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1boy 1cuntboy 2d 2d_(artwork) after_sex animated_skeleton blue_pussy blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothed_male cum_in_pussy cuntboy cuntboysub digital_media_(artwork) dominant_male duo ectopussy edit edited fontcest humanoid implied_penetration implied_sex implied_vaginal incest long_image male male/cuntboy male_focus maledom monster monster_boy multiple_images nude orange_blush papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings sinfulsanspar skeleton sleep_sex sleeping solo_focus somnophilia submissive_cuntboy sweat tall_image third-party_edit top-down_bottom-up top_papyrus tumblr uke_sans undead undertale undertale_(series) upper_body video_games visible_breath wide_eyed yaoi
1boy 1cuntboy 2d 2d_(artwork) after_sex animated_skeleton blue_pussy blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothed_male cum_in_pussy cuntboy cuntboysub digital_media_(artwork) dominant_male duo ectopussy edit edited fontcest humanoid implied_penetration implied_sex implied_vaginal incest long_image male male/cuntboy male_focus maledom monster monster_boy multiple_images nude orange_blush papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings sinfulsanspar skeleton sleep_sex sleeping solo_focus somnophilia submissive_cuntboy sweat tall_image third-party_edit top-down_bottom-up top_papyrus tumblr uke_sans undead undertale undertale_(series) upper_body video_games visible_breath wide_eyed yaoi
1cuntboy 2010s 2017 2d 2d_(artwork) after_sex animated_skeleton blue_pussy bottom_sans clothed/nude completely_nude cum_in_pussy cum_leaking cum_leaking_out_of_pussy cuntboy cuntboysub digital_media_(artwork) ectopussy fontcest humanoid implied_incest lying_on_back male/cuntboy monster monster_boy nude orange_cum papysans pussy sans sans_(undertale) sinfulsanspar skeleton sleeping solo somnophilia submissive_cuntboy tumblr uke_sans unaware undead undertale undertale_(series) video_game_character video_games yaoi
1cuntboy 2010s 2017 2d 2d_(artwork) after_sex animated_skeleton blue_pussy bottom_sans clothed/nude completely_nude cum_in_pussy cum_leaking cum_leaking_out_of_pussy cuntboy cuntboysub digital_media_(artwork) ectopussy fontcest humanoid implied_incest lying_on_back male/cuntboy monster monster_boy nude orange_cum papysans pussy sans sans_(undertale) sinfulsanspar skeleton sleeping solo somnophilia submissive_cuntboy tumblr uke_sans unaware undead undertale undertale_(series) video_game_character video_games yaoi
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton blush clothed clothed/nude clothed_male digital_media_(artwork) fontcest humanoid implied_incest implied_penetration implied_sex implied_yaoi incest male male/cuntboy male_focus male_only monster monster_boy orange_blush papyrus papyrus_(undertale) papysans seme_papyrus sinfulsanspar skeleton solo_focus somnophilia sweat top_papyrus tumblr undead undertale undertale_(series) upper_body video_games visible_breath yaoi
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton blush clothed clothed/nude clothed_male digital_media_(artwork) fontcest humanoid implied_incest implied_penetration implied_sex implied_yaoi incest male male/cuntboy male_focus male_only monster monster_boy orange_blush papyrus papyrus_(undertale) papysans seme_papyrus sinfulsanspar skeleton solo_focus somnophilia sweat top_papyrus tumblr undead undertale undertale_(series) upper_body video_games visible_breath yaoi
1boy 1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton blue_pussy blush brother brother/brother brother_and_brother brothers clothed clothed/nude clothed_male cuntboy digital_media_(artwork) duo ectopussy fontcest humanoid imminent_incest imminent_penetration imminent_sex imminent_vaginal imminent_yaoi male male/cuntboy monster monster_boy nude orange_blush papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) sinfulsanspar skeleton sleeping somnophilia sweat top-down_bottom-up tumblr undead undertale undertale_(series) video_games wide_eyed yaoi
1boy 1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton blue_pussy blush brother brother/brother brother_and_brother brothers clothed clothed/nude clothed_male cuntboy digital_media_(artwork) duo ectopussy fontcest humanoid imminent_incest imminent_penetration imminent_sex imminent_vaginal imminent_yaoi male male/cuntboy monster monster_boy nude orange_blush papyrus papyrus_(undertale) papysans pussy sans sans_(undertale) sinfulsanspar skeleton sleeping somnophilia sweat top-down_bottom-up tumblr undead undertale undertale_(series) video_games wide_eyed yaoi
1boy 2010s 2017 dominant dominant_male english_text flower flowey_the_flower male male_only plant plant_tentacle seme_flowey sinfulsanspar sketch solo_male talking_to_viewer tentacle tentacles text top_flowey undertale undertale_(series) vine_tentacles vines white_background
1boy 2010s 2017 dominant dominant_male english_text flower flowey_the_flower male male_only plant plant_tentacle seme_flowey sinfulsanspar sketch solo_male talking_to_viewer tentacle tentacles text top_flowey undertale undertale_(series) vine_tentacles vines white_background
1boy 2010s 2017 dominant dominant_male english_text flower flowey_the_flower male male_only penis penis_towards_viewer plant seme_flowey sinfulsanspar sketch smile smiling_at_viewer solo solo_male talking_to_viewer text top_flowey undertale undertale_(series) white_background
1boy 2010s 2017 dominant dominant_male english_text flower flowey_the_flower male male_only penis penis_towards_viewer plant seme_flowey sinfulsanspar sketch smile smiling_at_viewer solo solo_male talking_to_viewer text top_flowey undertale undertale_(series) white_background
2010s 2017 animated_skeleton barefeet blue_blush blush bottomless humping legs_apart legs_held_open legs_spread masturbation monster multiple_views one_eye_closed pillow pillow_humping pillow_sex sans sans_(undertale) sinfulsanspar skeleton sketch solo undead undertale undertale_(series) white_background
2010s 2017 animated_skeleton barefeet blue_blush blush bottomless humping legs_apart legs_held_open legs_spread masturbation monster multiple_views one_eye_closed pillow pillow_humping pillow_sex sans sans_(undertale) sinfulsanspar skeleton sketch solo undead undertale undertale_(series) white_background
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 2010s 2017 animated_skeleton bottomless full_body hooded_jacket hoodie jacket male male_only monster sans sans_(undertale) sinfulsanspar skeleton sketch solo solo_male sweater undead undertale undertale_(series) white_background
1boy 2010s 2017 animated_skeleton bottomless full_body hooded_jacket hoodie jacket male male_only monster sans sans_(undertale) sinfulsanspar skeleton sketch solo solo_male sweater undead undertale undertale_(series) white_background
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bottomless bottomless_male brothers duo exposed fontcest hooded_jacket hoodie implied_incest jacket looking_at_crotch male male_only monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) shirt_pulled_up shirt_up sinfulsanspar skeleton sketch solo_focus sweater undead undertale undertale_(series) video_game_character video_games white_background
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bottomless bottomless_male brothers duo exposed fontcest hooded_jacket hoodie implied_incest jacket looking_at_crotch male male_only monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) shirt_pulled_up shirt_up sinfulsanspar skeleton sketch solo_focus sweater undead undertale undertale_(series) video_game_character video_games white_background
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_hoodie blue_jacket blush digital_media_(artwork) exposed hooded_jacket hoodie jacket looking_away male male_only monster monster_boy pants_down pants_pulled_down sans sans_(undertale) shirt_lift shirt_pulled_up shirt_up simple_background sinfulsanspar skeleton solo_male sweater undead undertale undertale_(series) video_game_character video_games white_background
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_hoodie blue_jacket blush digital_media_(artwork) exposed hooded_jacket hoodie jacket looking_away male male_only monster monster_boy pants_down pants_pulled_down sans sans_(undertale) shirt_lift shirt_pulled_up shirt_up simple_background sinfulsanspar skeleton solo_male sweater undead undertale undertale_(series) video_game_character video_games white_background
2017 2boys 2d animated_skeleton blue_blush blue_tongue blush bottom_sans crying crying_with_eyes_open digital_media male male_penetrating monster penetration penetration_from_behind pillow_grab sans_(undertale) sanster seme_gaster sex sex_from_behind sinfulsanspar skeleton sketch smiling tears tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) video_games w.d._gaster yaoi
2017 2boys 2d animated_skeleton blue_blush blue_tongue blush bottom_sans crying crying_with_eyes_open digital_media male male_penetrating monster penetration penetration_from_behind pillow_grab sans_(undertale) sanster seme_gaster sex sex_from_behind sinfulsanspar skeleton sketch smiling tears tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) video_games w.d._gaster yaoi
1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton blue_blush blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy crying crying_with_eyes_open cuntboy cuntboy_focus cuntboy_penetrated digital_media_(artwork) ectopussy genitals grabbing_pillow heart legs_apart male/cuntboy male_penetrating male_penetrating_cuntboy open_mouth penetration penis penis_in_pussy pussy sans sans_(undertale) sex sinfulsanspar skeleton solo_focus spread_legs tank_top tears uke_sans undead undertale undertale_(series) unseen_male unseen_male_face vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton blue_blush blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy crying crying_with_eyes_open cuntboy cuntboy_focus cuntboy_penetrated digital_media_(artwork) ectopussy genitals grabbing_pillow heart legs_apart male/cuntboy male_penetrating male_penetrating_cuntboy open_mouth penetration penis penis_in_pussy pussy sans sans_(undertale) sex sinfulsanspar skeleton solo_focus spread_legs tank_top tears uke_sans undead undertale undertale_(series) unseen_male unseen_male_face vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi
2017 animated_skeleton blue_blush blush bottomless clothed drooling flashing hooded_jacket hoodie jacket monster sans sans_(undertale) sinfulsanspar skeleton solo undead undertale undertale_(series)
2017 animated_skeleton blue_blush blush bottomless clothed drooling flashing hooded_jacket hoodie jacket monster sans sans_(undertale) sinfulsanspar skeleton solo undead undertale undertale_(series)
2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers couch couch_sex duo fontcest from_behind_position gay heart heart-shaped_pupils heart_eyes humanoid incest larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy on_couch on_sofa orange_blush pants_down papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings sinfulsanspar size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers couch couch_sex duo fontcest from_behind_position gay heart heart-shaped_pupils heart_eyes humanoid incest larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy on_couch on_sofa orange_blush pants_down papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings sinfulsanspar size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi