue_testicles blue_tongue bodily_fluids cum cum_in_mouth cum_on_tongue fellatio gay genital_fluids hands_in_pockets heart hearts hoodie humanoid_penis lizheru lizherubones male male/male meta_request penis red_penis sans sans_blush sans_eye sans_glowing_eye sans_penis sanscest selfcest skeleton square_crossover star-shaped_pupils starry_eyes text underfell underfell_sans underswap underswap_sans undertale undertale_fanfiction undertale_sans video_games
16-bit big_thighs black_background blue_body blue_scarf breasts demonmoxx ectobody ectobreasts ectopussy genderswap nipples pixel_art pussy rule_63 sans sans_(underswap) sans_au scarf skeleton sprite_art sprite_sheet thick_thighs underswap underswap_sans undertale_au v_sign white_outline
16-bit big_thighs black_background blue_body blue_scarf breasts demonmoxx ectobody ectobreasts ectopussy genderswap nipples pixel_art pussy rule_63 sans sans_(underswap) sans_au scarf skeleton sprite_art sprite_sheet thick_thighs underswap underswap_sans undertale_au v_sign white_outline
!! 2d acidd_grrs alternate_universe animated_skeleton artist_name blue_body blue_breasts blush brother_and_sister chubby chubby_female closed_eyes color ectobody ectobreasts exclamation_point female genderswap_(mtf) half-dressed heart hetero incest male male/female male_penetrating orange_body orange_hoodie pants_down papyrus_(underswap) papyrus_au rule_63 sans simple_background skeleton straight taller_male uncensored underswap underswap_papyrus undertale undertale_(series) undertale_au white_background
!! 2d acidd_grrs alternate_universe animated_skeleton artist_name blue_body blue_breasts blush brother_and_sister chubby chubby_female closed_eyes color ectobody ectobreasts exclamation_point female genderswap_(mtf) half-dressed heart hetero incest male male/female male_penetrating orange_body orange_hoodie pants_down papyrus_(underswap) papyrus_au rule_63 sans simple_background skeleton straight taller_male uncensored underswap underswap_papyrus undertale undertale_(series) undertale_au white_background
alternate_universe anthro arachnid arthropod asriel_dreemurr blush boss boss_monster_(undertale) clothing comic dracozhilla duo embarrassed female femboy hi_res humanoid larger_male maid_uniform male male/female muffet muffet_(underswap) size_difference smaller_female spider text underswap undertale undertale_(series) uniform
alternate_universe anthro arachnid arthropod asriel_dreemurr blush boss boss_monster_(undertale) clothing comic dracozhilla duo embarrassed female femboy hi_res humanoid larger_male maid_uniform male male/female muffet muffet_(underswap) size_difference smaller_female spider text underswap undertale undertale_(series) uniform
2016 blush bone clothed clothed_sex clothing colored_cum cum cum_on_face cum_on_hand cum_on_tongue english_text glowing glowing_eyes heart implied_incest incest nsfwshamecave sans sans_au sex skeleton tagme text tongue tongue_out undead underfell underfell_sans underlust underlust_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans unusual_cum
2016 blush bone clothed clothed_sex clothing colored_cum cum cum_on_face cum_on_hand cum_on_tongue english_text glowing glowing_eyes heart implied_incest incest nsfwshamecave sans sans_au sex skeleton tagme text tongue tongue_out undead underfell underfell_sans underlust underlust_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans unusual_cum
2d 3boys blowjob bondage comic cum cum_in_mouth cum_in_pants cum_inside cum_on_face english_text fellatio forced_to_watch gay gay_sex helpless humanoid incest ksuriuri male male/male male_only papyrus_(underfell) papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au talking text underfell underfell_papyrus underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction yaoi
2d 3boys blowjob bondage comic cum cum_in_mouth cum_in_pants cum_inside cum_on_face english_text fellatio forced_to_watch gay gay_sex helpless humanoid incest ksuriuri male male/male male_only papyrus_(underfell) papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au talking text underfell underfell_papyrus underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction yaoi
anal gay incest male_only papyrus sans underfell underfell_papyrus underswap underswap_sans undertale undertale_fanfiction
anal gay incest male_only papyrus sans underfell underfell_papyrus underswap underswap_sans undertale undertale_fanfiction
female_only huge_ass huge_breasts rule_63 sans the_absolute underswap underswap_sans undertale video_game video_games
female_only huge_ass huge_breasts rule_63 sans the_absolute underswap underswap_sans undertale video_game video_games
2019 2boys 2d artist_name bandana black_sweatpants blue_bandana blue_blush blue_eyes blue_scarf bone ectopenis grumpy grumpy_sub hoodie hugging_penis humanoid incest lizheru lizherubones male male/male male_only orange_hoodie orange_penis papyrus_au penis sans sans_au scarf shoulder_pads simple_background skeleton solo_focus starry_eyes sweatpants text underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction unseen_male_face white_background
2019 2boys 2d artist_name bandana black_sweatpants blue_bandana blue_blush blue_eyes blue_scarf bone ectopenis grumpy grumpy_sub hoodie hugging_penis humanoid incest lizheru lizherubones male male/male male_only orange_hoodie orange_penis papyrus_au penis sans sans_au scarf shoulder_pads simple_background skeleton solo_focus starry_eyes sweatpants text underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction unseen_male_face white_background
breasts female_sans rule_63 sans sans_au the_absolute thighhighs thighs underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_au
breasts female_sans rule_63 sans sans_au the_absolute thighhighs thighs underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_au
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
3boys anal anal_insertion anal_sex blowjob cum_in_ass cum_in_pussy cum_inside double_penetration female sans sans_au sanscest skeleton swapfell underfell underfell_sans underswap underswap_sans undertale undertale_au vaginal_insertion vaginal_penetration vaginal_sex
3boys anal anal_insertion anal_sex blowjob cum_in_ass cum_in_pussy cum_inside double_penetration female sans sans_au sanscest skeleton swapfell underfell underfell_sans underswap underswap_sans undertale undertale_au vaginal_insertion vaginal_penetration vaginal_sex
2boys 2d ball_gag bonez dog_collar gay incest male male_only papyrus put2littlemore sans sans_au sex tagme underfell underfell_papyrus underswap underswap_sans undertale undertale_(series)
2boys 2d ball_gag bonez dog_collar gay incest male male_only papyrus put2littlemore sans sans_au sex tagme underfell underfell_papyrus underswap underswap_sans undertale undertale_(series)
2boys 2d abosinsin alternate_universe animated_skeleton big_dom_small_sub blush color english_text face_out_of_frame gay incest male male_only moaning monster monster_boy papyrus papyrus_au sans sans_au sex skeleton sweat tagme tears text tongue_out tugging_clothing twitching underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au
2boys 2d abosinsin alternate_universe animated_skeleton big_dom_small_sub blush color english_text face_out_of_frame gay incest male male_only moaning monster monster_boy papyrus papyrus_au sans sans_au sex skeleton sweat tagme tears text tongue_out tugging_clothing twitching underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au
2020 2d ass bandana big_ass black_panties black_sclera blue_bandana blue_blush blue_eyes blue_scarf blue_shirt ectobody from_behind huge_ass humanoid multicolored_panties panties pink_panties purple_panties scarf skeleton starry_eyes stars_in_eyes tagme underswap underswap_sans undertale_(series) undertale_fanfiction unknown_artist white_panties yellow_eyes
2020 2d ass bandana big_ass black_panties black_sclera blue_bandana blue_blush blue_eyes blue_scarf blue_shirt ectobody from_behind huge_ass humanoid multicolored_panties panties pink_panties purple_panties scarf skeleton starry_eyes stars_in_eyes tagme underswap underswap_sans undertale_(series) undertale_fanfiction unknown_artist white_panties yellow_eyes
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
1girls 2d acidd_grrs biting_lip blush color cum_in_pussy dialogue ectobody english english_text female_sans genderswap_(mtf) heart incest male_penetrating naked_female nude_female papyrus papyrus_au rule_63 sans sans_au skeleton sweat tagme text uncensored uncensored_breasts uncensored_penis uncensored_vagina underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au
1girls 2d acidd_grrs biting_lip blush color cum_in_pussy dialogue ectobody english english_text female_sans genderswap_(mtf) heart incest male_penetrating naked_female nude_female papyrus papyrus_au rule_63 sans sans_au skeleton sweat tagme text uncensored uncensored_breasts uncensored_penis uncensored_vagina underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au
2boys ass big_ass big_butt blush butt comic_page cunnilingus femboy gay incest papyrus sans sharp_teeth split_tongue underfell underfell_papyrus underswap underswap_sans undertale undertale_fanfiction yaoi
2boys ass big_ass big_butt blush butt comic_page cunnilingus femboy gay incest papyrus sans sharp_teeth split_tongue underfell underfell_papyrus underswap underswap_sans undertale undertale_fanfiction yaoi
alternate_universe animated_skeleton bone brother brothers duo ectopenis glowing_penis hi_res humanoid incest lizheru lizherubones male male_only oral papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sex sibling skeleton solo_focus television undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games
alternate_universe animated_skeleton bone brother brothers duo ectopenis glowing_penis hi_res humanoid incest lizheru lizherubones male male_only oral papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sex sibling skeleton solo_focus television undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games
2018 2d 3boys alternate_universe animated_skeleton blue_penis blush bodily_fluids bone bottomwear brother brothers clothing color cunnilingus cuntboy cuntboy_sans_balls footwear gay genital_fluids genitals gloves group handwear herm hermaphrodite humanoid incest intersex kerchief licking male male/male male_on_maleherm maleherm multi_genitalia oral orange_tongue papyrus papyrus_(underfell) papyrus_(underswap) penile penis penis_lick precum pussy red_penis sans sans_(underswap) scarf sex sibling simple_background skeleton theyaois_(artist) threesome tongue tongue_out topwear trio uncensored undead underfell underswap undertale undertale_(series) undertale_au yaoi
2018 2d 3boys alternate_universe animated_skeleton blue_penis blush bodily_fluids bone bottomwear brother brothers clothing color cunnilingus cuntboy cuntboy_sans_balls footwear gay genital_fluids genitals gloves group handwear herm hermaphrodite humanoid incest intersex kerchief licking male male/male male_on_maleherm maleherm multi_genitalia oral orange_tongue papyrus papyrus_(underfell) papyrus_(underswap) penile penis penis_lick precum pussy red_penis sans sans_(underswap) scarf sex sibling simple_background skeleton theyaois_(artist) threesome tongue tongue_out topwear trio uncensored undead underfell underswap undertale undertale_(series) undertale_au yaoi
2017 3boys anal_tail animal_ears animal_tail artist_request ass backsack balls blue_blush blue_body blue_hoodie blush bunny_boy bunny_ears bunny_humanoid bunny_tail butt buttplug cat_boy cat_ears cat_humanoid cat_tail catboy ectobody gray_fur grey_fur looking_back looking_behind male male_only pink_fur presenting rabbit_ears rabbit_tail rainbow_background red_blush red_body red_hoodie sans sans_au sex_toy tail tail_wrapped_around_balls testicles trio underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans white_fur wolf_boy wolf_ears wolf_humanoid wolf_tail
2017 3boys anal_tail animal_ears animal_tail artist_request ass backsack balls blue_blush blue_body blue_hoodie blush bunny_boy bunny_ears bunny_humanoid bunny_tail butt buttplug cat_boy cat_ears cat_humanoid cat_tail catboy ectobody gray_fur grey_fur looking_back looking_behind male male_only pink_fur presenting rabbit_ears rabbit_tail rainbow_background red_blush red_body red_hoodie sans sans_au sex_toy tail tail_wrapped_around_balls testicles trio underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans white_fur wolf_boy wolf_ears wolf_humanoid wolf_tail
1girls breasts female_sans humanized rule_63 sans sans_(underswap) sans_au spookdx tagme tagme_(character) thighhighs thighs underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_au white_background white_hair
1girls breasts female_sans humanized rule_63 sans sans_(underswap) sans_au spookdx tagme tagme_(character) thighhighs thighs underswap underswap_genderswap underswap_sans underswap_sans_genderswap undertale_au white_background white_hair
1girls 2d 5_fingers acidd_grrs blue_gloves blush color dialogue english english_dialogue english_text female_sans fully_clothed genderswap_(mtf) gloves hard_on heart incest legs_held_open papyrus papyrus_au rule_63 sans sans_au scarf skeleton tagme text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au watermark why
1girls 2d 5_fingers acidd_grrs blue_gloves blush color dialogue english english_dialogue english_text female_sans fully_clothed genderswap_(mtf) gloves hard_on heart incest legs_held_open papyrus papyrus_au rule_63 sans sans_au scarf skeleton tagme text underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au watermark why
2d 3boys english_text forced_yaoi humanoid imminent_rape imminent_sex incest male male_only papyrus papyrus_(underswap) papyrus_au rape robot_kin sans sans_au sanscest selfcest skeleton spitroast tagme talking text underfell underfell_sans underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2d 3boys english_text forced_yaoi humanoid imminent_rape imminent_sex incest male male_only papyrus papyrus_(underswap) papyrus_au rape robot_kin sans sans_au sanscest selfcest skeleton spitroast tagme talking text underfell underfell_sans underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2d color ectopenis error_sans error_sans_(fan_character) errortale maten sans sans_au sanscest tagme underswap underswap_sans undertale undertale_(series) undertale_au voodoo voodoo_penetration voodoo_sex
2d color ectopenis error_sans error_sans_(fan_character) errortale maten sans sans_au sanscest tagme underswap underswap_sans undertale undertale_(series) undertale_au voodoo voodoo_penetration voodoo_sex
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
cape dream_sans dream_sans_(fan_character) female huge_ass huge_breasts ink_sans_(fan_character) queen rule_63 sans the_absolute thiccberry underswap undertale undertale_fanfiction
cape dream_sans dream_sans_(fan_character) female huge_ass huge_breasts ink_sans_(fan_character) queen rule_63 sans the_absolute thiccberry underswap undertale undertale_fanfiction
! 1:1 animated_skeleton blue_tongue bone duo english_text humanoid humanoid_penis lizheru lizherubones male male/male penis red_penis sans skeleton text tongue undead underswap undertale undertale_fanfiction video_games
! 1:1 animated_skeleton blue_tongue bone duo english_text humanoid humanoid_penis lizheru lizherubones male male/male penis red_penis sans skeleton text tongue undead underswap undertale undertale_fanfiction video_games
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