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1boy 1girl anonymous_male anus ass big_ass breasts cum cum_in_pussy cum_inside dark_violet_eyes dark_violet_hair eolia_34 flushed_face goth gothic_girl gotica_culona hand human large_hair long_hair looking_back_at_viewer pale-skinned_female pale_skin pandora_(saint_seiya) penetration penis penis_in_pussy pubic_hair reverse_cowgirl_position saint_seiya sentones sex sex_from_behind shounen_jump spanish_text specters thick_thighs vaginal vaginal_penetration vaginal_sex villainess violation wide_hips
1boy 1girl anonymous_male anus ass big_ass breasts cum cum_in_pussy cum_inside dark_violet_eyes dark_violet_hair eolia_34 flushed_face goth gothic_girl gotica_culona hand human large_hair long_hair looking_back_at_viewer pale-skinned_female pale_skin pandora_(saint_seiya) penetration penis penis_in_pussy pubic_hair reverse_cowgirl_position saint_seiya sentones sex sex_from_behind shounen_jump spanish_text specters thick_thighs vaginal vaginal_penetration vaginal_sex villainess violation wide_hips
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous arm_support artist_name ass bittersweetdeath black_tank_top blue_blush blue_penis blush bodily_fluids bottomless bottomless_male cum cum_stain digital_media_(artwork) duo ectopenis english_text fluids hand heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket looking_pleasured male male_focus micro micro_male microphilia monster monster_boy penis red_hoodie red_jacket sans sans_(undertale) semen simple_background size_difference skeleton smaller_male smooth_penis solo_focus submissive submissive_male sweat talking talking_to_viewer tank_top text undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous arm_support artist_name ass bittersweetdeath black_tank_top blue_blush blue_penis blush bodily_fluids bottomless bottomless_male cum cum_stain digital_media_(artwork) duo ectopenis english_text fluids hand heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket looking_pleasured male male_focus micro micro_male microphilia monster monster_boy penis red_hoodie red_jacket sans sans_(undertale) semen simple_background size_difference skeleton smaller_male smooth_penis solo_focus submissive submissive_male sweat talking talking_to_viewer tank_top text undead undertale undertale_(series) video_game_character video_games
1:1 1:1_aspect_ratio 1boy 1cuntboy 2010s 2017 2d 2d_(artwork) ahegao animated_skeleton anon anonymous blue_blush blue_clitoris blue_penis blue_pussy blue_tongue blush bottom_sans bottomless bottomless_male candle clitoris closed_eyes clothed clothed_male clothing cum cumshot cuntboy cuntboysub digital_media_(artwork) disembodied_hand drooling ectopenis ectoplasm ectopussy ectotongue ejaculation english_text erect_penis erection hand hoodie jacket kneel looking_pleasured male male_ahegao male_focus male_moaning malesub masturbation micro micro_male microphilia moaning monochrome monster multiple_views nude nude_male orgasm partially_clothed partially_clothed_male partially_colored penetration penis phone pleasure_face plushie pussy sans sans_(undertale) sex simple_background size_difference skeleton slippers small_penis smaller_male smartphone smooth_penis socks solo_focus solo_male speech_bubble submissive submissive_cuntboy submissive_male tears text the-shewolf-den tongue tongue_out topwear uke_sans undead undertale undertale_(series) vibrating video_game_character video_games
1:1 1:1_aspect_ratio 1boy 1cuntboy 2010s 2017 2d 2d_(artwork) ahegao animated_skeleton anon anonymous blue_blush blue_clitoris blue_penis blue_pussy blue_tongue blush bottom_sans bottomless bottomless_male candle clitoris closed_eyes clothed clothed_male clothing cum cumshot cuntboy cuntboysub digital_media_(artwork) disembodied_hand drooling ectopenis ectoplasm ectopussy ectotongue ejaculation english_text erect_penis erection hand hoodie jacket kneel looking_pleasured male male_ahegao male_focus male_moaning malesub masturbation micro micro_male microphilia moaning monochrome monster multiple_views nude nude_male orgasm partially_clothed partially_clothed_male partially_colored penetration penis phone pleasure_face plushie pussy sans sans_(undertale) sex simple_background size_difference skeleton slippers small_penis smaller_male smartphone smooth_penis socks solo_focus solo_male speech_bubble submissive submissive_cuntboy submissive_male tears text the-shewolf-den tongue tongue_out topwear uke_sans undead undertale undertale_(series) vibrating video_game_character video_games
1boy 2010s 2016 2d 2d_(artwork) anal animated_skeleton anon anonymous artist_name bittersweetdeath blue_blush blue_penis blue_tongue blush bottom_sans closed_eyes completely_nude completely_nude_male digital_media_(artwork) disembodied_hand disembodied_hands drooling ectoplasm ectotongue fluids hand hands heart_eyes macrophilia male male_focus male_moaning micro micro_male microphilia moaning monster nude nude_male penetration pink_background sans sans_(undertale) sex simple_background size_difference skeleton smaller_male solid_color_background solo_focus solo_male spoken_heart spread_legs submissive submissive_male tongue tongue_out trembling trembling_legs uke_sans undead undertale undertale_(series) video_games
1boy 2010s 2016 2d 2d_(artwork) anal animated_skeleton anon anonymous artist_name bittersweetdeath blue_blush blue_penis blue_tongue blush bottom_sans closed_eyes completely_nude completely_nude_male digital_media_(artwork) disembodied_hand disembodied_hands drooling ectoplasm ectotongue fluids hand hands heart_eyes macrophilia male male_focus male_moaning micro micro_male microphilia moaning monster nude nude_male penetration pink_background sans sans_(undertale) sex simple_background size_difference skeleton smaller_male solid_color_background solo_focus solo_male spoken_heart spread_legs submissive submissive_male tongue tongue_out trembling trembling_legs uke_sans undead undertale undertale_(series) video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous arm_support ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media_(artwork) disembodied_hand drooling duo ectopenis erect_penis erection green_background hand heart-shaped_pupils heart_eyes licking licking_penis macrophilia male male_focus male_moaning malesub micro micro_male microphilia moaning monster nose_piercing nude nude_male oral penis penis_on_tongue piercing precum saliva sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus spoken_heart standing sweat text tongue undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous arm_support ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media_(artwork) disembodied_hand drooling duo ectopenis erect_penis erection green_background hand heart-shaped_pupils heart_eyes licking licking_penis macrophilia male male_focus male_moaning malesub micro micro_male microphilia moaning monster nose_piercing nude nude_male oral penis penis_on_tongue piercing precum saliva sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus spoken_heart standing sweat text tongue undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous artist_name ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media_(artwork) disembodied_hand drooling duo ectopenis ectoplasm erect_penis erection green_background hand heart-shaped_pupils heart_eyes macrophilia male male_focus malesub micro micro_male microphilia monster monster_boy nude nude_male penis sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus solo_male standing submissive submissive_male undead undertale undertale_(series) video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton anon anonymous artist_name ass bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male cum digital_media_(artwork) disembodied_hand drooling duo ectopenis ectoplasm erect_penis erection green_background hand heart-shaped_pupils heart_eyes macrophilia male male_focus malesub micro micro_male microphilia monster monster_boy nude nude_male penis sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male smooth_penis solid_color_background solo_focus solo_male standing submissive submissive_male undead undertale undertale_(series) video_games
3d 3d_model animal_genitalia animal_penis beastiality black_background daz3d daz_studio emily_summers equine equine_genitalia equine_penis genitals hand horse horse_penis horsecock huge_cock original original_character penis pleasuree3dx thumbs_up zoophilia
3d 3d_model animal_genitalia animal_penis beastiality black_background daz3d daz_studio emily_summers equine equine_genitalia equine_penis genitals hand horse horse_penis horsecock huge_cock original original_character penis pleasuree3dx thumbs_up zoophilia
1boy 1kogito 1kogito1 2020s 2023 animated_skeleton anon anonymous bed_sheet blush blush_lines bottom_sans bottomless drooling grabbing_sheets gripping_sheets hand laying_on_back laying_on_bed lying_on_back lying_on_bed male male_focus male_only malesub monster nude pov sans sans_(undertale) simple_background skeleton solo_male submissive submissive_male sweat topless uke_sans undead undertale undertale_(series) video_games white_background
1boy 1kogito 1kogito1 2020s 2023 animated_skeleton anon anonymous bed_sheet blush blush_lines bottom_sans bottomless drooling grabbing_sheets gripping_sheets hand laying_on_back laying_on_bed lying_on_back lying_on_bed male male_focus male_only malesub monster nude pov sans sans_(undertale) simple_background skeleton solo_male submissive submissive_male sweat topless uke_sans undead undertale undertale_(series) video_games white_background
!! 1girl 2010s 2018 2d 2d_(artwork) alternate_version_available animated_skeleton arm_support backwards_clothing backwards_virgin_killer_sweater belly big_breasts black_legwear black_stockings black_thighhighs blue_belly blue_blush blue_body blue_breasts blush breasts chubby chubby_female clothed clothing digital_media_(artwork) ectobelly ectobody ectobreasts edit edited english_text exclamation_mark exclamation_point female_focus female_sans genderswap genderswap_(mtf) gif hand kneel legwear looking_at_hand looking_down meme meme_attire meme_clothing monster sans sans_(undertale) sequence sequential simple_background sitting skeleton slideshow solo_focus stockings surprised_expression sweater sympharin symphysins text thighs third-party_edit twitter undead undertale undertale_(series) video_game_character video_games virgin_killer_sweater white_background
!! 1girl 2010s 2018 2d 2d_(artwork) alternate_version_available animated_skeleton arm_support backwards_clothing backwards_virgin_killer_sweater belly big_breasts black_legwear black_stockings black_thighhighs blue_belly blue_blush blue_body blue_breasts blush breasts chubby chubby_female clothed clothing digital_media_(artwork) ectobelly ectobody ectobreasts edit edited english_text exclamation_mark exclamation_point female_focus female_sans genderswap genderswap_(mtf) gif hand kneel legwear looking_at_hand looking_down meme meme_attire meme_clothing monster sans sans_(undertale) sequence sequential simple_background sitting skeleton slideshow solo_focus stockings surprised_expression sweater sympharin symphysins text thighs third-party_edit twitter undead undertale undertale_(series) video_game_character video_games virgin_killer_sweater white_background
!! 1girl 2010s 2018 2d 2d_(artwork) alternate_version_available animated_skeleton arm_support backwards_clothing backwards_virgin_killer_sweater belly big_breasts black_legwear black_stockings black_thighhighs blue_belly blue_blush blue_body blue_breasts blush breasts chubby chubby_female clothed clothing digital_media_(artwork) ectobelly ectobody ectobreasts english_text exclamation_mark exclamation_point female_focus female_sans genderswap genderswap_(mtf) hand kneel legwear looking_at_hand looking_down meme meme_attire meme_clothing monster sans sans_(undertale) sequence sequential simple_background sitting skeleton solo_focus stockings surprised_expression sweater sympharin symphysins text thighs twitter undead undertale undertale_(series) video_game_character video_games virgin_killer_sweater white_background
!! 1girl 2010s 2018 2d 2d_(artwork) alternate_version_available animated_skeleton arm_support backwards_clothing backwards_virgin_killer_sweater belly big_breasts black_legwear black_stockings black_thighhighs blue_belly blue_blush blue_body blue_breasts blush breasts chubby chubby_female clothed clothing digital_media_(artwork) ectobelly ectobody ectobreasts english_text exclamation_mark exclamation_point female_focus female_sans genderswap genderswap_(mtf) hand kneel legwear looking_at_hand looking_down meme meme_attire meme_clothing monster sans sans_(undertale) sequence sequential simple_background sitting skeleton solo_focus stockings surprised_expression sweater sympharin symphysins text thighs twitter undead undertale undertale_(series) video_game_character video_games virgin_killer_sweater white_background
1cuntboy animated_skeleton anon anonymous bed bedroom_eyes black_choker black_collar blue_blush blue_jacket blue_pussy blush bottom_sans bottomless choker claws clothed clothing collar creampiesummer cuntboy cuntboy_focus disembodied_hand ectoplasm ectopussy english_text fur furry half-closed_eyes hand imminent_sex jacket legs legs_apart legs_spread lying_on_back monster monster_boy on_back on_bed paw pussy pussy_juice sans sans_(undertale) skeleton smiling_at_viewer solo_focus talking_to_viewer text uke_sans undead undertale undertale_(series) unseen_character video_games wet_pussy
1cuntboy animated_skeleton anon anonymous bed bedroom_eyes black_choker black_collar blue_blush blue_jacket blue_pussy blush bottom_sans bottomless choker claws clothed clothing collar creampiesummer cuntboy cuntboy_focus disembodied_hand ectoplasm ectopussy english_text fur furry half-closed_eyes hand imminent_sex jacket legs legs_apart legs_spread lying_on_back monster monster_boy on_back on_bed paw pussy pussy_juice sans sans_(undertale) skeleton smiling_at_viewer solo_focus talking_to_viewer text uke_sans undead undertale undertale_(series) unseen_character video_games wet_pussy
1boy 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans digital_media_(artwork) disembodied_hand drooling ectotongue english_text hand heart-shaped_pupils heart_eyes humanoid male male_focus male_only malesub monochrome monster monster_boy open_mouth panting partially_colored sans sans_(undertale) simple_background singingsans skeleton solo_male submissive submissive_male text third-party_source tongue uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans digital_media_(artwork) disembodied_hand drooling ectotongue english_text hand heart-shaped_pupils heart_eyes humanoid male male_focus male_only malesub monochrome monster monster_boy open_mouth panting partially_colored sans sans_(undertale) simple_background singingsans skeleton solo_male submissive submissive_male text third-party_source tongue uke_sans undead undertale undertale_(series) video_game_character video_games
2010s 2017 2d 2d_(artwork) 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans bukkake clothed clothing cum cum_in_mouth cum_on_tongue digital_media_(artwork) ectotongue fangs finger_in_mouth fontcest gangbang gaster grillby grillsans hand implied_incest lowest-of-dirt lowest_of_dirt male male/male male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus papyrus_(undertale) papysans penis red_background sans sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus sex skeleton solo_focus tongue top_gaster top_grillby top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_game_character video_games yaoi
2010s 2017 2d 2d_(artwork) 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans bukkake clothed clothing cum cum_in_mouth cum_on_tongue digital_media_(artwork) ectotongue fangs finger_in_mouth fontcest gangbang gaster grillby grillsans hand implied_incest lowest-of-dirt lowest_of_dirt male male/male male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus papyrus_(undertale) papysans penis red_background sans sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus sex skeleton solo_focus tongue top_gaster top_grillby top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_game_character video_games yaoi
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
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton art_trade barefeet blush bondage bottom_sans bound bound_arms cheztnuts choking clothed digital_media_(artwork) disembodied_hand ectotongue grabbing_neck hand kneel male male_focus monster multiple_views rope rope_bondage sans sans_(undertale) shirt_pulled_up shirt_up skeleton solo solo_focus submissive sweat tied_up tongue tongue_out uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton art_trade barefeet blush bondage bottom_sans bound bound_arms cheztnuts choking clothed digital_media_(artwork) disembodied_hand ectotongue grabbing_neck hand kneel male male_focus monster multiple_views rope rope_bondage sans sans_(undertale) shirt_pulled_up shirt_up skeleton solo solo_focus submissive sweat tied_up tongue tongue_out uke_sans undead undertale undertale_(series) video_game_character video_games
1boy animated_skeleton artist_name blue_blush blush bottom_sans clothed deepthroat disembodied_hand dubnyangg english_text fellatio hand heart-shaped_pupils heart_eyes holding_popsicle male male_focus male_only moaning monster oral oral_sex popsicle popsicle_in_mouth popsicle_melting sans sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive tears text text_bubble throat_training uke_sans undead undertale undertale_(series) upper_body white_background
1boy animated_skeleton artist_name blue_blush blush bottom_sans clothed deepthroat disembodied_hand dubnyangg english_text fellatio hand heart-shaped_pupils heart_eyes holding_popsicle male male_focus male_only moaning monster oral oral_sex popsicle popsicle_in_mouth popsicle_melting sans sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive tears text text_bubble throat_training uke_sans undead undertale undertale_(series) upper_body white_background
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton blue_cum blue_hoodie blue_jacket blue_penis clothed cum cumshot digital_media_(artwork) ectopenis grabbing_leg grabbing_penis hand handjob hooded_jacket hoodie jacket ladybumtickler leg_grab male monster one_eye_closed penis sans sans_(undertale) sigh skeleton sniggysmut solo_focus solo_male undead undertale undertale_(series) video_game_character video_games white_background
1boy 2010s 2016 2d 2d_(artwork) animated_skeleton blue_cum blue_hoodie blue_jacket blue_penis clothed cum cumshot digital_media_(artwork) ectopenis grabbing_leg grabbing_penis hand handjob hooded_jacket hoodie jacket ladybumtickler leg_grab male monster one_eye_closed penis sans sans_(undertale) sigh skeleton sniggysmut solo_focus solo_male undead undertale undertale_(series) video_game_character video_games white_background
1:1 1:1_aspect_ratio 2010s 2017 animated_skeleton blush bottom_sans crying ectotongue hand korean_text monster peng2_(artist) peng2_undertale_(artist) sans sans_(undertale) skeleton solo_focus submissive tears text tongue uke_sans undead undertale undertale_(series) upper_body
1:1 1:1_aspect_ratio 2010s 2017 animated_skeleton blush bottom_sans crying ectotongue hand korean_text monster peng2_(artist) peng2_undertale_(artist) sans sans_(undertale) skeleton solo_focus submissive tears text tongue uke_sans undead undertale undertale_(series) upper_body
2d 2d_(artwork) animated_skeleton ass ass_up blue_blush blue_slippers blush bottom_sans cheztnuts clothed digital_media_(artwork) disembodied_hand hand kneel male male_focus malesub monster one_eye_closed pulling_pants sans sans_(undertale) skeleton slippers solo_focus submissive submissive_male top-down_bottom-up uke_sans undead undertale undertale_(series) video_games
2d 2d_(artwork) animated_skeleton ass ass_up blue_blush blue_slippers blush bottom_sans cheztnuts clothed digital_media_(artwork) disembodied_hand hand kneel male male_focus malesub monster one_eye_closed pulling_pants sans sans_(undertale) skeleton slippers solo_focus submissive submissive_male top-down_bottom-up uke_sans undead undertale undertale_(series) video_games
2020s 2023 2d 2d_(artwork) animated_skeleton arms_behind_back blue_eyes bodily_fluids bondage bottom_sans bound_arms bound_wrists completely_nude crying crying_with_eyes_open edit edited egg_vibrator english_text fluids gagfan3 grey_background hand hands_behind_back humanoid implied_incest intraspecies kneel kneeling male monochrome monster monster_boy naked nude onomatopoeia partially_colored sans sans_(undertale) sex_toy simple_background skeleton solid_color_background solo_focus soul soul_sex sweat taped_mouth tears text third-party_edit thought_bubble tied_arms tied_up tired_but_horny_(artist) twitter uke_sans undead undertale undertale_(series) unseen_character vibrator video_game_character video_games yaoi
2020s 2023 2d 2d_(artwork) animated_skeleton arms_behind_back blue_eyes bodily_fluids bondage bottom_sans bound_arms bound_wrists completely_nude crying crying_with_eyes_open edit edited egg_vibrator english_text fluids gagfan3 grey_background hand hands_behind_back humanoid implied_incest intraspecies kneel kneeling male monochrome monster monster_boy naked nude onomatopoeia partially_colored sans sans_(undertale) sex_toy simple_background skeleton solid_color_background solo_focus soul soul_sex sweat taped_mouth tears text third-party_edit thought_bubble tied_arms tied_up tired_but_horny_(artist) twitter uke_sans undead undertale undertale_(series) unseen_character vibrator video_game_character video_games yaoi
2020s 2023 2d 2d_(artwork) animated_skeleton arms_behind_back bondage bottom_sans bound_arms bound_wrists completely_nude crying crying_with_eyes_open egg_vibrator english_text grey_background hand hands_behind_back humanoid implied_incest intraspecies kneel kneeling male monochrome monster monster_boy naked nude onomatopoeia sans sans_(undertale) sex_toy simple_background skeleton solo_focus soul soul_sex sweat tears text thought_bubble tied_arms tied_up tired_but_horny_(artist) twitter uke_sans undead undertale undertale_(series) unseen_character vibrator video_game_character video_games yaoi
2020s 2023 2d 2d_(artwork) animated_skeleton arms_behind_back bondage bottom_sans bound_arms bound_wrists completely_nude crying crying_with_eyes_open egg_vibrator english_text grey_background hand hands_behind_back humanoid implied_incest intraspecies kneel kneeling male monochrome monster monster_boy naked nude onomatopoeia sans sans_(undertale) sex_toy simple_background skeleton solo_focus soul soul_sex sweat tears text thought_bubble tied_arms tied_up tired_but_horny_(artist) twitter uke_sans undead undertale undertale_(series) unseen_character vibrator video_game_character video_games yaoi
2010s 2018 2boys animated_skeleton blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed duo fontcest fontgalore grabbing_face grey_background hand incest male male_only monster one_eye_closed out_of_frame pancakepants papyrus papyrus_(undertale) papysans saliva saliva_on_finger saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus skeleton solid_color_background solo_focus submissive tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body yaoi
2010s 2018 2boys animated_skeleton blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed duo fontcest fontgalore grabbing_face grey_background hand incest male male_only monster one_eye_closed out_of_frame pancakepants papyrus papyrus_(undertale) papysans saliva saliva_on_finger saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus skeleton solid_color_background solo_focus submissive tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body yaoi
2015 2d 2d_(artwork) animated_skeleton black_background blue_blush blush bottom_sans clothed duo gaster gaster_(undertale) groping hand hand_on_crotch hands male monster multiple_hands sans sans_(undertale) sanster seme_gaster shirt_up skeleton solo_focus suckmytrombone sweater top_gaster uke_sans undead undertale undertale_(series) video_games
2015 2d 2d_(artwork) animated_skeleton black_background blue_blush blush bottom_sans clothed duo gaster gaster_(undertale) groping hand hand_on_crotch hands male monster multiple_hands sans sans_(undertale) sanster seme_gaster shirt_up skeleton solo_focus suckmytrombone sweater top_gaster uke_sans undead undertale undertale_(series) video_games
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) adorable animated_skeleton artist_name blue_blush blue_hoodie blue_jacket blush bottom_sans clothed cute cute_male digital_media_(artwork) doiduh dominant_pov from_above hand hooded_jacket hoodie humanoid jacket kabedon looking_at_viewer male male_focus monster monster_boy pink_slippers pov sans sans_(undertale) skeleton slippers smaller_male solo_focus submissive submissive_male surprised surprised_expression sweat uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure)
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) adorable animated_skeleton artist_name blue_blush blue_hoodie blue_jacket blush bottom_sans clothed cute cute_male digital_media_(artwork) doiduh dominant_pov from_above hand hooded_jacket hoodie humanoid jacket kabedon looking_at_viewer male male_focus monster monster_boy pink_slippers pov sans sans_(undertale) skeleton slippers smaller_male solo_focus submissive submissive_male surprised surprised_expression sweat uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure)
1boy 2016 2d 2d_(artwork) animated_skeleton blue_blush blue_jacket blue_tongue blush clothed dark_background digital_media_(artwork) disembodied_hand grabbing_mouth hand jacket male male_focus monster mouth_held_open one_eye_closed sans sans_(undertale) simple_background skeleton solid_color_background solo_focus tears tinyskeletonfucker tongue tumblr tumblr_username undead undertale undertale_(series) upper_body video_game_character video_games
1boy 2016 2d 2d_(artwork) animated_skeleton blue_blush blue_jacket blue_tongue blush clothed dark_background digital_media_(artwork) disembodied_hand grabbing_mouth hand jacket male male_focus monster mouth_held_open one_eye_closed sans sans_(undertale) simple_background skeleton solid_color_background solo_focus tears tinyskeletonfucker tongue tumblr tumblr_username undead undertale undertale_(series) upper_body video_game_character video_games
animated_skeleton artist_request black_and_white blush disembodied_hand drooling formal_clothes formal_wear groping hand legs_apart looking_down moaning monochrome monster sans sans_(undertale) sitting skeleton solo_focus sweat text touching_crotch unbuckled_belt undead undertale undertale_(series) unzipped unzipped_pants
animated_skeleton artist_request black_and_white blush disembodied_hand drooling formal_clothes formal_wear groping hand legs_apart looking_down moaning monochrome monster sans sans_(undertale) sitting skeleton solo_focus sweat text touching_crotch unbuckled_belt undead undertale undertale_(series) unzipped unzipped_pants
animated_skeleton artist_request blue_blush blue_tongue blush bottom_sans disembodied_hand food hand hooded_jacket hoodie hot_dog hotdog jacket monster off_shoulder off_shoulders one_eye_closed sans sans_(undertale) skeleton solo_focus suggestive suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
animated_skeleton artist_request blue_blush blue_tongue blush bottom_sans disembodied_hand food hand hooded_jacket hoodie hot_dog hotdog jacket monster off_shoulder off_shoulders one_eye_closed sans sans_(undertale) skeleton solo_focus suggestive suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
animated_skeleton artist_request blue_blush blue_jacket blue_tongue blush bottom_sans disembodied_hand grabbing_own_leg groping hand jacket looking_down monster nude off_shoulder off_shoulders sans sans_(undertale) skeleton solo_focus submissive tongue tongue_out touching_crotch uke_sans undead undertale undertale_(series) white_background
animated_skeleton artist_request blue_blush blue_jacket blue_tongue blush bottom_sans disembodied_hand grabbing_own_leg groping hand jacket looking_down monster nude off_shoulder off_shoulders sans sans_(undertale) skeleton solo_focus submissive tongue tongue_out touching_crotch uke_sans undead undertale undertale_(series) white_background
1boy 2020s 2022 ambiguous_fluids animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed fluids hand hooded_jacket hoodie jacket male_focus monster pixiv_id_7835302 popsicle sans sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_fluid suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
1boy 2020s 2022 ambiguous_fluids animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed fluids hand hooded_jacket hoodie jacket male_focus monster pixiv_id_7835302 popsicle sans sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_fluid suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
2010s 2018 animated_skeleton ass_slap ass_spanking bottom_sans butt_slap butt_spanking completely_naked completely_nude crying gaster gaster_(undertale) grabbing_sheets gripping_sheets hand monster nude pf-pro-fucker pf_pro_fucker sans sans_(undertale) skeleton slapping slapping_butt solo_focus spanking spanking_ass spanking_butt tears trembling uke_sans undead undertale undertale_(series) unseen_character
2010s 2018 animated_skeleton ass_slap ass_spanking bottom_sans butt_slap butt_spanking completely_naked completely_nude crying gaster gaster_(undertale) grabbing_sheets gripping_sheets hand monster nude pf-pro-fucker pf_pro_fucker sans sans_(undertale) skeleton slapping slapping_butt solo_focus spanking spanking_ass spanking_butt tears trembling uke_sans undead undertale undertale_(series) unseen_character
2020s 2022 2d 2d_(artwork) animated_skeleton arm_grab bad_id bad_twitter_id black_and_white bottom_sans clothed covering_mouth digital_media_(artwork) fingering fingering_another fingering_partner gaster gaster_(undertale) grabbing_arm grabbing_hand hand hand_grab hand_on_mouth hands inactive_account male male_focus male_only monochrome monster monster_boy multiple_hands non-con non-consensual noncon nonconsensual pants_pull pants_pulled_down sans sans_(undertale) sanster seme_gaster shirt_lift shirt_pull shirt_up simple_background skeleton socks_on solo_focus top_gaster toubigaizi twitter uke_sans undead undertale undertale_(series) undressing unseen_character unseen_male_face video_game_character video_games white_hair yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton arm_grab bad_id bad_twitter_id black_and_white bottom_sans clothed covering_mouth digital_media_(artwork) fingering fingering_another fingering_partner gaster gaster_(undertale) grabbing_arm grabbing_hand hand hand_grab hand_on_mouth hands inactive_account male male_focus male_only monochrome monster monster_boy multiple_hands non-con non-consensual noncon nonconsensual pants_pull pants_pulled_down sans sans_(undertale) sanster seme_gaster shirt_lift shirt_pull shirt_up simple_background skeleton socks_on solo_focus top_gaster toubigaizi twitter uke_sans undead undertale undertale_(series) undressing unseen_character unseen_male_face video_game_character video_games white_hair yaoi
2017 2d 2d_(artwork) ? alcohol alcoholic_beverage alcoholic_drink animal_paws animated_skeleton ass bottle claws clueless digital_media_(artwork) drunk group hand hand_on_crotch hands humanoid imminent_gangbang imminent_rape imminent_sex intoxicated liquor male male/male male_focus monochrome monster monster_boy nczhhdyb oblivious paws sans sans_(undertale) shirt_up skeleton snapchat solo_focus soul spoken_question_mark stwdyb text tumblr undead undertale undertale_(series) unseen_character unseen_male_face video_game_character video_games vines vines_tentacles
2017 2d 2d_(artwork) ? alcohol alcoholic_beverage alcoholic_drink animal_paws animated_skeleton ass bottle claws clueless digital_media_(artwork) drunk group hand hand_on_crotch hands humanoid imminent_gangbang imminent_rape imminent_sex intoxicated liquor male male/male male_focus monochrome monster monster_boy nczhhdyb oblivious paws sans sans_(undertale) shirt_up skeleton snapchat solo_focus soul spoken_question_mark stwdyb text tumblr undead undertale undertale_(series) unseen_character unseen_male_face video_game_character video_games vines vines_tentacles
1boy 2d 2d_(artwork) animated_skeleton anon anonymous bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male digital_media_(artwork) disembodied_hand ectopenis erect_penis genital_fluids genitals hand heart-shaped_pupils heart_eyes humanoid legs_apart m_legs macrophilia male male_focus malesub micro micro_male microphilia monster monster_boy nude nude_male one_eye_closed penis precum purple_background sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male solid_color_background solo_focus solo_male spoken_heart spread_legs submissive submissive_male undead undertale undertale_(series) video_game_character video_games
1boy 2d 2d_(artwork) animated_skeleton anon anonymous bittersweetdeath blue_blush blue_penis blush completely_nude completely_nude_male digital_media_(artwork) disembodied_hand ectopenis erect_penis genital_fluids genitals hand heart-shaped_pupils heart_eyes humanoid legs_apart m_legs macrophilia male male_focus malesub micro micro_male microphilia monster monster_boy nude nude_male one_eye_closed penis precum purple_background sans sans_(undertale) simple_background size_difference skeleton small_penis smaller_male solid_color_background solo_focus solo_male spoken_heart spread_legs submissive submissive_male undead undertale undertale_(series) video_game_character video_games
1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed cum_on_face cum_on_self cuntboy disembodied_hand ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) looking_down monster monster_boy object_insertion partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tongue tongue_out uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy
1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed cum_on_face cum_on_self cuntboy disembodied_hand ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) looking_down monster monster_boy object_insertion partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tongue tongue_out uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy
1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_cum blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed crying cum cuntboy disembodied_hand drooling ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) monster monster_boy object_insertion one_eye_closed orgasm partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tears uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy
1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_cum blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed crying cum cuntboy disembodied_hand drooling ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) monster monster_boy object_insertion one_eye_closed orgasm partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tears uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy