My super big-breasted and kind sister let me practice sex with her multiple times because I was a virgin and feeling down. No matter how many times I failed, she responded kindly. Then, getting carried away, I went for five consecutive non-stop in-and-outs without pulling out, and to my surprise, she came over and over! She lost all composure and became completely submissive. No matter how many times I came, I'd get hard again right away... My sister, now fully switched on, this time did non-stop endless in-and-outs without pulling out until I couldn't get hard anymore! We both ended up with our legs giving out! Now I'm one of the guys!
