On the day my girlfriend went on a trip, I went to her house to get something I forgot, and it turned out to be her super-voluptuous older sister. When she got out of the bath, I couldn't resist the sight of her overly erotic big tits, so I forced myself to have sex with her. From then on, it seemed her sexual desire was ignited, as she gave me a titty fuck after dinner, inserted herself in the bath, and inserted herself again while we were sleeping together, and we kept getting intimate and erotic! Even so, my dick was always erect due to her divinely beautiful big tits! I kept ejaculating until she came home...