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animated animated_skeleton anterior_nasal_aperture anthro blank_expression bodily_fluids bone bottomwear bottomwear_down clothed clothing dominant dominant_male duo elemental_creature elemental_humanoid eli-sin-g_(artist) eyewear fire fire_creature flaming_hair from_front_position glasses grillby humanoid lying male male/male male_penetrating missionary_position monochrome monster not_furry on_back pants pants_down partially_clothed penetration pseudo_hair sans sans_(undertale) sex short_playtime shorts shorts_down skeleton spread_legs spreading sweat undead undertale undertale_(series)
animated animated_skeleton anterior_nasal_aperture anthro blank_expression bodily_fluids bone bottomwear bottomwear_down clothed clothing dominant dominant_male duo elemental_creature elemental_humanoid eli-sin-g_(artist) eyewear fire fire_creature flaming_hair from_front_position glasses grillby humanoid lying male male/male male_penetrating missionary_position monochrome monster not_furry on_back pants pants_down partially_clothed penetration pseudo_hair sans sans_(undertale) sex short_playtime shorts shorts_down skeleton spread_legs spreading sweat undead undertale undertale_(series)
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2010s 2017 2boys 2d animated_skeleton bottom_sans clothed clothed_male clothing digital_media_(artwork) domimant domimant_male duo elemental_creature elemental_humanoid fellatio fire_elemental grillby hand_on_another's_head hand_on_head head_grab heart-shaped_pupils heart_eyes hisuivirus hooded_jacket hoodie humanoid irrumatio jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart male male/male male_only male_penetrated male_penetrating male_penetrating_male maledom malesub monster monster_boy oral partial_male penetration penis penis_in_mouth sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive submissive_male top_grillby topwear uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background yaoi
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