Every man is more or less ashamed of masturbation, whether his partner disapproves it or even if you do it together sometimes. It is additionally very private and intimate.
In this game you use his favourite masturbation procedure, but you're doing it for him and he is not allowed to do anything.
Step 1: Ask your man to choose his favourite guided porn or he can find one on this page (JOI porn - Jerk Off Instructions)
Step 2: Let him prepare a extensive masturbation session, with all his favourite toys and enough lube.
Step 3: The game rules follow on the next pages...