Rule 34 Dev - 1boy 2017 all_fours ass balls bent_over bowser collar english_text feet hair horn koopa looking_at_viewer looking_back male male_only mario_(series) monochrome nintendo nude open_mouth presenting presenting_hindquarters raised_tail rear_view scalie simple_background sketch slightly_chubby smile solo spiked_collar spikes tail teeth testicles text thetauren video_games white_background|2884331176