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undead undertale undertale_(series) video_games yaoi 1:1 1:1_aspect_ratio 2010s 2016 animated_skeleton biting_clothes biting_shirt blue_blush blue_eye blush bottom_sans clothed glowing glowing_eye hooded_jacket hoodie jacket korean_text looking_at_viewer monster off_shoulder peng2_(artist) peng2_undertale_(artist) sans sans_(undertale) sitting skeleton soul submissive text uke_sans undead undertale undertale_(series) yellow_eye 2010s 2018 2boys 2males animated_skeleton blue_blush blush boner boner_in_pants boots bottom_sans brother/brother brothers clothed clothed_male clothing duo english_text erection erection_under_clothes fontcest gay gloves glowing glowing_genitalia grabbing_another's_chin grabbing_chin grabbing_sheets gripping_sheets hoodie incest jacket legs_apart male male/male male_only moaning monochrome monster orange_blush papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sitting skeleton socks soul soul_sex spookster sweat text 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sinisk skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 1:1 1:1_aspect_ratio 2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue bottom_sans clothed dark_background digital_media_(artwork) duplicate fel-fisk glowing hair hooded_jacket hoodie humanoid humanoid_robot jacket larger_male licking lower_resolution_duplicate male male/male male_only mettasans mettaton mettaton_ex one_eye_closed partially_clothed partially_nude pink_eyes pink_slippers pink_tongue robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out top_mettaton uke_sans undead undertale 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