Taking her boyfriend home, the younger sister was robbed of her boyfriend by her older sister

She played for about two days. My girlfriend is extremely cute, beautiful, and I love her very much. The only thing I don't like is that she always makes me wear a condom when we have sex. Today, while preparing for "battle," her sister suddenly came home drunk.

So we stopped to take her to bed. Unable to sleep, I went out to get some water, and suddenly she came close to me, mistaking me for her lover, and started flirting with me. And our clandestine relationship began from there...