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1:1 1:1_aspect_ratio 2018 2boys anal animated_skeleton artist_name artist_signature ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blue_glans blue_penis blue_tongue blush bottom_sans bottomless bottomless_male bound bound_wrists brother/brother brother_penetrating_brother brothers choker clothed collar doggy_position duo ectobody ectopenis ectotongue fontcest from_behind from_behind_position gay handcuffed handcuffs incest intraspecies larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwgarbagedump open_mouth orange_blush orange_body papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis restrained restraints sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on teeth tongue tongue_out top_papyrus undead undertale undertale_(series) white_background yaoi

1:1 1:1_aspect_ratio 2018 2boys anal animated_skeleton artist_name artist_signature ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blue_glans blue_penis blue_tongue blush bottom_sans bottomless bottomless_male bound bound_wrists brother/brother brother_penetrating_brother brothers choker clothed collar doggy_position duo ectobody ectopenis ectotongue fontcest from_behind from_behind_position gay handcuffed handcuffs incest intraspecies larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwgarbagedump open_mouth orange_blush orange_body papyrus_(undertale)papysans partially_clothed penetration penetration_from_behind penis restrained restraints sans_(undertale)sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on teeth tongue tongue_out top_papyrus undead undertale undertale_(series)white_background yaoi

1:1 1:1_aspect_ratio 2018 2boys anal animated_skeleton artist_name artist_signature ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blue_glans blue_penis blue_tongue blush bottom_sans bottomless bottomless_male bound bound_wrists brother/brother brother_penetrating_brother brothers choker clothed collar doggy_position duo ectobody ectopenis ectotongue fontcest from_behind from_behind_position gay handcuffed handcuffs incest intraspecies larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwgarbagedump open_mouth orange_blush orange_body papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis restrained restraints sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on teeth tongue tongue_out top_papyrus undead undertale undertale_(series) white_background yaoi

1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed cum_on_face cum_on_self cuntboy disembodied_hand ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) looking_down monster monster_boy object_insertion partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tongue tongue_out uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy

1cuntboy 2020s 2022 2d animated_skeleton blue_blush blue_cum blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bound_ankles bound_arms bound_legs bound_wrists clothed crying cum cuntboy disembodied_hand drooling ectoplasm ectopussy egg_vibrator hand hooded_jacket hoodie jacket logo_(pixiv_id_30462562) monster monster_boy object_insertion one_eye_closed orgasm partially_clothed partially_nude restrained restraints sans sans_(undertale) sex_toy sex_toy_insertion shackles skeleton solo_focus submissive sweat tears uke_sans undead undertale undertale_(series) vibrating_dildo vibrator vibrator_in_pussy