This is superb! Your wife finally agreed to let your best friend watch her masturbate... but she was clear there was NOT going to be any sex with him. She didn't realize how much it would turn her on, being watched like that by another man, and when he started jerking off she came almost instantly. His semen splashing on her naked flesh was like a bolt on lightning, making her orgasm even more intense.... maybe she'll reconsider your request after all... and take another man inside her...