In front of my girlfriend, I acted like a man and a sadist, but my girlfriend's sister saw through my masochistic side and seduced me to the core. When I met my girlfriend's sister for the first time, she was a beautiful, mature woman with a sexy personality. I was mesmerized, but she suddenly started playing with my nipples... and she did it thoroughly. Even after I ejaculated during sex while she was constantly playing with my nipples, I was completely ascended to heaven with a follow-up male squirt! In a situation where I couldn't let my girlfriend know, she focused on stimulating my nipples and made my dick explode, and I became her servant.