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1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_request blue_blush blush bottom_sans clothed clothing digital_media_(artwork) disembodied_hand disembodied_hands english_text grey_background groping hand_under_clothes hand_under_shirt hands hooded_jacket hoodie jacket looking_at_viewer male male_focus malesub monster nervous partially_colored sans sans_(undertale) sequence sequential shirt_lift shirt_up simple_background skeleton solo_focus soul soul_sex submissive submissive_male sweat talking_to_viewer text topwear uke_sans undead undertale undertale_(series) upper_body video_games
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_request blue_blush blush bottom_sans clothed clothing digital_media_(artwork) disembodied_hand disembodied_hands english_text grey_background groping hand_under_clothes hand_under_shirt hands hooded_jacket hoodie jacket looking_at_viewer male male_focus malesub monster nervous partially_colored sans sans_(undertale) sequence sequential shirt_lift shirt_up simple_background skeleton solo_focus soul soul_sex submissive submissive_male sweat talking_to_viewer text topwear uke_sans undead undertale undertale_(series) upper_body video_games
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited gif grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton slideshow solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited gif grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton slideshow solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling edit edited grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text third-party_edit topwear uke_sans undead undertale undertale_(series)
1boy alternate_version_available animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling grey_background groping hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text topwear uke_sans undead undertale undertale_(series)
1boy alternate_version_available animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear closed_eyes clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling grey_background groping hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar leash_pull male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text topwear uke_sans undead undertale undertale_(series)
1boy alternate_version_available animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text topwear uke_sans undead undertale undertale_(series)
1boy alternate_version_available animated_skeleton ass blue_blush blue_eye blush bottom_sans bottomwear clothed clothing collar collar_and_leash disembodied_hand disembodied_hands drooling grey_background groping hand_grab hands hooded_jacket hoodie jacket lameandashamed leash leash_and_collar male male_focus malesub monster pants partially_colored sans sans_(undertale) sequence sequential simple_background skeleton solo_focus soul soul_sex submissive submissive_male text topwear uke_sans undead undertale undertale_(series)
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
!!!! 1boy 2010s 2016 2d 2d_(artwork) all_the_way_through anal animated_skeleton anon anonymous anthro arm big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bondage bottom_sans bottomless bound bound_arms claws digital_media_(artwork) duo exclamation_mark exclamation_point extreme_fisting extreme_penetration fisting fluids fur furry humanoid humanoid_focus larger_anthro larger_penetrating larger_penetrating_smaller male male/male male_focus malesub monster nude partially_colored paw penetration restrained restraints ribbon ribbon_bondage sans sans_(undertale) sequence sequential 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 submissive submissive_male sweat thesourceofmysins tied_arms tied_up topless uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games white_background
!!!! 1boy 2010s 2016 2d 2d_(artwork) all_the_way_through anal animated_skeleton anon anonymous anthro arm big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bondage bottom_sans bottomless bound bound_arms claws digital_media_(artwork) duo exclamation_mark exclamation_point extreme_fisting extreme_penetration fisting fluids fur furry humanoid humanoid_focus larger_anthro larger_penetrating larger_penetrating_smaller male male/male male_focus malesub monster nude partially_colored paw penetration restrained restraints ribbon ribbon_bondage sans sans_(undertale) sequence sequential 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 submissive submissive_male sweat thesourceofmysins tied_arms tied_up topless uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games white_background
1boy 2010s 2016 2d 2d_(artwork) all_the_way_through anal animated_skeleton anon anonymous anthro arm arms_behind_back big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bondage bottom_sans bottomless bound bound_arms claws digital_media_(artwork) duo ectotongue english_text extreme_fisting extreme_penetration fisting fluids fur furry humanoid humanoid_focus larger_anthro larger_penetrating larger_penetrating_smaller male male/male male_focus malesub monster nude partially_colored paw penetration restrained restraints ribbon ribbon_bondage sans sans_(undertale) sequence sequential 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 soul soul_sex submissive submissive_male sweat talking_to_another text thesourceofmysins tied_arms tied_up tongue tongue_out topless uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games white_background
1boy 2010s 2016 2d 2d_(artwork) all_the_way_through anal animated_skeleton anon anonymous anthro arm arms_behind_back big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bondage bottom_sans bottomless bound bound_arms claws digital_media_(artwork) duo ectotongue english_text extreme_fisting extreme_penetration fisting fluids fur furry humanoid humanoid_focus larger_anthro larger_penetrating larger_penetrating_smaller male male/male male_focus malesub monster nude partially_colored paw penetration restrained restraints ribbon ribbon_bondage sans sans_(undertale) sequence sequential 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 soul soul_sex submissive submissive_male sweat talking_to_another text thesourceofmysins tied_arms tied_up tongue tongue_out topless uke_sans undead undertale undertale_(series) unseen_character video_game_character video_games white_background
2010s 2017 2boys 2d animated_skeleton bottom_sans clothed clothed_male clothing digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fellatio fire_elemental grillby hand_on_another's_head hand_on_head head_grab heart-shaped_pupils heart_eyes hisuivirus hooded_jacket hoodie humanoid irrumatio jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy oral partial_male penetration penis penis_in_mouth sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male top_grillby topwear uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background yaoi
2010s 2017 2boys 2d animated_skeleton bottom_sans clothed clothed_male clothing digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fellatio fire_elemental grillby hand_on_another's_head hand_on_head head_grab heart-shaped_pupils heart_eyes hisuivirus hooded_jacket hoodie humanoid irrumatio jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy oral partial_male penetration penis penis_in_mouth sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male top_grillby topwear uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton ass big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_eyes blush bondage bottom_sans bottomless bound bound_arms closed_eyes clothed clothed_male clothing digital_media_(artwork) domimant domimant_male drooling duo elemental_creature elemental_humanoid eyewear fire_elemental glasses grillby heart-shaped_pupils heart_eyes hisuivirus humanoid larger_male larger_penetrating larger_penetrating_smaller laying_on_side legs_grab line_art lineart lying_on_side male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy on_bed penetration penis restrained restraints rope rope_bondage 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 sweat tied_up top_grillby topwear uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2017 2boys 2d anal anal_penetration anal_sex animated_skeleton ass big_dom bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blanket blue_eyes blush bondage bottom_sans bottomless bound bound_arms closed_eyes clothed clothed_male clothing digital_media_(artwork) domimant domimant_male drooling duo elemental_creature elemental_humanoid eyewear fire_elemental glasses grillby heart-shaped_pupils heart_eyes hisuivirus humanoid larger_male larger_penetrating larger_penetrating_smaller laying_on_side legs_grab line_art lineart lying_on_side male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy on_bed penetration penis restrained restraints rope rope_bondage 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 sweat tied_up top_grillby topwear uke_sans undead undertale undertale_(series) video_games white_background yaoi
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 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 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
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 1cuntboy 2020 2020s 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy clothed clothing cuntboy cuntboy_focus cuntboy_only cuntboysub digital_media_(artwork) ectoplasm ectopussy ectotongue hi_res high_res highres imminent_penetration imminent_sex imminent_tentacle_rape imminent_vaginal jacket legs_apart legs_held_open looking_down male monster octopus_tentacles off_shoulder partially_clothed partially_nude pussy reignbeaux13 sans sans_(undertale) shirt shirt_lift shirt_up simple_background skeleton solo_cuntboy submissive submissive_cuntboy suction_tentacles tentacle tentacle_grab tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_legs tongue tongue_out topwear two-tone_background uke_sans undead undertale undertale_(series) video_game_character video_games white_border yellow_tentacles
1:1 1:1_aspect_ratio 1cuntboy 2020 2020s 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy clothed clothing cuntboy cuntboy_focus cuntboy_only cuntboysub digital_media_(artwork) ectoplasm ectopussy ectotongue hi_res high_res highres imminent_penetration imminent_sex imminent_tentacle_rape imminent_vaginal jacket legs_apart legs_held_open looking_down male monster octopus_tentacles off_shoulder partially_clothed partially_nude pussy reignbeaux13 sans sans_(undertale) shirt shirt_lift shirt_up simple_background skeleton solo_cuntboy submissive submissive_cuntboy suction_tentacles tentacle tentacle_grab tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_legs tongue tongue_out topwear two-tone_background uke_sans undead undertale undertale_(series) video_game_character video_games white_border yellow_tentacles
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
2boys 2d 2d_(artwork) animated_skeleton artist_request blue_blush blue_tongue blush bodily_fluids bottom_sans clothing digital_media_(artwork) disembodied_penis ectotongue fangs fellatio fluids genitals grey_background licking licking_penis male male/male male_only monster oral orange_penis penis penis_grab sans sans_(undertale) sex simple_background skeleton solo_focus tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_request blue_blush blue_tongue blush bodily_fluids bottom_sans clothing digital_media_(artwork) disembodied_penis ectotongue fangs fellatio fluids genitals grey_background licking licking_penis male male/male male_only monster oral orange_penis penis penis_grab sans sans_(undertale) sex simple_background skeleton solo_focus tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton arms_around_another arms_around_another's_neck artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) drooling duo ectotongue empath__life fontcest grey_background hand_in_pants hand_under_clothes hands_on_another's_chest hands_on_chest incest kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing video_game_character video_games watermark yaoi
2020s 2022 2boys 2d 2d_(artwork) animated_skeleton arms_around_another arms_around_another's_neck artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers clothed clothing digital_media_(artwork) drooling duo ectotongue empath__life fontcest grey_background hand_in_pants hand_under_clothes hands_on_another's_chest hands_on_chest incest kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing video_game_character video_games watermark yaoi
... 2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers cape clothed clothing dialog dialogue digital_media_(artwork) duo ectotongue empath__life english_text fontcest gloves grey_background hands_around_neck hands_on_another's_shoulders hands_on_shoulders hooded_jacket hoodie incest jacket kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) scarf seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend text tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games watermark yaoi
... 2020s 2022 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother brother/brother brother_and_brother brothers cape clothed clothing dialog dialogue digital_media_(artwork) duo ectotongue empath__life english_text fontcest gloves grey_background hands_around_neck hands_on_another's_shoulders hands_on_shoulders hooded_jacket hoodie incest jacket kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male partially_nude saliva saliva_on_tongue saliva_trail sans sans_(undertale) scarf seme_papyrus sequence sequential sibling_incest siblings simple_background skeleton taking_off_clothes tel_a_friend text tongue top_papyrus topless topless_male twitter uke_sans undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games watermark yaoi
2010s 2018 2boys 2d 2d_(artwork) after_penetration after_sex anal animated_skeleton ass blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing completely_nude completely_nude_male cuddling cum cum_inside cum_leaking digital_media_(artwork) duo ectopenis ectoplasm erection fluids fontcest genital_fluids genitals hugging humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pillow pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) after_penetration after_sex anal animated_skeleton ass blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing completely_nude completely_nude_male cuddling cum cum_inside cum_leaking digital_media_(artwork) duo ectopenis ectoplasm erection fluids fontcest genital_fluids genitals hugging humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis pillow pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton apron ass big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_penis blush blush_lines bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers chinese_text clothed clothing duo ectopenis erection fontcest from_front_position humanoid incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy orange_background orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton apron ass big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_penis blush blush_lines bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers chinese_text clothed clothing duo ectopenis erection fontcest from_front_position humanoid incest intraspecies kneeling larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy orange_background orange_blush orange_penis pants papyrus papyrus_(undertale) papysans partially_clothed penetration penis penis_out penis_size_difference penis_through_fly sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis smaller_male smaller_penetrated socks speech_bubble text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unzipped unzipped_pants video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) alternate_costume anal anal_penetration anal_sex animated_skeleton ass bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm erection fluids fontcest formal formal_clothes formal_wear genital_fluids genitals humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male mianpigui_(wqw1201501125) monster monster_boy neck_tie necktie orange_blush orange_penis pants pants_around_legs papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated suit sweat top_papyrus uke_sans undead undertale undertale_(series) vest video_games white_background yaoi
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2010s 2018 2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blush blush_lines bodily_fluids bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm fluids fontcest humanoid incest intraspecies laying_on_back leg_grab legs_apart legs_spread lying_on_back male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125) monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting skeleton solo_focus tissue tissue_paper top_papyrus topwear uke_sans undead undertale undertale_(series) unseen_male_face used_tissue video_games visible_breath yaoi
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2010s 2018 2boys 2d 2d_(artwork) ambiguous_fingering anal anal_fingering animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blue_penis blush bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo ectopenis ectoplasm ectopussy erection fingering fingering_another fingering_partner fontcest genitals gloves humanoid incest intraspecies male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male orange_blush papyrus papyrus_(undertale) papysans partially_clothed partially_colored penetration penis pussy sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings sitting skeleton top_papyrus topwear trembling uke_sans undead undertale undertale_(series) vaginal video_games yaoi
... 2010s 2018 2boys 2d 2d_(artwork) after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork) duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale) papysans penis pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
... 2010s 2018 2boys 2d 2d_(artwork) after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork) duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale) papysans penis pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
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2010s 2018 2boys 2d 2d_(artwork) ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background duo ectopenis ectoplasm ectopussy erection fontcest humanoid incest intraspecies kissing leg_grab leg_up male male/male male_focus male_only male_penetrating mianpigui_(wqw1201501125) monster monster_boy on_side papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans sans_(undertale) scarf seme_papyrus sex shirt_up sibling_incest siblings simple_background skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
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2020s 2023 2boys 2d 2d_(artwork) animated_skeleton ass bed bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brothers clothed clothing dark dark_room duo fontcest humanoid incest kneeling male male/male male_focus male_only mianpigui_(wqw1201501125) monochrome monster monster_boy on_bed pants_around_legs pants_down pants_pulled_down papyrus papyrus_(undertale) papysans power_bottom sans sans_(undertale) seme_papyrus skeleton top_papyrus uke_sans undead undertale undertale_(series) video_games 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 2020s 2023 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton big_penis blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers deepthroat duo ectopenis fellatio fontcest huge_penis incest intraspecies long_penis male male/male male_only monster monster_boy monster_cock monster_penis oral orange_penis papyrus papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus top_papyrus traditional_media_(artwork) uke_sans uncensored undead undertale undertale_(series) unseen_male_face veiny_penis video_games yaoi youfoundta
1:1 1:1_aspect_ratio 2020s 2023 2boys 2d 2d_(artwork) after_deepthroat after_fellatio after_oral animated_skeleton big_penis blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers deepthroat duo ectopenis fellatio fontcest huge_penis incest intraspecies long_penis male male/male male_only monster monster_boy monster_cock monster_penis oral orange_penis papyrus papyrus_(undertale) papysans partially_colored penis purplebluepen45 sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus top_papyrus traditional_media_(artwork) uke_sans uncensored undead undertale undertale_(series) unseen_male_face veiny_penis video_games yaoi youfoundta
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans clothed clothing digital_media_(artwork) english_text glowing groping hand_on_chest hand_on_face hands implied_masturbation male male_focus male_only malesub monochrome monster multiple_views orgasm_face partially_clothed partially_colored sans sans_(undertale) shirtless sigh simple_background singingsans skeleton solo_focus solo_male submissive submissive_male talking_to_viewer text third-party_source topless topless_male trembling uke_sans undead undertale undertale_(series) video_games
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans clothed clothing digital_media_(artwork) english_text glowing groping hand_on_chest hand_on_face hands implied_masturbation male male_focus male_only malesub monochrome monster multiple_views orgasm_face partially_clothed partially_colored sans sans_(undertale) shirtless sigh simple_background singingsans skeleton solo_focus solo_male submissive submissive_male talking_to_viewer text third-party_source topless topless_male trembling uke_sans undead undertale undertale_(series) video_games