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1boy 1boy1girl 1girl 2024 2d 2d_(artwork) all_fours alternate_version_available amalgamate_(undertale) animal_genitalia animal_penis artist_name ass ass_up balls beastiality big_ass big_balls big_belly big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_penis blue_topwear blush bottom_heavy bottomless bottomless_female breasts brown_hair calves canid canine canine_penis canis claws clenched_teeth closed_eyes clothed clothed_female clothes clothing cum cum_in_pussy cum_inside cum_pool cumflated_belly cumflation digital_media_(artwork) doggy_position dominant dominant_feral dominant_male drooling duo endogeny english_text excessive_cum female_frisk female_human female_penetrated femsub feral feral_on_female feral_on_human feral_penetrating feral_penetrating_human fluffy_ears fluffy_tail footwear frisk frisk_(undertale) from_behind_position front_view furry_balls genital_fluids genitals hetero holding_head huge_penis human impregnation indoors inflation interspecies interspecies_impregnation kneel knot large_ass large_balls large_penis larger_feral larger_male larger_penetrating larger_penetrating_smaller legs_apart light-skinned_female light_skin male male/female male_feral/female_human male_penetrating male_penetrating_female maledom medium_hair monster multi_leg multi_limb on_floor open_mouth ovum partially_clothed paw_on_head paws penetration penis penis_in_pussy pussy_juice pussy_juice_string raised_leg sequence sequential sex sex_from_behind shirt shoes signature size_difference small_sub small_sub_big_dom smaller_female smaller_human smaller_penetrated smaller_sub smaller_sub_bigger_dom sperm_cell straight striped_clothing submissive submissive_female submissive_human sweater sydneysnack tail teeth testicle text thick_thighs thighs tongue topwear trembling undertale undertale_(series) vaginal vaginal_juices vaginal_penetration vaginal_sex video_game_character video_games white_body white_fur wide_hips zoophilia
1boy 1boy1girl 1girl 2024 2d 2d_(artwork) all_fours alternate_version_available amalgamate_(undertale) animal_genitalia animal_penis artist_name ass ass_up balls beastiality big_ass big_balls big_belly big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_penis blue_topwear blush bottom_heavy bottomless bottomless_female breasts brown_hair calves canid canine canine_penis canis claws clenched_teeth closed_eyes clothed clothed_female clothes clothing cum cum_in_pussy cum_inside cum_pool cumflated_belly cumflation digital_media_(artwork) doggy_position dominant dominant_feral dominant_male drooling duo endogeny english_text excessive_cum female_frisk female_human female_penetrated femsub feral feral_on_female feral_on_human feral_penetrating feral_penetrating_human fluffy_ears fluffy_tail footwear frisk frisk_(undertale) from_behind_position front_view furry_balls genital_fluids genitals hetero holding_head huge_penis human impregnation indoors inflation interspecies interspecies_impregnation kneel knot large_ass large_balls large_penis larger_feral larger_male larger_penetrating larger_penetrating_smaller legs_apart light-skinned_female light_skin male male/female male_feral/female_human male_penetrating male_penetrating_female maledom medium_hair monster multi_leg multi_limb on_floor open_mouth ovum partially_clothed paw_on_head paws penetration penis penis_in_pussy pussy_juice pussy_juice_string raised_leg sequence sequential sex sex_from_behind shirt shoes signature size_difference small_sub small_sub_big_dom smaller_female smaller_human smaller_penetrated smaller_sub smaller_sub_bigger_dom sperm_cell straight striped_clothing submissive submissive_female submissive_human sweater sydneysnack tail teeth testicle text thick_thighs thighs tongue topwear trembling undertale undertale_(series) vaginal vaginal_juices vaginal_penetration vaginal_sex video_game_character video_games white_body white_fur wide_hips zoophilia
1boy 1boy1girl 1girl 2024 2d 2d_(artwork) all_fours alternate_version_available amalgamate_(undertale) animal_genitalia animal_penis artist_name ass ass_up balls beastiality big_ass big_balls big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_penis blue_topwear blush bottom_heavy bottomless bottomless_female breasts brown_hair calves canid canine canine_penis canis claws closed_eyes clothed clothed_female clothes clothing digital_media_(artwork) doggy_position dominant dominant_feral dominant_male drooling duo endogeny english_text female_frisk female_human female_penetrated femsub feral feral_on_female feral_on_human feral_penetrating feral_penetrating_human fluffy_ears fluffy_tail footwear frisk frisk_(undertale) from_behind_position front_view fur furry_balls genital_fluids genitals hair hetero holding_head huge_penis human indoors interspecies kneel knot large_ass large_balls large_penis larger_feral larger_male larger_penetrating larger_penetrating_smaller legs_apart light-skinned_female light_skin male male/female male_feral/female_human male_penetrating male_penetrating_female maledom medium_hair monster multi_leg multi_limb on_floor open_mouth partially_clothed paw paw_on_head paws penetration penis penis_in_pussy pussy_juice pussy_juice_string raised_leg sequence sequential sex sex_from_behind shirt shoes signature size_difference small_sub small_sub_big_dom smaller_female smaller_human smaller_penetrated smaller_sub smaller_sub_bigger_dom straight striped_clothing submissive submissive_female submissive_human sweater sydneysnack tail teeth testicle text thick_thighs thighs tongue top-down_bottom-up topwear trembling undertale undertale_(series) vaginal vaginal_juices vaginal_penetration vaginal_sex video_game_character video_games white_body white_fur wide_hips zoophilia
1boy 1boy1girl 1girl 2024 2d 2d_(artwork) all_fours alternate_version_available amalgamate_(undertale) animal_genitalia animal_penis artist_name ass ass_up balls beastiality big_ass big_balls big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_penis blue_topwear blush bottom_heavy bottomless bottomless_female breasts brown_hair calves canid canine canine_penis canis claws closed_eyes clothed clothed_female clothes clothing digital_media_(artwork) doggy_position dominant dominant_feral dominant_male drooling duo endogeny english_text female_frisk female_human female_penetrated femsub feral feral_on_female feral_on_human feral_penetrating feral_penetrating_human fluffy_ears fluffy_tail footwear frisk frisk_(undertale) from_behind_position front_view fur furry_balls genital_fluids genitals hair hetero holding_head huge_penis human indoors interspecies kneel knot large_ass large_balls large_penis larger_feral larger_male larger_penetrating larger_penetrating_smaller legs_apart light-skinned_female light_skin male male/female male_feral/female_human male_penetrating male_penetrating_female maledom medium_hair monster multi_leg multi_limb on_floor open_mouth partially_clothed paw paw_on_head paws penetration penis penis_in_pussy pussy_juice pussy_juice_string raised_leg sequence sequential sex sex_from_behind shirt shoes signature size_difference small_sub small_sub_big_dom smaller_female smaller_human smaller_penetrated smaller_sub smaller_sub_bigger_dom straight striped_clothing submissive submissive_female submissive_human sweater sydneysnack tail teeth testicle text thick_thighs thighs tongue top-down_bottom-up topwear trembling undertale undertale_(series) vaginal vaginal_juices vaginal_penetration vaginal_sex video_game_character video_games white_body white_fur wide_hips zoophilia
2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth text theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi
2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth text theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi
2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo english_text fontcest gloves happy_new_year imminent_sex incest intraspecies male male/male male_only maledom malesub monster monster_boy new_year papyrus papyrus_(undertale) papysans questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom speech_bubble submissive submissive_male taped_mouth text text_bubble theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi
2010s 2017 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans bound bound_wrists brother brother/brother brother_and_brother brothers christmas clothed clothing digital_media_(artwork) dominant dominant_male domination duo english_text fontcest gloves happy_new_year imminent_sex incest intraspecies male male/male male_only maledom malesub monster monster_boy new_year papyrus papyrus_(undertale) papysans questionable_consent red_gloves red_scarf sans sans_(undertale) santa_hat scarf seme_papyrus sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom speech_bubble submissive submissive_male taped_mouth text text_bubble theyaois tied_up tied_wrists top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi
1boy 1girl 1girl1boy 2d 2d_(artwork) animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_penetrating bigger_penetrating_smaller blue_blush blush boss_monster bottom_sans bottomless bottomless_male bra breasts caprine digital_media_(artwork) dildo doggy_position dominant dominant_anthro dominant_female drooling duo ectoplasm english_text female/male female_anthro female_penetrating female_penetrating_male femdom floppy_ears from_behind_position fur furry furry_female goat goat_ears goat_girl goat_horns grabbing_sheets grey_background gripping_sheets hetero horns humanoid humanoid_penetrated kneel larger_anthro larger_female larger_penetrating larger_penetrating_smaller male male_moaning male_penetrated malesub mature mature_anthro mature_female milf moaning monster monster_girl motion_lines partially_colored pegging penetration penetration_from_behind profanity sans sans_(undertale) sex sex_from_behind sex_toy simple_background size_difference skeleton small_sub small_sub_big_dom smaller_humanoid smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straight strap-on submissive submissive_male sweat tail tail_tuft talking talking_to_another talking_to_partner tears text thrusting topwear toriel torisans uke_sans undead undertale undertale_(series) underwear unknown_artist video_game_character video_games white_body white_fur
1boy 1girl 1girl1boy 2d 2d_(artwork) animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_penetrating bigger_penetrating_smaller blue_blush blush boss_monster bottom_sans bottomless bottomless_male bra breasts caprine digital_media_(artwork) dildo doggy_position dominant dominant_anthro dominant_female drooling duo ectoplasm english_text female/male female_anthro female_penetrating female_penetrating_male femdom floppy_ears from_behind_position fur furry furry_female goat goat_ears goat_girl goat_horns grabbing_sheets grey_background gripping_sheets hetero horns humanoid humanoid_penetrated kneel larger_anthro larger_female larger_penetrating larger_penetrating_smaller male male_moaning male_penetrated malesub mature mature_anthro mature_female milf moaning monster monster_girl motion_lines partially_colored pegging penetration penetration_from_behind profanity sans sans_(undertale) sex sex_from_behind sex_toy simple_background size_difference skeleton small_sub small_sub_big_dom smaller_humanoid smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straight strap-on submissive submissive_male sweat tail tail_tuft talking talking_to_another talking_to_partner tears text thrusting topwear toriel torisans uke_sans undead undertale undertale_(series) underwear unknown_artist video_game_character video_games white_body white_fur
1boy 1girl 1girl1boy 2010s 2018 2d 2d_(artwork) ahegao animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush boss_monster bottom_sans breasts caprine digital_media_(artwork) disembodied_hand disembodied_hands dominant dominant_anthro dominant_female dominant_pov duo ectoplasm ectotongue english_text female/male female_anthro female_penetrating female_penetrating_male female_pov femdom floppy_ears from_front_position fur furry furry_female goat goat_girl grabbing_sheets gripping_sheets heart-shaped_pupils heart_eyes hetero humanoid humanoid_penetrated interlocked_fingers intertwined_fingers ireallyneedtofindabetternamesoon larger_anthro larger_female larger_penetrating larger_penetrating_smaller leg_grab male male_focus male_moaning male_penetrated malesub mature mature_anthro mature_female milf moaning monster monster_boy monster_girl nude nude_male open_mouth partial_female pegging penetrating_pov penetration penetrator_pov pink_background pleasure_face pov pov_hands sans sans_(undertale) sequence sequential sex sex_toy simple_background size_difference skeleton small_sub small_sub_big_dom smaller_humanoid smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus straight strap-on submissive submissive_male tail tail_tuft tears text tongue tongue_out toriel torisans tumblr uke_sans undead undertale undertale_(series) unseen_female_face video_game_character video_games white_body white_fur
1boy 1girl 1girl1boy 2010s 2018 2d 2d_(artwork) ahegao animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush boss_monster bottom_sans breasts caprine digital_media_(artwork) disembodied_hand disembodied_hands dominant dominant_anthro dominant_female dominant_pov duo ectoplasm ectotongue english_text female/male female_anthro female_penetrating female_penetrating_male female_pov femdom floppy_ears from_front_position fur furry furry_female goat goat_girl grabbing_sheets gripping_sheets heart-shaped_pupils heart_eyes hetero humanoid humanoid_penetrated interlocked_fingers intertwined_fingers ireallyneedtofindabetternamesoon larger_anthro larger_female larger_penetrating larger_penetrating_smaller leg_grab male male_focus male_moaning male_penetrated malesub mature mature_anthro mature_female milf moaning monster monster_boy monster_girl nude nude_male open_mouth partial_female pegging penetrating_pov penetration penetrator_pov pink_background pleasure_face pov pov_hands sans sans_(undertale) sequence sequential sex sex_toy simple_background size_difference skeleton small_sub small_sub_big_dom smaller_humanoid smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus straight strap-on submissive submissive_male tail tail_tuft tears text tongue tongue_out toriel torisans tumblr uke_sans undead undertale undertale_(series) unseen_female_face video_game_character video_games white_body white_fur
1boy 2020s 2023 2d 2d_(artwork) animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_blush blush bodily_fluids bottom_sans canid canine canine_genitalia canine_penis canis clothed digital_media_(artwork) dog dog_tags duo ech7474 ectopussy faceless_male fluids from_behind_position furry furry_male genitals hetero hooded_jacket hoodie humanoid_penetrated interspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_anthro monster neck_grab penetration penis pussy pussy_juice sans sans_(undertale) sex sex_from_behind simple_background size_difference skeleton slippers small_sub small_sub_big_dom smaller_female smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus straight sweater tongue tongue_out topwear twitter uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games
1boy 2020s 2023 2d 2d_(artwork) animated_skeleton anthro anthro_penetrating anthro_penetrating_humanoid artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_blush blush bodily_fluids bottom_sans canid canine canine_genitalia canine_penis canis clothed digital_media_(artwork) dog dog_tags duo ech7474 ectopussy faceless_male fluids from_behind_position furry furry_male genitals hetero hooded_jacket hoodie humanoid_penetrated interspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_anthro monster neck_grab penetration penis pussy pussy_juice sans sans_(undertale) sex sex_from_behind simple_background size_difference skeleton slippers small_sub small_sub_big_dom smaller_female smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus straight sweater tongue tongue_out topwear twitter uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers completely_nude completely_nude_male digital_media_(artwork) duo ectopenis ectoplasm fluids fontcest from_front_position genitals goma_dango_555 incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_on_back lying_on_bed male male_only male_penetrating missionary_position monster monster_boy nude nude_male on_back on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_front penis pillow pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears toony top_papyrus trembling uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath yaoi
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers completely_nude completely_nude_male digital_media_(artwork) duo ectopenis ectoplasm fluids fontcest from_front_position genitals goma_dango_555 incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_on_back lying_on_bed male male_only male_penetrating missionary_position monster monster_boy nude nude_male on_back on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_front penis pillow pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears toony top_papyrus trembling uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath yaoi
2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clock clothed curtains duo ectopenis ectoplasm fontcest from_front_position genitals goma_dango_555 incest indoors intraspecies larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating mastery_position monster monster_boy night on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_front penis pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series) video_games wall_clock window yaoi
2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clock clothed curtains duo ectopenis ectoplasm fontcest from_front_position genitals goma_dango_555 incest indoors intraspecies larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating mastery_position monster monster_boy night on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_front penis pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series) video_games wall_clock window yaoi
2020s 2021 2boys 2d 2d_(artwork) against_the_wall against_wall alley anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller biting_clothes biting_shirt blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing digital_media_(artwork) duo ectopenis fontcest from_front_position goma_dango_555 hooded_jacket hoodie incest intraspecies jacket kabedon larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy orange_blush pants_around_one_leg pants_down papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_front penis pinned pinned_to_wall pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front shoes sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex toony top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure) yaoi
2020s 2021 2boys 2d 2d_(artwork) against_the_wall against_wall alley anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller biting_clothes biting_shirt blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing digital_media_(artwork) duo ectopenis fontcest from_front_position goma_dango_555 hooded_jacket hoodie incest intraspecies jacket kabedon larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy orange_blush pants_around_one_leg pants_down papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_front penis pinned pinned_to_wall pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sex_from_front shoes sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom stealth_sex toony top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games wall wall_(structure) yaoi
2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo fontcest from_front_position goma_dango_555 incest indoors intraspecies kissing kneeling larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy on_bed orange_blush papyrus papyrus_(undertale) papysans partially_clothed penetration pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo fontcest from_front_position goma_dango_555 incest indoors intraspecies kissing kneeling larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrating monster monster_boy on_bed orange_blush papyrus papyrus_(undertale) papysans partially_clothed penetration pixiv_id_49095896 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on toony top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
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2010s 2017 2boys 2d 2d_(artwork) after_sex anal anal_penetration anal_sex animated_skeleton arm_around_another's_neck arm_around_neck ass big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blush bottom_sans bottomless closed_eyes completely_nude completely_nude_male digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fire_elemental from_front_position grillby hand_on_back hand_on_neck humanoid interlocked_fingers intertwined_fingers korean_text larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub missionary_position monster monster_boy multiple_views muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male text top_grillby topless uke_sans undead undertale undertale_(series) video_game_character video_games white_background window yaoi yooutnsfw
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton arm_support big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_hoodie blue_jacket blush bottom_sans bottomless closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectoplasm elemental_creature elemental_humanoid eyewear fire_elemental from_behind_position from_front_position glasses grillby grillsans hooded_jacket hoodie humanoid jacket kissing larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub mastery_position monster monster_boy motion_lines multiple_views nude nude_male oaytacnoom orange_body orange_penis penetration penis rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straddling submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) video_games visible_breath white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton arm_support big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_hoodie blue_jacket blush bottom_sans bottomless closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectoplasm elemental_creature elemental_humanoid eyewear fire_elemental from_behind_position from_front_position glasses grillby grillsans hooded_jacket hoodie humanoid jacket kissing larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub mastery_position monster monster_boy motion_lines multiple_views nude nude_male oaytacnoom orange_body orange_penis penetration penis rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom straddling submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) video_games visible_breath white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blush bodily_fluids bottom_sans bottomless chubby chubby_male claws closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectobelly ectobody ectopenis elemental_creature elemental_humanoid fire_elemental fluids from_behind_position grillby grillsans hooded_jacket hoodie humanoid jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy nude nude_male orange_body orange_penis partially_clothed penetration penetration_from_behind penis precum sans sans_(undertale) seme_grillby sex sex_from_behind simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) unseen_male_face video_games weirddworms white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blush bodily_fluids bottom_sans bottomless chubby chubby_male claws closed_eyes clothed clothing digital_media_(artwork) domimant domimant_male duo ectobelly ectobody ectopenis elemental_creature elemental_humanoid fire_elemental fluids from_behind_position grillby grillsans hooded_jacket hoodie humanoid jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy nude nude_male orange_body orange_penis partially_clothed penetration penetration_from_behind penis precum sans sans_(undertale) seme_grillby sex sex_from_behind simple_background size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male sweat top_grillby topwear uke_sans undead undertale undertale_(series) unseen_male_face video_games weirddworms 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
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 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
2020s 2023 2boys 2d 2d_(artwork) all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing) boxers_around_one_leg brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing) boxers_around_one_leg brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2023 2boys 2d 2d_(artwork) anger_vein animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers cape clothed clothing digital_media_(artwork) duo fontcest grabbing_hand hand_grab hooded_jacket hoodie imminent_sex inactive_account incest jacket kissing larger_male male male/male male_only monochrome monster monster_boy multiple_views pants_around_legs papyrus papyrus_(undertale) papysans pinned_down sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus toubigaizi twitter uke_sans undead undertale undertale_(series) valentine's_day video_game_character video_games white_background yaoi
2020s 2023 2boys 2d 2d_(artwork) anger_vein animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers cape clothed clothing digital_media_(artwork) duo fontcest grabbing_hand hand_grab hooded_jacket hoodie imminent_sex inactive_account incest jacket kissing larger_male male male/male male_only monochrome monster monster_boy multiple_views pants_around_legs papyrus papyrus_(undertale) papysans pinned_down sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus toubigaizi twitter uke_sans undead undertale undertale_(series) valentine's_day video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2020s 2023 2boys animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo fontcest grabbing_leg incest intraspecies kissing kissing_crotch larger_male leg_grab male male/male male_only monochrome monster monster_boy naked nude papyrus papyrus_(undertale) papysans purplebluepen45 sans sans_(undertale) seme_papyrus sibling_incest siblings size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2020s 2023 2boys animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo fontcest grabbing_leg incest intraspecies kissing kissing_crotch larger_male leg_grab male male/male male_only monochrome monster monster_boy naked nude papyrus papyrus_(undertale) papysans purplebluepen45 sans sans_(undertale) seme_papyrus sibling_incest siblings size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) animated_skeleton anon anonymous artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis bottom_sans collar collar_only digital_media_(artwork) duo ectopenis grabbing_chest hand_on_another's_chest hand_on_another's_head hand_on_chest hand_on_head handjob male male_focus male_only monster naked nude one_eye_closed penis pet_play petplay sans sans_(undertale) simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tears third-party_source trembling uke_sans undead undertale undertale_(series) video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) animated_skeleton anon anonymous artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis bottom_sans collar collar_only digital_media_(artwork) duo ectopenis grabbing_chest hand_on_another's_chest hand_on_another's_head hand_on_chest hand_on_head handjob male male_focus male_only monster naked nude one_eye_closed penis pet_play petplay sans sans_(undertale) simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tears third-party_source trembling uke_sans undead undertale undertale_(series) video_games yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy anger_vein animated_skeleton artist_name ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male boots bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brothers clothed clothing cobe-87 cuntboy cuntboysub dominant dominant_male domination duo ectobody ectobutt ectopussy english_text fontcest hoodie incest jacket larger_male male male/cuntboy maledom monochrome monster papyrus papyrus_(undertale) papysans partially_colored profanity punishment pussy pussy_juice sans sans_(undertale) seme_papyrus size_difference skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom spank_marks spanking spanking_ass spanking_butt speech_bubble submissive submissive_cuntboy talking_to_another tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2d 2d_(artwork) 3_girls almost_caught alphys animated_skeleton anthro apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris clothed comic comic_page comic_panel cuntboy cuntboy_penetrated digital_media_(artwork) dinosaur dinosaur_girl duo duo_focus ectopenis ectopussy edit edited eli-sin-g english_text female_anthro fontcest frisk frisk_(undertale) from_behind_position from_front_position genitals grabbing_arms grabbing_from_behind grabbing_leg human humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab lizard lizard_girl long_image male male/cuntboy male_focus male_penetrating male_penetrating_cuntboy monochrome monster monster_boy monster_girl on_counter onomatopoeia orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_behind penis pussy reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sequence sequential sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex talking tall_image text text_bubble third-party_edit top_papyrus toriel uke_sans undead undertale undertale_(series) undyne vaginal video_game_character video_games yaoi
1boy 1cuntboy 2d 2d_(artwork) 3_girls almost_caught alphys animated_skeleton anthro apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris clothed comic comic_page comic_panel cuntboy cuntboy_penetrated digital_media_(artwork) dinosaur dinosaur_girl duo duo_focus ectopenis ectopussy edit edited eli-sin-g english_text female_anthro fontcest frisk frisk_(undertale) from_behind_position from_front_position genitals grabbing_arms grabbing_from_behind grabbing_leg human humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab lizard lizard_girl long_image male male/cuntboy male_focus male_penetrating male_penetrating_cuntboy monochrome monster monster_boy monster_girl on_counter onomatopoeia orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_from_behind penis pussy reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sequence sequential sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex talking tall_image text text_bubble third-party_edit top_papyrus toriel uke_sans undead undertale undertale_(series) undyne vaginal video_game_character video_games yaoi
2boys 2d anal anal_sex animated_skeleton barista big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_sclera blue_blush blush bottom_sans bottomless closed_eyes digital_media_(artwork) duo ectopenis ectoplasm elemental_creature elemental_humanoid erect_while_penetrated erection fire_elemental from_behind_position glasses grillby grillsans handjob handjob_while_penetrating humanoid kissing larger_dom larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating monochrome monster monster_boy penetration penis pink_theme sans sans_(undertale) sansby seme_grillby shandrawaka simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom t-shirt tears top_grillby trembling uke_sans undead undertale undertale_(series) white_background yaoi
2boys 2d anal anal_sex animated_skeleton barista big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_sclera blue_blush blush bottom_sans bottomless closed_eyes digital_media_(artwork) duo ectopenis ectoplasm elemental_creature elemental_humanoid erect_while_penetrated erection fire_elemental from_behind_position glasses grillby grillsans handjob handjob_while_penetrating humanoid kissing larger_dom larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating monochrome monster monster_boy penetration penis pink_theme sans sans_(undertale) sansby seme_grillby shandrawaka simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom t-shirt tears top_grillby trembling uke_sans undead undertale undertale_(series) white_background yaoi