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digital_media_(artwork) drooling ectobody ectoplasm ectopussy edit edited fluids fontcest genitals haxarel hoodie jacket long_image monster off_shoulder orange_cum papysans partially_clothed pussy sans sans_(undertale) skeleton solo_cuntboy spread_legs third-party_edit topwear uke_sans undead undertale undertale_(series) video_games yaoi 1cuntboy 2010s 2017 2d 2d_(artwork) after_oral after_sex after_vaginal alternate_version_available animated_skeleton anus blue_body blue_clitoris blue_hoodie blue_jacket blue_pussy bodily_fluids bottle bottom_sans bottomless bottomless_cuntboy clitoris clothed clothing cum cum_in_mouth cum_in_pussy cuntboy cuntboy_only digital_media_(artwork) drooling ectobody ectoplasm ectopussy edit edited fluids fontcest genitals haxarel hoodie jacket long_image monster off_shoulder orange_cum papysans partially_clothed pussy sans sans_(undertale) skeleton solo_cuntboy spread_legs tall_image third-party_edit topwear uke_sans undead undertale undertale_(series) video_games yaoi 1cuntboy 2010s 2017 2d 2d_(artwork) after_oral after_sex after_vaginal alternate_version_available animated_skeleton anus blue_body blue_clitoris blue_hoodie blue_jacket blue_pussy bodily_fluids bottle bottom_sans bottomless bottomless_cuntboy clitoris clothed clothing cum cum_in_mouth cum_in_pussy cuntboy cuntboy_only digital_media_(artwork) drooling ectobody ectoplasm ectopussy fluids fontcest genitals haxarel hoodie jacket monster off_shoulder orange_cum papysans partially_clothed pussy sans sans_(undertale) skeleton solo_cuntboy spread_legs topwear uke_sans undead undertale undertale_(series) video_games yaoi 1cuntboy 2010s 2017 2d 2d_(artwork) alternate_version_available animated_skeleton anus blue_body blue_clitoris blue_hoodie blue_jacket blue_pussy bottle bottom_sans bottomless bottomless_cuntboy clitoris clothed clothing cuntboy cuntboy_only digital_media_(artwork) drooling ectobody ectoplasm ectopussy fluids genitals haxarel hoodie jacket monster off_shoulder pussy sans sans_(undertale) skeleton solo_cuntboy spread_legs topwear uke_sans undead undertale undertale_(series) video_games yaoi 1boy 1cuntboy 2010s 2016 2d 2d_(artwork) ahegao animated_skeleton artist_name blue_blush blue_body blue_tongue blush bodily_fluids bottom_sans bottomless bottomless_cuntboy brother brother/brother brother_and_brother brother_penetrating_brother brothers brown_background carrying carrying_partner carrying_position clothed clothing cuntboy cuntboy_penetrated digital_media_(artwork) duo ectobody ectopenis ectoplasm ectopussy ectotongue english_text fangs fontcest gasterass gradient_legwear heart-shaped_pupils incest legwear male male/cuntboy male_penetrating male_penetrating_cuntboy monster nude orange_body orange_penis orange_tongue orsnge_blush papyrus papyrus_(undertale) papysans penetration penis pleasure_face profanity pussy sans sans_(undertale) seme_papyrus sex simple_background sitting skeleton solid_color_background speech_bubble stockings talking talking_to_another talking_to_partner text thighhighs tongue tongue_out top_papyrus topwear two-tone_legwear two_tone_legwear uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_games yaoi 1boy 1cuntboy 2020s 2023 2d 2d_(artwork) animated_skeleton aokisk artist_name big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris clothed clothing crying crying_with_eyes_open cuntboy cuntboy_penetrated digital_media_(artwork) drooling duo ectopenis ectopussy english_text fontcest from_behind_position genitals gloves grey_background grey_socks hand_under_clothes holding_hand incest kneel larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy male_only male_penetrating male_penetrating_cuntboy monster orange_blush orange_eye orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis pussy red_gloves riding riding_penis sans sans_(undertale) seme_papyrus sex sex_from_behind simple_background sitting skeleton smaller_cuntboy smaller_penetrated socks talking_to_another talking_to_partner tears text tongue tongue_out top_papyrus topwear twitter_username uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games 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 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 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 1cuntboy 2010s 2019 2d 2d_(artwork) absurd_res absurdres animated_skeleton artist_logo artist_name blue_blush blue_hoodie blue_jacket blue_pussy blush bondage bottom_sans bottomless bottomless_cuntboy bound bound_arms bound_legs bound_wrists candy_cane christmas christmas_lights clothed clothing cuntboy cuntboy_only digital_media_(artwork) drooling ectoplasm ectopussy english_text fontcest ganzooky holidays hooded_jacket hoodie implied_incest jacket legs_apart male male_only merry_christmas mistletoe monster nsfwsinningsans object_in_mouth object_insertion papysans penetration pink_slippers pussy red_ribbon restrained restraints ribbon sans sans_(undertale) skeleton slippers spreader_bar submissive text tied_arms tied_up tied_wrists uke_sans undead undertale undertale_(series) vaginal vaginal_insertion vaginal_object_insertion video_games 1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_name back_view bottom_sans bottomless bottomless_cuntboy cuntboy cuntboy_focus cuntboy_penetrated cuntboysub digital_media_(artwork) ectopussy heart_eyes hooded_jacket hoodie jacket kneel kneeling laddinger line_art lineart looking_at_viewer looking_back looking_back_at_viewer male monster partially_colored penetration pussy rear_view sans sans_(undertale) sex simple_background skeleton solo_focus submissive submissive_cuntboy trembling uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games visible_breath white_background ... 1boy 1cuntboy 2010s 2018 2d 2d_(artwork) anger_vein animated_skeleton artist_name blue_blush blue_pussy blue_tongue blush bottom_sans bottomless bottomless_cuntboy bound brothers clothed cuntboy digital_media_(artwork) duo ectopussy ectotongue edit edited english_text fontcest imminent_penetration incest joke long_image male male/cuntboy monster multiple_images orange_blush orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential sex simple_background skeleton slimeybonez solo_focus speech_bubble spoken_ellipsis talking tall_image tentacle tentacle_penetration tentacle_sex tentacles_around_legs tentacles_around_wrists text text_bubble third-party_edit tongue top_papyrus uke_sans undead undertale undertale_(series) upper_body video_game_character video_games white_background yaoi 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound clothed cuntboy cuntboy_focus ectopussy english_text fontcest incest monster orange_tentacles papysans partially_colored penetration pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential simple_background skeleton slimeybonez solo_focus tentacle tentacle_penetration tentacle_sex text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound clothed cuntboy cuntboy_focus ectopussy english_text fontcest imminent_penetration incest joke monster orange_tentacles papysans partially_colored pun pussy pussy_focus sans sans_(undertale) seme_papyrus sequence sequential simple_background skeleton slimeybonez solo_focus tentacle text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face white_background 1cuntboy 2010s 2018 animated_skeleton artist_name blue_blush blue_pussy blush bottom_sans bottomless bottomless_cuntboy bound clothed cuntboy cuntboy_focus ectopussy english_text fontcest incest monster orange_tentacles papysans partially_colored pussy sans sans_(undertale) seme_papyrus sequence sequential simple_background skeleton slimeybonez solo_focus tentacle tentacles_around_legs tentacles_around_wrists top_papyrus uke_sans undead undertale undertale_(series) unseen_character white_background