Rule 34 Dev - 1boy 2020s 2023 2d 2d_(artwork) anthro anthro_only asgore_dreemurr attempted_autofellatio balls bara beard big_penis black_and_white bodily_fluids boss_monster bovid caprine digital_media_(artwork) dilf english_text erection facial_hair fluids from_below fur furaffinity furry furry_male furry_only genital_fluids genitals hair high_res horn hyponova long_ears male male_only mammal mature mature_anthro mature_male monochrome musclegut nude open_mouth penis penis_focus precum pubes solo_anthro solo_male text third-party_source tongue tongue_out twitter undertale undertale_(series) vein veiny_penis video_game_character video_games|1025026