bdsm bondage bound cybertronian decepticon digital_drawing_(artwork) digital_media_(artwork) erection frown genitals hasbro humanoid humanoid_genitalia humanoid_penis kneeling koch43 living_machine machine male not_furry overlord_(transformer) penis penis_bondage raised_arm red_eyes restraints robot rope rope_bondage simple_background solo submissive submissive_male takara_tomy transformers