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brothers cock_hungry cum cumshot drooling duo ectopenis ectoplasm english_text fantasizing fontcest genitals glowing glowing_genitalia glowing_penis hands_on_cheeks hands_on_own_cheeks heart-shaped_pupils heart_eyes hooded_jacket hoodie hoodie_only incest jacket looking_at_penis looking_down male male/male male_only measurements monster multiple_views nude orange_cum orange_penis otterrpopp papyrus papyrus_(undertale) penis penis_measurement penis_measuring precum sans sans_(undertale) skeleton small_penis smooth_penis solo_focus talking talking_to_self text thinking third-party_source topwear undead undertale undertale_(series) unseen_character unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi 1boy 2d 2d_(artwork) animated_skeleton ass blue_blush blue_penis blush bodily_fluids clothing couch digital_media_(artwork) ectopenis erection fluids genitals glowing glowing_genitalia glowing_penis hooded_jacket hoodie jacket male male_masturbation 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ectopenis fontcest from_front_position genitals glowing glowing_genitalia glowing_penis heart-shaped_pupils heart_eyes incest jacket kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster off_shoulder orange_blush orange_penis papyrus papyrus_(undertale) papysans penis realdemdemdmensfw sans sans_(undertale) seme_papyrus sex skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male sweat top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name ass bigger_male blue_blush blue_penis blush bottom_sans brother brother/brother brother_and_brother brothers closed_eyes dated duo ectopenis fontcest genitals glowing glowing_genitalia glowing_penis hand_on_another's_head hand_on_head incest kissing larger_male male male/male male_only monster naked_male nude nude_male 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1cuntboy 2010s 2015 animated_skeleton artist_name blue_blush blue_eye blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cuntboy cuntboy_focus cuntboysub dominant_male duo ectopenis ectopussy english_text fontcest gay glowing glowing_eye glowing_genitalia glowing_penis glowing_pussy incest laddinger leg_lift legs_up line_art lineart male male/cuntboy male_out_of_frame maledom monster naked nude orange_penis papyrus papyrus_(undertale) papysans partially_colored penis pussy sans sans_(undertale) seme_papyrus skeleton solo_focus submissive_cuntboy sweat text top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face watermark white_background yaoi 1boy 2010s 2017 2d 2d_(artwork) absurd_res animated_skeleton bone clothed clothing clothing_undone digital_media_(artwork) genitals ghost glowing glowing_eyes glowing_penis hair high_res holding_camera holding_object lewis_pepper male male_only melle-d mellednsfw mystery_skulls penis penis_out 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