Rule 34 Dev - 1boy 2d 4_fingers anthro anthro_male anthro_only asriel_dreemurr backpack balls belly boss_monster brown_eyes building caprine erection exposed eyebrows fur furry furry_male furry_only grass horn house humanoid humanoid_male humanoid_only kokoha_is_here long_ears looking_aside male male_only mammal mammal_humanoid navel nude open_door outside penis pocket pubes shadow smile solo teenager trail undertale undertale_(series) video_games walking white_balls white_fur young|2993957696