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1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_pussy blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male duo ectopenis ectopussy ectotongue fontcest genitals headgear heart-shaped_pupils heart_eyes humanoid incest indoors intraspecies male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind penetration_through_clothes penis penis_in_pussy penis_through_clothing pussy pussy_through_clothing sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings skeleton speech_bubble submissive submissive_cuntboy titleze tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork)animated_skeleton blue_blush blue_pussy blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork)dominant dominant_male duo ectopenis ectopussy ectotongue fontcest genitals headgear heart-shaped_pupils heart_eyes humanoid incest indoors intraspecies male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale)papysans partially_colored penetration penetration_from_behind penetration_through_clothes penis penis_in_pussy penis_through_clothing pussy pussy_through_clothing sans sans_(undertale)seme_papyrus sequence sequential sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings skeleton speech_bubble submissive submissive_cuntboy titleze tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series)vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_pussy blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male duo ectopenis ectopussy ectotongue fontcest genitals headgear heart-shaped_pupils heart_eyes humanoid incest indoors intraspecies male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind penetration_through_clothes penis penis_in_pussy penis_through_clothing pussy pussy_through_clothing sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings skeleton speech_bubble submissive submissive_cuntboy titleze tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton blank_speech_bubble blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel cuntboy cuntboy_penetrated cuntboysub digital_media_(artwork) dominant dominant_male duo ectopenis ectopussy ectotongue fontcest from_behind_position genitals humanoid incest indoors intraspecies male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind penetration_through_clothes penis penis_in_pussy penis_through_clothing pussy pussy_through_clothing sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings skeleton speech_bubble submissive submissive_cuntboy titleze top_papyrus uke_sans undead undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton blank_speech_bubble blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brothers clothed comic comic_page comic_panel cuntboy cuntboysub digital_media_(artwork) dominant dominant_male duo ectopenis ectopussy erection fontcest genitals humanoid imminent_penetration imminent_sex imminent_vaginal incest indoors intraspecies male male/cuntboy maledom monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penis penis_through_clothing pussy pussy_through_clothing sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton speech_bubble spread_pussy submissive submissive_cuntboy titleze top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi