One of my gay friends had his left hand amputated and decided to go for a stainless steel hook on the prosthetic arm. Actually it looks very erotic seeing him wearing a jacket and a hook protruding from the sleeve, he has started to give me JO's using the hook which can close to a small circle of steel, it is very exciting and usually ends with me and his hook and prosthetic arm end covered in cum, which I clean off for him.