Arafed boy holding a cake with lit candles in front of him

I want you to take a photo of a young man's arm with a small birthday cake in the background of his room.. But I want the photo to be from the position or perspective that only the arm is seen and not the person.. But with the cake a little bigger so that at least it covers your hand. and. Let the person come out, only his arm. I don't want the person to appear in the photo, sino only his arm