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2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia

2d 2d_(artwork)ahegao animal animated_skeleton annoying_dog_(undertale)beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork)dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale)papysans reverse_suspended_congress sans sans_(undertale)seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series)unseen_male_face video_games white_background yaoi zoophilia

2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia

2020s 2022 2boys 2d 2d_(artwork) abosinsin anal anal_penetration anal_sex animated_skeleton arms_grab bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_legwear blue_hoodie blue_penis blush bodily_fluids bottom_sans bouncing_penis brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed cussing dialogue digital_media_(artwork) dirty_talk duo ectopenis english_text erect_while_penetrated fluids fontcest from_behind_position fully_clothed gloves grabbing_from_behind head_out_of_frame holding_arms hoodie inactive_account incest intraspecies kneeling larger_dom larger_male larger_penetrating larger_penetrating_smaller leaking_cum legwear male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male maledom moan moaning monster monster_boy motion_lines onomatopoeia papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes penis penis_through_clothing pounding prison_guard_position profanity red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smooth_penis swearing sweat text text_bubble thought_bubble thrusting top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi

1:1 1:1_aspect_ratio 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton bad_id bad_twitter_id blush bottom_sans brother brother/brother brother_and_brother brothers digital_media_(artwork) duo english_text fontcest from_behind grabbing_hand grabbing_hands hand_on_hand hands_grab imminent_sex implied_sex inactive_account incest intraspecies male male/male male_only monochrome monster monster_boy papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sweat sweating text thought_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi