Rule 34 Dev - ... 2023 2boys 2d ? animated_skeleton ass black_pants blue_hoodie blue_jacket book bottom_sans brother/brother brothers clothed clothing digital_media_ duo fontcest gloves holding_book holding_object hooded_jacket hoodie humanoid implied_incest jacket looking_at_crotch looking_down male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy pants papyrus_(undertale) papysans penis red_gloves sans_(undertale) shirt_lift shirt_up siblings skeleton spoken_ellipsis sweat top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi|1033132

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