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1:1 1:1_aspect_ratio 2020 animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub crying crying_with_eyes_open darkner deltarune king_spade male monster naked non-con non-consensual noncon nonconsensual nude rape sans sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins tears undead undertale undertale_(series) unseen_male_face yaoi
1:1 1:1_aspect_ratio 2020 animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub crying crying_with_eyes_open darkner deltarune king_spade male monster naked non-con non-consensual noncon nonconsensual nude rape sans sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins tears undead undertale undertale_(series) unseen_male_face yaoi
2020 animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed darkner deltarune imminent_rape king_spade male monster non-con non-consensual noncon nonconsensual sans sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins undead undertale undertale_(series)
2020 animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub clothed darkner deltarune imminent_rape king_spade male monster non-con non-consensual noncon nonconsensual sans sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins undead undertale undertale_(series)
aftertale alternate_universe error_sans error_sans_(fan_character) errortale geno_sans ink_sans ink_sans_(fan_character) inktale reaper_sans reapertale sans sans_au sanscest selfcest sympharin symphysins tagme tied_up undertale_au
aftertale alternate_universe error_sans error_sans_(fan_character) errortale geno_sans ink_sans ink_sans_(fan_character) inktale reaper_sans reapertale sans sans_au sanscest selfcest sympharin symphysins tagme tied_up undertale_au
alternate_universe bite_mark biting blush brothers dust_papyrus dust_sans dusttale dusttale_sans gay headpat implied_incest incest kneeling male male_only overstimulated overstimulation panting papyrus papyrus_(dusttale) papyrus_au petting presenting sans sans_(dusttale) sans_au shaky sitting soul_sex sympharin symphysins undertale_au
alternate_universe bite_mark biting blush brothers dust_papyrus dust_sans dusttale dusttale_sans gay headpat implied_incest incest kneeling male male_only overstimulated overstimulation panting papyrus papyrus_(dusttale) papyrus_au petting presenting sans sans_(dusttale) sans_au shaky sitting soul_sex sympharin symphysins undertale_au
2boys ? ?!?! alternate_universe animated_skeleton begging blush disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale dusttale_sans face_in_chest fingers_interlocked fingers_intertwined flushed flushed_face flustered gay glove gloves grope holding_hands holding_wrists hood hood_up hooded_jacket hoodie incest interlocked_fingers intertwined_fingers kissing_chest male papyrus papyrus_(dusttale) papyrus_au pleading purple_blush sans sans_(dusttale) sans_au scarf shaking shivering skeleton soul soul_sex soul_steal soul_stealing spoken_heart spoken_musical_note spoken_question_mark surprised sweat sweatdrop sympharin symphysins undertale_au weak_resistance
2boys ? ?!?! alternate_universe animated_skeleton begging blush disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale dusttale_sans face_in_chest fingers_interlocked fingers_intertwined flushed flushed_face flustered gay glove gloves grope holding_hands holding_wrists hood hood_up hooded_jacket hoodie incest interlocked_fingers intertwined_fingers kissing_chest male papyrus papyrus_(dusttale) papyrus_au pleading purple_blush sans sans_(dusttale) sans_au scarf shaking shivering skeleton soul soul_sex soul_steal soul_stealing spoken_heart spoken_musical_note spoken_question_mark surprised sweat sweatdrop sympharin symphysins undertale_au weak_resistance
alternate_universe animated_skeleton bite_mark biting blush brothers dust_papyrus dust_sans dusttale dusttale_sans gay headpat incest kneeling male male_only overstimulated overstimulation panting papyrus papyrus_(dusttale) papyrus_au petting presenting sans sans_(dusttale) sans_au shaky sitting skeleton soul_sex sympharin symphysins undertale_au
alternate_universe animated_skeleton bite_mark biting blush brothers dust_papyrus dust_sans dusttale dusttale_sans gay headpat incest kneeling male male_only overstimulated overstimulation panting papyrus papyrus_(dusttale) papyrus_au petting presenting sans sans_(dusttale) sans_au shaky sitting skeleton soul_sex sympharin symphysins undertale_au
2d alternate_universe animated_skeleton dripping error_sans_(fan_character) errortale gay hands reaper_sans reapertale sans sans_au sanscest shaky skeleton soul soul_sex sympharin symphysins undertale undertale_(series) undertale_au
2d alternate_universe animated_skeleton dripping error_sans_(fan_character) errortale gay hands reaper_sans reapertale sans sans_au sanscest shaky skeleton soul soul_sex sympharin symphysins undertale undertale_(series) undertale_au
2boys balancing bondage dlido dominant dripping_precum drool drool_on_face error_sans_(fan_character) errortale gay hands_between_legs holding_on kinbaku legs_tied legs_tied_together male malesub moaning overstimulated overstimulation papyrus papyrus_au reaper_sans reapertale sans sans_au sanscest selfcest soul_sex submissive_male sympharin1 symphysins tears tears_of_pleasure teasing tied_legs undertale_au
2boys balancing bondage dlido dominant dripping_precum drool drool_on_face error_sans_(fan_character) errortale gay hands_between_legs holding_on kinbaku legs_tied legs_tied_together male malesub moaning overstimulated overstimulation papyrus papyrus_au reaper_sans reapertale sans sans_au sanscest selfcest soul_sex submissive_male sympharin1 symphysins tears tears_of_pleasure teasing tied_legs undertale_au
2d 4boys 5boys 6boys alternate_universe animated_skeleton anthro black_and_white cross_sans cross_sans_(fan_character) dream_sans dream_sans_(fan_character) dreamtale dreamtale_(undertale_fanfiction) dreamtale_au dust_sans dusttale dusttale_sans encouragement english_text horror_sans horrortale horrortale_sans humanoid killer_sans killertale moaning moaning_in_pleasure moaning_loud monochrome murder_time_trio nightmare_sans recording recording_on_phone sans sans_au sanscest skeleton sympharin symphysins tentacle text undertale_(series) undertale_au voyeur voyeurism xtale
2d 4boys 5boys 6boys alternate_universe animated_skeleton anthro black_and_white cross_sans cross_sans_(fan_character) dream_sans dream_sans_(fan_character) dreamtale dreamtale_(undertale_fanfiction) dreamtale_au dust_sans dusttale dusttale_sans encouragement english_text horror_sans horrortale horrortale_sans humanoid killer_sans killertale moaning moaning_in_pleasure moaning_loud monochrome murder_time_trio nightmare_sans recording recording_on_phone sans sans_au sanscest skeleton sympharin symphysins tentacle text undertale_(series) undertale_au voyeur voyeurism xtale
1boy 2boys 2d alternate_universe animated_skeleton anthro biting_shirt blush clothes_falling_off cross_sans cross_sans_(fan_character) dream_sans dream_sans_(fan_character) dreamtale dreamtale_(undertale_fanfiction) dreamtale_au ectobody ectopenis exposed_penis exposed_pussy flexibility flexible gay holding_ass holding_leg holding_legs_back holding_shirt_with_mouth humanoid knife midriff ripped_clothing ripped_leggings ripped_pants sans sans_au sanscest shaky_legs skeleton stretching sympharin symphysins undertale_(series) undertale_au xtale
1boy 2boys 2d alternate_universe animated_skeleton anthro biting_shirt blush clothes_falling_off cross_sans cross_sans_(fan_character) dream_sans dream_sans_(fan_character) dreamtale dreamtale_(undertale_fanfiction) dreamtale_au ectobody ectopenis exposed_penis exposed_pussy flexibility flexible gay holding_ass holding_leg holding_legs_back holding_shirt_with_mouth humanoid knife midriff ripped_clothing ripped_leggings ripped_pants sans sans_au sanscest shaky_legs skeleton stretching sympharin symphysins undertale_(series) undertale_au xtale
2d 4boys aftertale alternate_universe animated_skeleton arms_behind_back blue_blush bondage bound_together coffee_cup coffee_mug collar connected_collars dominant_male drool drool_string drooling duo error_sans error_sans_(fan_character) errortale excited expressive_clothes expressive_object gay geno_sans heart-shaped_pupils humanoid in_lap ink_sans ink_sans_(fan_character) inktale kissing linked_collar looming looming_over male malesub multiple_boys multiple_subs nervous polyamory popcorn question_mark_eyes rainbow_blush raised_brow reaper_sans reapertale rope sans sans_au sanscest selfcest shadows sitting_on_penis skeleton smug spit_trail submissive_male surprised sweatdrop sympharin symphysins tied_arms tied_arms_behind_back tied_legs tied_up tied_wrists two_subs_two_doms undertale undertale_(series) undertale_au voyeurism wide_eyed yaoi
2d 4boys aftertale alternate_universe animated_skeleton arms_behind_back blue_blush bondage bound_together coffee_cup coffee_mug collar connected_collars dominant_male drool drool_string drooling duo error_sans error_sans_(fan_character) errortale excited expressive_clothes expressive_object gay geno_sans heart-shaped_pupils humanoid in_lap ink_sans ink_sans_(fan_character) inktale kissing linked_collar looming looming_over male malesub multiple_boys multiple_subs nervous polyamory popcorn question_mark_eyes rainbow_blush raised_brow reaper_sans reapertale rope sans sans_au sanscest selfcest shadows sitting_on_penis skeleton smug spit_trail submissive_male surprised sweatdrop sympharin symphysins tied_arms tied_arms_behind_back tied_legs tied_up tied_wrists two_subs_two_doms undertale undertale_(series) undertale_au voyeurism wide_eyed yaoi
1boy 1girls 2d anthro blush bondage clothed clothed_female dominant_female drool drooling drooling_tongue female female_anthro femdom flowers furry humanoid male malesub naked nervous nude nude_male plant_bondage reaper_sans reapertale sans sans_au smaller_male straight submissive_male sympharin1 symphysins tied_up toriel toriel_(reapertale) undertale undertale_(series) undertale_au vine_bondage
1boy 1girls 2d anthro blush bondage clothed clothed_female dominant_female drool drooling drooling_tongue female female_anthro femdom flowers furry humanoid male malesub naked nervous nude nude_male plant_bondage reaper_sans reapertale sans sans_au smaller_male straight submissive_male sympharin1 symphysins tied_up toriel toriel_(reapertale) undertale undertale_(series) undertale_au vine_bondage
2boys big_sub big_sub_small_dom big_sub_small_top bigger_sub blue_eyes covering_face daydream daydreaming dreaming embarrassed english_text flexibility flexible funny gay gay_domination gay_sex hiding_face holding_leg holding_leg_up holding_legs holding_legs_up imagining incest larger_penetrated male papyrus papyrus_au sans sans_(underswap) sans_au smaller_dom smaller_dom_larger_sub smaller_dominant smaller_penetrating splits sympharin symphysins text thinking_about_sex underswap underswap_papyrus underswap_sans undertale_au
2boys big_sub big_sub_small_dom big_sub_small_top bigger_sub blue_eyes covering_face daydream daydreaming dreaming embarrassed english_text flexibility flexible funny gay gay_domination gay_sex hiding_face holding_leg holding_leg_up holding_legs holding_legs_up imagining incest larger_penetrated male papyrus papyrus_au sans sans_(underswap) sans_au smaller_dom smaller_dom_larger_sub smaller_dominant smaller_penetrating splits sympharin symphysins text thinking_about_sex underswap underswap_papyrus underswap_sans undertale_au
blue_blush blush cum cum_in_mouth dream dreaming gay groping incest kabedon male male/male male_only orange_cum orange_tentacles papyrus penetration pinned_against_wall sans shirt_lift sympharin symphysins tentacle tentacle_sex tentacles undertale wet_dream
blue_blush blush cum cum_in_mouth dream dreaming gay groping incest kabedon male male/male male_only orange_cum orange_tentacles papyrus penetration pinned_against_wall sans shirt_lift sympharin symphysins tentacle tentacle_sex tentacles undertale wet_dream
2boys 2d alternate_universe animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush crying crying_with_eyes_open deep_penetration drool drool_on_face drooling english_text gay hands_on_chest hands_on_hips hands_on_thighs huge_cock humanoid incest larger_penetrating larger_penetrating_smaller leaning_back lube lube_on_penis male nervous papyrus_(underfell) papyrus_au penis red_penis rough_sex sans sex sitting_on_lap sitting_on_penis size_difference size_play size_queen skeleton small_sub_big_dom smaller_male smaller_penetrated smug spiked_penis sweat sweatdrop sympharin symphysins talking teary_eyes tentacle_penis text underfell underfell_papyrus undertale_(series) undertale_au
2boys 2d alternate_universe animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush crying crying_with_eyes_open deep_penetration drool drool_on_face drooling english_text gay hands_on_chest hands_on_hips hands_on_thighs huge_cock humanoid incest larger_penetrating larger_penetrating_smaller leaning_back lube lube_on_penis male nervous papyrus_(underfell) papyrus_au penis red_penis rough_sex sans sex sitting_on_lap sitting_on_penis size_difference size_play size_queen skeleton small_sub_big_dom smaller_male smaller_penetrated smug spiked_penis sweat sweatdrop sympharin symphysins talking teary_eyes tentacle_penis text underfell underfell_papyrus undertale_(series) undertale_au
2boys alternate_universe animated_skeleton disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale english_text exposed exposed_midriff exposed_pussy fingering gay ghost glove gloves gripping grope groping groping_chest groping_from_behind hidden hood hood_up hooded_jacket hoodie in_public incest lifting_shirt male midriff papyrus papyrus_au purple_blush sans sans_au scarf shaking shivering shorts skeleton soul_sex spread_legs sweatdrop sympharin symphysins teary_eyes text trying_to_be_quiet turtleneck under_the_table undertale_au unknowing_bystander yandere
2boys alternate_universe animated_skeleton disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale english_text exposed exposed_midriff exposed_pussy fingering gay ghost glove gloves gripping grope groping groping_chest groping_from_behind hidden hood hood_up hooded_jacket hoodie in_public incest lifting_shirt male midriff papyrus papyrus_au purple_blush sans sans_au scarf shaking shivering shorts skeleton soul_sex spread_legs sweatdrop sympharin symphysins teary_eyes text trying_to_be_quiet turtleneck under_the_table undertale_au unknowing_bystander yandere
1boy 2d alternate_universe animated_skeleton anklehighs bow exposed_back exposed_shoulders humanoid killer_sans killertale open_back sans sans_au skeleton small_tail socks solo sticking_ass_out sympharin symphysins tagme tail tiny_tail turn_cuff_socks undertale_(series) undertale_au virgin_killer_sweater white_socks wink winking winking_at_viewer
1boy 2d alternate_universe animated_skeleton anklehighs bow exposed_back exposed_shoulders humanoid killer_sans killertale open_back sans sans_au skeleton small_tail socks solo sticking_ass_out sympharin symphysins tagme tail tiny_tail turn_cuff_socks undertale_(series) undertale_au virgin_killer_sweater white_socks wink winking winking_at_viewer
2boys alternate_universe animated_skeleton begging blush disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale face_in_chest flushed flushed_face flustered gay glove gloves grope holding_hands holding_wrists hood hood_up hooded_jacket hoodie incest kissing_chest male papyrus papyrus_(dusttale) papyrus_au pleading purple_blush sans sans_(dusttale) sans_au scarf shaking shivering skeleton soul_sex soul_steal soul_stealing surprised sweat sweatdrop sympharin symphysins undertale undertale_au weak_resistance yandere yandere_papyrus
2boys alternate_universe animated_skeleton begging blush disembodied_hand disembodied_hands disembodied_head dust_papyrus dust_sans dusttale face_in_chest flushed flushed_face flustered gay glove gloves grope holding_hands holding_wrists hood hood_up hooded_jacket hoodie incest kissing_chest male papyrus papyrus_(dusttale) papyrus_au pleading purple_blush sans sans_(dusttale) sans_au scarf shaking shivering skeleton soul_sex soul_steal soul_stealing surprised sweat sweatdrop sympharin symphysins undertale undertale_au weak_resistance yandere yandere_papyrus
2010s 2018 2boys after_fellatio after_oral angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth dominant dominant_male duo ectopenis edit edited english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket kneel larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sympharin symphysins talking_to_another tears text third-party_edit top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2018 2boys after_fellatio after_oral angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth dominant dominant_male duo ectopenis edit edited english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket kneel larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sympharin symphysins talking_to_another tears text third-party_edit top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2018 2boys after_fellatio after_oral angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth dominant dominant_male duo ectopenis edit edited english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket kneel larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sympharin symphysins talking_to_another tears text third-party_edit top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2018 2boys after_fellatio after_oral angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth dominant dominant_male duo ectopenis edit edited english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket kneel larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sympharin symphysins talking_to_another tears text third-party_edit top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2boys after_fellatio after_oral animated_skeleton black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth duo english_text fontcest hoodie incest intraspecies jacket kneeling male male/male male_only maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch solo_focus submissive submissive_male sympharin symphysins talking_to_another text top_papyrus uke_sans undead undertale undertale_(series) unseen_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2boys after_fellatio after_oral animated_skeleton black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing cum_in_mouth duo english_text fontcest hoodie incest intraspecies jacket kneeling male male/male male_only maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch solo_focus submissive submissive_male sympharin symphysins talking_to_another text top_papyrus uke_sans undead undertale undertale_(series) unseen_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2boys angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing dominant dominant_male duo ectopenis english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male sympharin symphysins talking_to_another tears text top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2boys angry animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white bottom_sans brother brother/brother brother_and_brother brothers clothed clothing dominant dominant_male duo ectopenis english_text fontcest forced_fellatio forced_oral gloves head_wings hoodie incest intraspecies irrumatio jacket larger_male male male/male male_only male_pov maledom malesub monochrome monster monster_boy papyrus papyrus_(undertale) papysans penis penis_in_mouth pov sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male sympharin symphysins talking_to_another tears text top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
!! 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
1:1 1:1_aspect_ratio 2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans crying crying_with_eyes_open darkner deltarune deltarune_chapter_1 duo gay king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual nude nude_male sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus stomach_mouth sympharin symphysins tears uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans crying crying_with_eyes_open darkner deltarune deltarune_chapter_1 duo gay king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual nude nude_male sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus stomach_mouth sympharin symphysins tears uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed darkner deltarune deltarune_chapter_1 duo gay imminent_rape king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed darkner deltarune deltarune_chapter_1 duo gay imminent_rape king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2019 2d 2d_(artwork) animated_skeleton blanket blue_blush blush bottom_sans brother brother_and_brother brothers cum cum_in_mouth digital_media_(artwork) dream dreaming duo fontcest groping incest intraspecies male monster monster_boy nightcap orange_cum orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pillow pinned sans sans_(undertale) seme_papyrus shirt_lift sibling_incest siblings simple_background skeleton sympharin symphysins tentacle tentacle_sex top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games wet_dream white_background yaoi
1:1 1:1_aspect_ratio 2010s 2019 2d 2d_(artwork) animated_skeleton blanket blue_blush blush bottom_sans brother brother_and_brother brothers cum cum_in_mouth digital_media_(artwork) dream dreaming duo fontcest groping incest intraspecies male monster monster_boy nightcap orange_cum orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pillow pinned sans sans_(undertale) seme_papyrus shirt_lift sibling_incest siblings simple_background skeleton sympharin symphysins tentacle tentacle_sex top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games wet_dream white_background yaoi