I think you’d get more pleasure from a Fleshlight than a flashlight but if a spot light on him while you use your hand works for you, then a torch seems a good option.
Apologies, just pulling your leg. This thread from 10 days ago, Fleshlight, has quite a bit of input from forum members on Fleshlights and the guys favourites and why. If you do a search for Fleshlight, you’ll also come up with dozens of other threads on the forum that you might find helpful in decision making.