While I was on my way to my girlfriend's house, I met a beautiful girl. Since she couldn't catch a taxi, she asked me to take her home. But I didn't expect that she was the older sister of my girlfriend who had just returned to the country!!! After I took her to her place, she wanted to thank me in an international way. Not knowing what it was, I agreed, but I didn't expect that her way of thanking me was... through sex!!! I was seduced by her; she had an incredibly 'open' personality and allowed me to not use a condom, which are things my girlfriend would never allow...