While acting manly in front of my girlfriend, her sister saw through my submissive tendencies and turned me into a spineless man. The first time I met her sister, she was a beautiful, mature woman oozing with allure. As I was lost in her gaze, she stealthily approached and suddenly tweaked my nipples... thoroughly. It was non-stop nipple tweaking sex, climaxing and then being driven to complete ecstasy with a male orgasm! Under circumstances where I couldn't let my girlfriend know, her sister relentlessly stimulated my nipples, making me explode in release, and I became her obedient servant.
