Is your wife resting next to you, or in the next room where you could easily be walked in on and caught jerking for me? Good, then jerk. You need to stroke your cock for me and you're not going to let the fact she's nearby get in the way. Obeying me even when it's a bit dangerous for you not only excites you, it proves that you're willing to take risks for me. You'll gladly take this risk to please me and to jerk at your eager dick.