Rule 34 Dev - 1boy 1girl beck chiba_tsunemi copyright_name crossover facial_hair greyscale highres holding holding_microphone instrument inward_v k-on! kotobuki_tsumugi long_hair microphone monochrome music mustache panties_(pantsu-pirate) playing_instrument playing_piano rapping synthesizer teeth upper_teeth_only v-shaped_eyebrows|21858890157