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1_eye anus artificial_intelligence balls big_breasts blank_humanoid blush breasts duo erection eyelashes faceless_character faceless_male female genitals glados half-closed_eyes human humanoid humanoid_genitalia humanoid_penis larger_female machine male mammal masturbation mouthless narrowed_eyes nipples not_furry nude penile penile_masturbation penis pochincoff portal_(series)robot robot_humanoid size_difference smaller_male valve valve_corporation vulva y_anus yellow_eyes