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undertale fanfiction

1girl alternate_version_available artist_name ass bete_noire betty_noire big_breasts bottom_heavy breasts brown_hair bunny bunny_tail bunnysuit clothes clothing crossover ears easter eyes fanfiction female_only glitchtale hair huge_ass huge_thighs latex living living_clothes living_clothing meta monster pink_eyes pink_hair purple_background rancher slime slime_monster slime_rancher standing tail tarr tarr_slime text thetis_(artist) thighs tight tight_clothing undertale undertale_au undertale_fanfiction
1girl alternate_version_available artist_name ass bete_noire betty_noire big_breasts bottom_heavy breasts brown_hair bunny bunny_tail bunnysuit clothes clothing crossover ears easter eyes fanfiction female_only glitchtale hair huge_ass huge_thighs latex living living_clothes living_clothing meta monster pink_eyes pink_hair purple_background rancher slime slime_monster slime_rancher standing tail tarr tarr_slime text thetis_(artist) thighs tight tight_clothing undertale undertale_au undertale_fanfiction
1girl alternate_version_available artist_name ass bete_noire betty betty_noire big_breasts bottom_heavy breasts brown_hair clothes clothing crossover female_only glitchtale huge_ass huge_thighs latex living living_clothes living_clothing monster pink_eyes pink_hair purple_background slime slime_monster slime_rancher standing tarr_slime text thetis_(artist) thighs tight_clothing undertale undertale_au undertale_fanfiction
1girl alternate_version_available artist_name ass bete_noire betty betty_noire big_breasts bottom_heavy breasts brown_hair clothes clothing crossover female_only glitchtale huge_ass huge_thighs latex living living_clothes living_clothing monster pink_eyes pink_hair purple_background slime slime_monster slime_rancher standing tarr_slime text thetis_(artist) thighs tight_clothing undertale undertale_au undertale_fanfiction
1boy 2010s 2015 animated_skeleton artist_name blue_blush blue_penis blue_tongue blush bodily_fluids bondage bottom_sans chair clothed clothing cum cussing ectopenis ectotongue english_text fluids formal formal_clothes formal_wear hand hand_on_crotch male male_focus malesub monster neck_tie necktie office_chair partially_colored penis penis_out penis_through_fly profanity sans sans_(undertale) sitting sitting_on_chair skeleton solo_focus submissive submissive_male swearing sweat text tied_up tomorobo tongue tongue_out uke_sans unbuttoned unbuttoned_shirt undead undertale undertale_(series) undertale_fanfiction vest white_background
1boy 2010s 2015 animated_skeleton artist_name blue_blush blue_penis blue_tongue blush bodily_fluids bondage bottom_sans chair clothed clothing cum cussing ectopenis ectotongue english_text fluids formal formal_clothes formal_wear hand hand_on_crotch male male_focus malesub monster neck_tie necktie office_chair partially_colored penis penis_out penis_through_fly profanity sans sans_(undertale) sitting sitting_on_chair skeleton solo_focus submissive submissive_male swearing sweat text tied_up tomorobo tongue tongue_out uke_sans unbuttoned unbuttoned_shirt undead undertale undertale_(series) undertale_fanfiction vest white_background
1futa 1girl 2023 alternate_universe areola armpits arms_up bete_noire betty_noire blue_body blue_hair blue_skin blush breasts brown_hair commission deltarune duo fellatio futadom futanari futanari_on_female glitchtale hair_over_eyes holding_legs huge_cock human humanoid humanoid_penis kris_(deltarune) kris_female_(deltarune) light-skinned_female light_skin long_hair long_nails nipples nude nude_female nude_futanari oral oral_penetration oral_sex penis pink_eyes pink_hair pink_lipstick pink_nail_polish pink_nails ruler steam tayuri undertale undertale_(series) undertale_au undertale_fanfiction
1futa 1girl 2023 alternate_universe areola armpits arms_up bete_noire betty_noire blue_body blue_hair blue_skin blush breasts brown_hair commission deltarune duo fellatio futadom futanari futanari_on_female glitchtale hair_over_eyes holding_legs huge_cock human humanoid humanoid_penis kris_(deltarune) kris_female_(deltarune) light-skinned_female light_skin long_hair long_nails nipples nude nude_female nude_futanari oral oral_penetration oral_sex penis pink_eyes pink_hair pink_lipstick pink_nail_polish pink_nails ruler steam tayuri undertale undertale_(series) undertale_au undertale_fanfiction
1boy 1girl absurd_res aged_up alternate_universe alternate_version_available areola ass ass_cleavage ass_focus bete_noire betty_noire big_ass big_breasts big_penis blush bottomless breasts brown_hair bubble_butt child_bearing_hips commission curvaceous curvy curvy_figure dark-skinned_male dat_ass dialogue digital_media dimples_of_venus doggy_position doocen drooling fat_ass female_focus femsub fucked_silly glitchtale hetero huge_ass huge_breasts huge_cock magenta_eyes male male/female maledom naked_female nipples nude one_eye_obstructed pale-skinned_female pawg penetration penetration_from_behind pink_hair pink_highlights plap pussy sex sex_from_behind solo_focus straight sweat thick_thighs thighs two_tone_hair undertale_au undertale_fanfiction vaginal_insertion vaginal_penetration vaginal_sex veiny_penis voluptuous wide_hips
1boy 1girl absurd_res aged_up alternate_universe alternate_version_available areola ass ass_cleavage ass_focus bete_noire betty_noire big_ass big_breasts big_penis blush bottomless breasts brown_hair bubble_butt child_bearing_hips commission curvaceous curvy curvy_figure dark-skinned_male dat_ass dialogue digital_media dimples_of_venus doggy_position doocen drooling fat_ass female_focus femsub fucked_silly glitchtale hetero huge_ass huge_breasts huge_cock magenta_eyes male male/female maledom naked_female nipples nude one_eye_obstructed pale-skinned_female pawg penetration penetration_from_behind pink_hair pink_highlights plap pussy sex sex_from_behind solo_focus straight sweat thick_thighs thighs two_tone_hair undertale_au undertale_fanfiction vaginal_insertion vaginal_penetration vaginal_sex veiny_penis voluptuous wide_hips
2boys 2d 2d_(artwork) animated_skeleton artist_name blanket blue_blush blue_eyes blue_penis brothers clothed counch covering_own_mouth digital_media_(artwork) duo ectopenis fontcest ganzooky handjob incest indoors male male/male male_only monster nsfwsinningsans orange_eyes papyrus papyrus_(undertale) papysans penis sans sans_(undertale) sitting sitting_on_lap skeleton undead undertale undertale_(series) undertale_fanfiction video_game_character video_games watching_tv yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name blanket blue_blush blue_eyes blue_penis brothers clothed counch covering_own_mouth digital_media_(artwork) duo ectopenis fontcest ganzooky handjob incest indoors male male/male male_only monster nsfwsinningsans orange_eyes papyrus papyrus_(undertale) papysans penis sans sans_(undertale) sitting sitting_on_lap skeleton undead undertale undertale_(series) undertale_fanfiction video_game_character video_games watching_tv yaoi
2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale) papysans penetration phone phone_call sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games white_background yaoi
2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale) papysans penetration phone phone_call sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games white_background yaoi
1girl 2020s 2023 alternate_universe bete_noire betty_noire big_breasts breasts brown_hair clothing female female_only frown glitchtale harem_outfit looking_at_viewer pink_hair pink_highlights pink_nipples pixiv purple_eyes revealing_clothes robert_rodrigez_(artist) skimpy slave_bikini sole_female solo solo_female thong undertale_au undertale_fanfiction white_background
1girl 2020s 2023 alternate_universe bete_noire betty_noire big_breasts breasts brown_hair clothing female female_only frown glitchtale harem_outfit looking_at_viewer pink_hair pink_highlights pink_nipples pixiv purple_eyes revealing_clothes robert_rodrigez_(artist) skimpy slave_bikini sole_female solo solo_female thong undertale_au undertale_fanfiction white_background
1girl alternate_universe bete_noire betty_noire big_breasts big_nipples breasts_bigger_than_head brown_hair doodle english_text female female_only glitchtale huge_breasts not_paint pink_eyes pink_hair short_hair simple_background solo solo_female teasing text undertale_au undertale_fanfiction
1girl alternate_universe bete_noire betty_noire big_breasts big_nipples breasts_bigger_than_head brown_hair doodle english_text female female_only glitchtale huge_breasts not_paint pink_eyes pink_hair short_hair simple_background solo solo_female teasing text undertale_au undertale_fanfiction
2010s 2016 2boys animated_skeleton artist_signature bigger_dom bigger_dom_smaller_sub bigger_male biting blue_blush blue_hoodie blue_jacket blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed dated deviantart fangs fontcest fully_clothed gloves gradient_background hooded_jacket hoodie humanoid imminent_rape imminent_sex incest jacket larger_male male male/male male_only monster monster_boy non-consensual nonconsensual off_shoulder one_eye_closed papyrus papyrus_(undertale) papysans red_gloves sans sans_(undertale) segamew seme_papyrus signature skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom sweat top_papyrus uke_sans undead undertale undertale_(series) undertale_fanfiction yaoi
2010s 2016 2boys animated_skeleton artist_signature bigger_dom bigger_dom_smaller_sub bigger_male biting blue_blush blue_hoodie blue_jacket blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed dated deviantart fangs fontcest fully_clothed gloves gradient_background hooded_jacket hoodie humanoid imminent_rape imminent_sex incest jacket larger_male male male/male male_only monster monster_boy non-consensual nonconsensual off_shoulder one_eye_closed papyrus papyrus_(undertale) papysans red_gloves sans sans_(undertale) segamew seme_papyrus signature skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom sweat top_papyrus uke_sans undead undertale undertale_(series) undertale_fanfiction yaoi
alternate_universe bete_noire betty_noire bettysantana breasts brown_hair chara chara_(undertale) completely_naked completely_nude female_chara female_focus frisk frisk_(undertale) glitchtale heart knife_behind_back nipples nude nude_female red_eyes solo_focus undertale undertale_(series) undertale_au undertale_fanfiction white_background
alternate_universe bete_noire betty_noire bettysantana breasts brown_hair chara chara_(undertale) completely_naked completely_nude female_chara female_focus frisk frisk_(undertale) glitchtale heart knife_behind_back nipples nude nude_female red_eyes solo_focus undertale undertale_(series) undertale_au undertale_fanfiction white_background
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans clothed digital_media_(artwork) duo echoheartx elegantfolly elemental_creature elemental_humanoid fire fire_elemental grillby grillsans humanoid imminent_sex kneel male male/male male_only monster monster_boy orange_body partially_clothed sans sans_(undertale) skeleton topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans clothed digital_media_(artwork) duo echoheartx elegantfolly elemental_creature elemental_humanoid fire fire_elemental grillby grillsans humanoid imminent_sex kneel male male/male male_only monster monster_boy orange_body partially_clothed sans sans_(undertale) skeleton topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2_girls 2girls alternate_universe amber_lightvale amber_nightvale artist_name betty_noire blue_hair breasts duo female_only frisky_69 glitchtale gradient_hair green_eyes hair_over_one_eye nipples nude nude_female scissoring undertale undertale_au undertale_fanfiction yuri
2_girls 2girls alternate_universe amber_lightvale amber_nightvale artist_name betty_noire blue_hair breasts duo female_only frisky_69 glitchtale gradient_hair green_eyes hair_over_one_eye nipples nude nude_female scissoring undertale undertale_au undertale_fanfiction yuri
2_girls 2girls alina_grey alternate_universe artist_name breasts completely_nude_female duo female_only frisky_69 glitchtale human human_only jessica_grey mother_&_daughter nipples nude nude_female pussy scissoring undertale_au undertale_fanfiction yuri
2_girls 2girls alina_grey alternate_universe artist_name breasts completely_nude_female duo female_only frisky_69 glitchtale human human_only jessica_grey mother_&_daughter nipples nude nude_female pussy scissoring undertale_au undertale_fanfiction yuri
1girl aged_up alternate_universe bete_noire betty_noire big_ass big_breasts brown_hair choker digital_media_(artwork) female female_only glitchtale gradient_hair hair_over_one_eye huge_breasts nipples not_paint pink_background pink_bikini pink_eyes pink_hair pubic_tattoo solo solo_female teasing thick_thighs undertale_au undertale_fanfiction womb_tattoo
1girl aged_up alternate_universe bete_noire betty_noire big_ass big_breasts brown_hair choker digital_media_(artwork) female female_only glitchtale gradient_hair hair_over_one_eye huge_breasts nipples not_paint pink_background pink_bikini pink_eyes pink_hair pubic_tattoo solo solo_female teasing thick_thighs undertale_au undertale_fanfiction womb_tattoo
2d 2d_(artwork) 5girls alternate_universe anthro asriel_dreemurr bete_noire betty_noire blue_background breasts brown_eyes brown_hair chara chara_(undertale) clover_(undertale_yellow) cowboy_hat digital_media_(artwork) female_anthro female_chara female_frisk female_human female_only filler_shmazman flower flowey_the_flower frisk frisk_(undertale) genderswap genderswap_(mtf) glitchtale green_eyes hairless_pussy human lenny_face looking_at_viewer multiple_girls pink_eyes pink_highlights pixiv red_eyes rosy_cheeks rule_63 simple_background tagme undertale undertale_(series) undertale_au undertale_fanfiction undertale_yellow video_games
2d 2d_(artwork) 5girls alternate_universe anthro asriel_dreemurr bete_noire betty_noire blue_background breasts brown_eyes brown_hair chara chara_(undertale) clover_(undertale_yellow) cowboy_hat digital_media_(artwork) female_anthro female_chara female_frisk female_human female_only filler_shmazman flower flowey_the_flower frisk frisk_(undertale) genderswap genderswap_(mtf) glitchtale green_eyes hairless_pussy human lenny_face looking_at_viewer multiple_girls pink_eyes pink_highlights pixiv red_eyes rosy_cheeks rule_63 simple_background tagme undertale undertale_(series) undertale_au undertale_fanfiction undertale_yellow video_games
2019 2_girls 3d 3d_(artwork) 3d_model bandage_over_one_eye big_ass black_legwear breasts brown_hair buddy_armstrong chara chara_(undertale) charalover201x completely_nude_female crossover deviantart deviantart_username female female_only interlopers lisa_(series) lisa_the_joyful lisa_the_painful long_hair nipples nude nude_female red_eyes scar scars short_hair sitting small_breasts undertale undertale_(series) undertale_fanfiction watermark
2019 2_girls 3d 3d_(artwork) 3d_model bandage_over_one_eye big_ass black_legwear breasts brown_hair buddy_armstrong chara chara_(undertale) charalover201x completely_nude_female crossover deviantart deviantart_username female female_only interlopers lisa_(series) lisa_the_joyful lisa_the_painful long_hair nipples nude nude_female red_eyes scar scars short_hair sitting small_breasts undertale undertale_(series) undertale_fanfiction watermark
2_girls 2girls 3d 3d_(artwork) bandage bandage_on_face bandage_over_one_eye big_breasts black_hair blush breasts breasts_out breasts_outside brown_hair buddy_armstrong chara chara_(undertale) charalover201x crossover deviantart deviantart_username duo female female_chara female_only flustered hand_under_chin holding_hands interlopers large_breasts lisa_(series) lisa_the_joyful lisa_the_painful long_hair naked nipples no_bra no_panties nude nude_female pink_nipples puffy_nipples red_eyes scar scars scars_all_over scars_on_face short_hair small_breasts tongue tongue_out undertale undertale_(series) undertale_fanfiction watermark yuri
2_girls 2girls 3d 3d_(artwork) bandage bandage_on_face bandage_over_one_eye big_breasts black_hair blush breasts breasts_out breasts_outside brown_hair buddy_armstrong chara chara_(undertale) charalover201x crossover deviantart deviantart_username duo female female_chara female_only flustered hand_under_chin holding_hands interlopers large_breasts lisa_(series) lisa_the_joyful lisa_the_painful long_hair naked nipples no_bra no_panties nude nude_female pink_nipples puffy_nipples red_eyes scar scars scars_all_over scars_on_face short_hair small_breasts tongue tongue_out undertale undertale_(series) undertale_fanfiction watermark yuri
1girl 7boys ahegao armpits bandages big_breasts breasts buddy_armstrong clitoris female_focus gangbang group_sex interlopers lisa_(series) lisa_the_joyful lisa_the_painful long_hair mouth_open multiple_boys multiple_penises nipples nude nude_female one_eye_covered open_mouth penis red_eyes scar solo_focus tongue tongue_out ttrop uncut undertale_fanfiction unseen_male_face very_long_hair
1girl 7boys ahegao armpits bandages big_breasts breasts buddy_armstrong clitoris female_focus gangbang group_sex interlopers lisa_(series) lisa_the_joyful lisa_the_painful long_hair mouth_open multiple_boys multiple_penises nipples nude nude_female one_eye_covered open_mouth penis red_eyes scar solo_focus tongue tongue_out ttrop uncut undertale_fanfiction unseen_male_face very_long_hair
1girl 2boys black_hair brown_eyes buddy_armstrong carrying double_penetration double_vaginal female_focus frown interlopers lisa_(series) lisa_the_joyful lisa_the_painful nearphotison nude nude_female nude_male sex solo_focus undertale_fanfiction unseen_male_face vaginal_penetration
1girl 2boys black_hair brown_eyes buddy_armstrong carrying double_penetration double_vaginal female_focus frown interlopers lisa_(series) lisa_the_joyful lisa_the_painful nearphotison nude nude_female nude_male sex solo_focus undertale_fanfiction unseen_male_face vaginal_penetration
1girl 2d 2d_(artwork) 4boys anal arachnid clitoris digital_media_(artwork) female_focus furry monster monster_girl muffet multiple_arms multiple_boys multiple_eyes penis penis_grab pussy reit solo_focus spider spider_girl spider_web undertale undertale_fanfiction unseen_male_face video_games
1girl 2d 2d_(artwork) 4boys anal arachnid clitoris digital_media_(artwork) female_focus furry monster monster_girl muffet multiple_arms multiple_boys multiple_eyes penis penis_grab pussy reit solo_focus spider spider_girl spider_web undertale undertale_fanfiction unseen_male_face video_games
2girls anthro anthro_on_human breasts dark_background deltarune female female/female female_anthro female_human female_only frisk frisk_(undertale) furry human lesbian monster monster_girl nipples pink_skin sheepy-ichigo susie_(dark_world_form) susie_(deltarune) undertale undertale_(series) undertale_fanfiction yuri
2girls anthro anthro_on_human breasts dark_background deltarune female female/female female_anthro female_human female_only frisk frisk_(undertale) furry human lesbian monster monster_girl nipples pink_skin sheepy-ichigo susie_(dark_world_form) susie_(deltarune) undertale undertale_(series) undertale_fanfiction yuri
1:1 1boy animated_skeleton blush bone clothed cum cumming cumshot ectopenis ejaculation gloves humanoid humanoid_penis lizherubones male male_masturbation male_only masturbation not_furry on_bed orgasm papyrus_(underfell) papyrus_au penile_masturbation penis red_gloves red_penis skeleton solo_male testicles undead underfell undertale_au undertale_fanfiction video_games
1:1 1boy animated_skeleton blush bone clothed cum cumming cumshot ectopenis ejaculation gloves humanoid humanoid_penis lizherubones male male_masturbation male_only masturbation not_furry on_bed orgasm papyrus_(underfell) papyrus_au penile_masturbation penis red_gloves red_penis skeleton solo_male testicles undead underfell undertale_au undertale_fanfiction video_games
2boys animated animated_skeleton blush bottom_sans brother_and_brother brothers deepthroat fellatio fontcest game games gif glowing_penis incest lizherubones male male/male male_only oral orange_penis papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au seme_papyrus sex skeleton solo_focus sucking sucking_penis swapcest top_papyrus tumblr uke_sans undead underswap undertale_au undertale_fanfiction unseen_male_face video_games yaoi
2boys animated animated_skeleton blush bottom_sans brother_and_brother brothers deepthroat fellatio fontcest game games gif glowing_penis incest lizherubones male male/male male_only oral orange_penis papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au seme_papyrus sex skeleton solo_focus sucking sucking_penis swapcest top_papyrus tumblr uke_sans undead underswap undertale_au undertale_fanfiction unseen_male_face video_games yaoi
1boy 1girl after_sex alternate_universe artist_name bent_penis bete_noire betty_noire brown_hair clothed_female_nude_male cum cum_inside female female_focus glitchtale gradient_hair grey_background heart looking_back looking_pleasured love_hearts male male/female male_pov offscreen_character penis pink_highlights pink_skirt simple_background skirt smile smiling straight sweater temmiebr_(artist) undertale undertale_au undertale_fanfiction unseen_male_face
1boy 1girl after_sex alternate_universe artist_name bent_penis bete_noire betty_noire brown_hair clothed_female_nude_male cum cum_inside female female_focus glitchtale gradient_hair grey_background heart looking_back looking_pleasured love_hearts male male/female male_pov offscreen_character penis pink_highlights pink_skirt simple_background skirt smile smiling straight sweater temmiebr_(artist) undertale undertale_au undertale_fanfiction unseen_male_face
1girl alternate_universe bete_noire betty_noire biting_clothes biting_shirt breasts female female_only glitchtale mr._nightmare_97 nipples shirt_up solo undertale_au undertale_fanfiction
1girl alternate_universe bete_noire betty_noire biting_clothes biting_shirt breasts female female_only glitchtale mr._nightmare_97 nipples shirt_up solo undertale_au undertale_fanfiction
1girl 2016 anthro big_breasts blue_eyes boss_monster breasts caprine doxy english_text erect_nipples fangame frisk frisk_(undertale) fur furry goat huge_breasts human mammal nipples pussy slightly_chubby smile text thick_thighs toriel undertale undertale_fanfiction video_games white_fur
1girl 2016 anthro big_breasts blue_eyes boss_monster breasts caprine doxy english_text erect_nipples fangame frisk frisk_(undertale) fur furry goat huge_breasts human mammal nipples pussy slightly_chubby smile text thick_thighs toriel undertale undertale_fanfiction video_games white_fur