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2010s 2018 2boys 2d anal animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans completely_nude completely_nude_male dark_background digital_media_(artwork) duo elemental_creature fire_elemental from_front_position gay grillby grillsans heart-shaped_pupils heart_eyes indoors larger_male larger_penetrating larger_penetrating_smaller legs_over_partner's_shoulders legs_over_shoulders legs_up male male/male male_only male_penetrating mellednsfw missionary_position monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) yaoi

2010s 2018 2boys 2d animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans dark_background digital_media_(artwork) duo elemental_creature elemental_humanoid fire_elemental gay grillby grillsans heart-shaped_pupils heart_eyes hugging humanoid indoors larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mellednsfw monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex sitting sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) yaoi

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