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Rule 34 – bbw exposed breasts fat fat ass fat belly fat hips fat thighs fluffy ears goat goat ears goat girl goat horns huge breasts lifting breast massive breasts no bra purple panties purple stockings tail talking to viewer teasing viewer text toby fox toriel undertail undertale weight gain wenisberry white fur | 8584563
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Rule 34 – 2010s animated skeleton blue blush blush bottom sans bow panties covering face crossdressing embarrassed gay hand covering face hand on face hand on own face lingerie looking away nightgown nsfwgarbagedump (artist) panties pink legwear pink nightgown pink panties pink stockings pink thighhighs sans sans (undertale) simple background skeleton solo stockings thighhighs uke sans undertail undertale undertale (series) underwear white background | 8398790
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Rule 34 – clothed ectopenis ectoplasm penis sans skeleton undertail undertale | 8099993
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Rule 34 – 1boy 2016 animated skeleton arms behind back ass up blue blush blue penis blue tongue blush bottom sans bound arms chinese text clothed crying crying with eyes open cum cum while penetrated ectopenis ectotongue english text heki (artist) implied penetration implied rape male male penetrated male rape victim miss60250 non-con non-consensual noncon nonconsensual penis pleading rape sans sans (undertale) skeleton sweat tears text tied arms tied up tongue out top-down bottom-up uke sans undead undertail undertale undertale (series) | 8155660
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Rule 34 – 1boy 2016 animated skeleton black background black tentacles blue blush blue eyes blue penis blue tongue blush bottom sans clothed crying crying with eyes open drooling ectopenis ectotongue heart heki (artist) looking down male male only miss60250 moaning penis penis out sans sans (undertale) skeleton solo male soul sweat tears tentacle tentacles around arms tentacles around wrists tentacles on male text tongue tongue out uke sans undead undertail undertale undertale (series) | 8155662
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Rule 34 – 10s 1boy 2017 animated skeleton blue blush blue eyes blue penis blue tongue blush bone bottomless bound ankles bound arms bound legs bound wrists clothed ectopenis ectotongue english text funny comments heki (artist) male male only miss60250 omorashi peeing penis sans sans (undertale) simple background skeleton solid color background solo solo male text tied ankles tied up tied wrists tongue tongue out unconscious undead undertail undertale undertale (series) urinating urination | 8155835
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Rule 34 – 1boy blush cum drooling ejaculation gl0mi heart humanoid robot jerkingoff male male masturbation male only masturbating mettaton mettaton ex monochrome orgasm penis robot robot humanoid robotic penis sketch solo solo male switch undertail undertale undertale (series) | 7902092
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Rule 34 – ahe gao ambiguous penetration anal penetration anal sex animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bigger penetrating bigger penetrating smaller blush bottom sans brother brothers clothed clothed sex clothing eli-sin-g eyes closed fontcest gay gay sex heart-shaped pupils heart eyes hoodie implied penetration implied sex incest larger penetrating larger penetrating smaller leg lift legs legs up monochrome onomatopoeia pants down papyrus papysans penetration sans seme papyrus shirt skeleton small sub small sub big dom smaller penetrated smaller sub sweat sweatdrop text thrusting into ass tongue tongue out top papyrus uke sans undertail undertale undertale (series) | 4798851
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Rule 34 – 2boys anal anal sex bigger penetrating bigger penetrating smaller blue cum blush bottom on top bottom sans cuntboy dominant pov faceless male gay hands on stomach logo (pixiv30462562) male male only pixiv id 30462562 pov sans size difference skeleton smaller penetrated smaller sub smaller submissive soul sex sweat sweating uke sans undertail undertale undertale (series) undertale sans unknown male unseen male face | 6329005
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Rule 34 – 2boys abosinsin animated skeleton bigger male bigger penetrating bigger penetrating smaller blue blush blue penis blush blushing bottom sans dialogue ectopenis ectoplasm edging english text face grab gaster gay gay sex grabbing face grabbing penis holding face incest lightsaber dick male male/male male only male penetrated male penetrating male penetrating male orgasm denial penetration penis penis grab purple blush purple penis sans sanster seme gaster skeleton smaller penetrated text top gaster uke sans undertail undertale undertale sans yaoi | 6971397
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Rule 34 – 2boys animated skeleton big dom big dom small sub bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blush blushing bottom sans crying cum in pussy cum inside faceless male gay grabbing penis holding down holding penis hoodie hoodie only larger penetrating larger penetrating smaller logo (pixiv30462562) male male only penetration pinned down pixiv id 30462562 sans skeleton small sub small sub big dom smaller penetrated soul sex sweat sweating tears uke sans undertail undertale undertale (series) undertale sans unknown male unseen male face | 6328894
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Rule 34 – <3 2boys anal sex ass up big dom big dom small sub bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blush blushing bottom sans closed eyes crying crying with eyes open cum cum in pussy cumming cuntboy dialogue dominant pov embarrassed faceless male fucked from behind gay grabbing bedding grabbing sheets gripping sheets holding hips human on humanoid japanese text larger penetrating larger penetrating smaller logo (pixiv30462562) looking back male male only monster monster boy on bed penetrating pov penetration pixiv id 30462562 pov sans simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller submissive soul sex sweat sweating tears uke sans undertail undertale undertale (series) undertale sans unknown male unseen male face yaoi | 6328965
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Rule 34 – 10s 1boy 2017 animated skeleton blue blush blue eyes blue penis blue tongue blush bone bottomless bound ankles bound arms bound legs bound wrists clothed ectopenis english text funny comments heki (artist) male male only miss60250 omorashi peeing penis sans sans (undertale) simple background skeleton solid color background solo solo male text tied ankles tied up tied wrists tongue tongue out unconscious undead undertail undertale undertale (series) urinating urination | 8155835
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Rule 34 – 5 eyes 6 arms anthro anthro only arachnid crop top eyelashes fangs female female anthro female only gloves hand on thigh long gloves midriff muffet multiple arms multiple eyes panties short twintails sleeveless sleeveless crop top sleeveless shirt smiling smoochthemskeles solo solo female spider spider girl stockings tongue out undertail undertale undertale (series) v sign wink | 8180680
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Rule 34 – 1boy 2016 animated skeleton black background black tentacles blue blush blue penis blue tongue blush bottom sans clothed crying crying with eyes open drooling ectopenis heart heki (artist) male male only miss60250 moaning penis penis out sans sans (undertale) skeleton solo male soul sweat tears tentacle tentacles around arms tentacles around wrists tentacles on male text tongue tongue out uke sans undead undertail undertale undertale (series) | 8155662
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Rule 34 – big breasts big thighs black panties blue body boobiemare boobs breasts comment icon dreamtale dreamtale (undertale fanfiction) dreamtale au ectobody female gender transformation genderbend genderbent genderswap inverted nipples killer sans like and retweet like icon mamamistake nightmare sans nightmare sans (fan character) panties retweet icon rule 63 sans sans au sans oc sanscest tagme thick thighs thighs topless topless female undertail undertale au | 4966133
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Rule 34 – big thighs blue body blue pussy bodily fluids from pussy chubby chubby female clitoris cum in pussy ectobody ectopussy neahchanart nightmare sans (fan character) pussy rule 63 sans sans au sans oc tagme thighs undertail undertale au wide hips | 4966207
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Rule 34 – fan character female licking male male/female/male megatail multiversensfw oc original character penis sans sans au sans oc skeleton skeleton girl tongue undertail undertale undertale au undertale fanfiction | 6405450
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Rule 34 – bodily fluids cross sans english text epic sans epictale fan character penis purple penis purple tongue rubber chicken sans sans au sans oc sanscest skeleton text tongue tongue out undertail undertale au xtale | 7430523
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Rule 34 – 2022 anon apologizing apology big ass big butt boots bubble butt dialogue facesitting femboy heart hottiegirl34 (artist) mettaton mettaton ex mob face robot robot boy self upload sitting on face thick thighs thighs undertail undertale undertale (series) | 7322080
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