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2020s 2023 2boys 2d 2d_(artwork) all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing) boxers_around_one_leg brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

2020s 2023 2boys 2d 2d_(artwork)all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing)boxers_around_one_leg brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork)duo fontcest from_behind_position hat headwear hooded_jacket hoodie implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus papyrus_(undertale)papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans sans_(undertale)seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi twitter uke_sans undead undertale undertale_(series)video_game_character video_games yaoi

2020s 2023 2boys 2d 2d_(artwork) all_fours animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_background blanket blue_blush blush blush_lines bottom_sans boxers_(clothing) boxers_around_one_leg brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background digital_media_(artwork) duo fontcest from_behind_position hat headwear hooded_jacket hoodie implied_bottomless implied_penetration implied_sex inactive_account incest interlocked_fingers intertwined_fingers intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monster monster_boy nightcap on_bed one_eye_closed orange_blush pajamas papyrus papyrus_(undertale) papysans polka_dot_clothing polka_dot_hat polka_dot_pajamas sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom striped_bottomwear striped_boxers text top_papyrus topwear toubigaizi twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

2020s 2023 2boys 2d 2d_(artwork) anger_vein animated_skeleton bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male black_and_white blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers cape clothed clothing digital_media_(artwork) duo fontcest grabbing_hand hand_grab hooded_jacket hoodie imminent_sex inactive_account incest jacket kissing larger_male male male/male male_only monochrome monster monster_boy multiple_views pants_around_legs papyrus papyrus_(undertale) papysans pinned_down sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus toubigaizi twitter uke_sans undead undertale undertale_(series) valentine's_day video_game_character video_games white_background yaoi

1:1 1:1_aspect_ratio 2020s 2023 2boys animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans brother brother/brother brother_and_brother brothers clothed clothed/nude clothing duo fontcest grabbing_leg incest intraspecies kissing kissing_crotch larger_male leg_grab male male/male male_only monochrome monster monster_boy naked nude papyrus papyrus_(undertale) papysans purplebluepen45 sans sans_(undertale) seme_papyrus sibling_incest siblings size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text top_papyrus traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_games yaoi youfoundta