Rule 34 Dev - arms_behind_back balls beard black_hair bondage boots bottomless brown_hair earrings erection femdom goggles happy_trance helmet lab_coat lip_biting long_hair mad_scientist malesub necklace nipple_piercing nude penis piercing progress_indicator pubic_hair short_hair sitting sleepy-foot tech_control topless unfocused_eyes wall_eyed|207478