Rule 34 Dev - 2022 2boys 2d animated_skeleton bottom_sans brother/brother brothers clothed digital_media duo ectopenis english_text eye_penetration fontcest gay humanoid incest intraspecies male male/male male_only male_out_of_frame monster monster_boy onomatopoeia papyrus_(undertale) papysans partial_male penis penis_in_eye profanity sans_(undertale) sex sibling_incest siblings simple_background skeleton sketch skull_fucking solo_focus swearing text tired_but_horny_(artist) tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face veiny_penis video_game_character video_games white_background yaoi|1021287

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