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2010s 2017 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_hoodie blue_jacket blue_tongue blush bottom_sans bottomless crying crying_with_eyes_open digital_media_(artwork) duo ectoplasm elemental_creature elemental_humanoid fire_elemental gigandam glasses grey_background grillby grillsans hooded_jacket hoodie humanoid larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy one_eye_closed orange_body pants penetration pixiv_id_780096 rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex shirt_up sitting size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tongue tongue_out top_grillby topless topless_male two-tone_background uke_sans undead undertale undertale_(series) video_games

2010s 2017 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_hoodie blue_jacket blue_tongue blush bottom_sans bottomless crying crying_with_eyes_open digital_media_(artwork)duo ectoplasm elemental_creature elemental_humanoid fire_elemental gigandam glasses grey_background grillby grillsans hooded_jacket hoodie humanoid larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy one_eye_closed orange_body pants penetration pixiv_id_780096 rectangular_eyewear rectangular_glasses sans sans_(undertale)seme_grillby sex shirt_up sitting size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tongue tongue_out top_grillby topless topless_male two-tone_background uke_sans undead undertale undertale_(series)video_games

2010s 2017 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_hoodie blue_jacket blue_tongue blush bottom_sans bottomless crying crying_with_eyes_open digital_media_(artwork) duo ectoplasm elemental_creature elemental_humanoid fire_elemental gigandam glasses grey_background grillby grillsans hooded_jacket hoodie humanoid larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy one_eye_closed orange_body pants penetration pixiv_id_780096 rectangular_eyewear rectangular_glasses sans sans_(undertale) seme_grillby sex shirt_up sitting size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tongue tongue_out top_grillby topless topless_male two-tone_background uke_sans undead undertale undertale_(series) video_games