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2020s 2022 2boys anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers duo ectopenis ectoplasm fontcest footwear gloves hooded_jacket hoodie humanoid incest intraspecies jacket larger_male larger_penetrating laying_on_side lying_on_side male male/male male_only male_penetrating monster monster_boy motion_lines on_side papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis penis_size_difference red_boots red_gloves red_penis s2ames2 sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background size_difference skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks thrusting top_papyrus trembling uke_sans undead undertale undertale_(series) white_background white_socks yaoi

2020s 2022 2boys anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers duo ectopenis ectoplasm fontcest footwear gloves hooded_jacket hoodie humanoid incest intraspecies jacket larger_male larger_penetrating laying_on_side lying_on_side male male/male male_only male_penetrating monster monster_boy motion_lines on_side papyrus papyrus_(undertale)papysans partially_clothed partially_clothed_male penetration penis penis_size_difference red_boots red_gloves red_penis s2ames2 sans sans_(undertale)seme_papyrus sex sex_from_behind sibling_incest siblings simple_background size_difference skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks thrusting top_papyrus trembling uke_sans undead undertale undertale_(series)white_background white_socks yaoi

2020s 2022 2boys anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers duo ectopenis ectoplasm fontcest footwear gloves hooded_jacket hoodie humanoid incest intraspecies jacket larger_male larger_penetrating laying_on_side lying_on_side male male/male male_only male_penetrating monster monster_boy motion_lines on_side papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis penis_size_difference red_boots red_gloves red_penis s2ames2 sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background size_difference skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks thrusting top_papyrus trembling uke_sans undead undertale undertale_(series) white_background white_socks yaoi

2022 2boys 2d animated_skeleton artist_name beetleevil blue_blush blush blushing_male boots bottom_sans bottomless bottomless_male brother/brother brothers clothed clothed_male clothing crown digital_media drooling duo ectotongue egg_vibrator evilbeetle fontcest grabbing_from_behind grabbing_leg grey_background happy headwear heart-shaped_pupils heart_eyes hooded_jacket hoodie humanoid incest intraspecies jacket leg_lift legs_apart male male/male male_only monochrome monster monster_boy mouth_open onomatopoeia open_mouth orange_blush papyrus_(undertale) papysans partially_clothed partially_colored sacrum_lacing sans_(undertale) sex_toy shirt_up sibling_incest siblings simple_background skeleton socks soul teeth toned tongue top_papyrus trembling trembling_legs undead undertale undertale_(series) vibrator yaoi

2022 2boys 2d animated_skeleton beetleevil blue_blush blue_hoodie blue_jacket blush blushing_male bottom_sans brother/brother brothers clothed clothed_male clothing digital_media duo ectoplasm ectotongue evilbeetle fontcest gloves grabbing_arm grey_background heart-shaped_pupils heart_eyes hooded_jacket hoodie incest intraspecies jacket licking male male/male male_only monster monster_boy orange_blush orange_tongue papyrus_(undertale) papysans red_gloves red_scarf sans_(undertale) scarf seme_papyrus sibling_incest siblings simple_background skeleton soul soul_sex tears tears_of_pleasure teeth top_papyrus trembling uke_sans undead undertale undertale_(series) upper_body visible_breath yaoi