How could she sleep?(1)

All the characters depicted in this story are over 18 years of age.

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"How could she sleep?" I wondered, as I watched my sister sleep like a stone from across our extremely hot room. It was so unbearably hot, I had stripped down to just my underwear, and was laying on top of my covers, feeling rather envious of my younger sister, who was obviously oblivious to the heat.

I took another sip of water that was by my bed, but even that was warm and giving no relief.

So instead, I poured some of what was left over my head, providing temporary relief, but not for long. Then, I don't know why, but I started throwing some water at my sister, enjoying her sleepy reactions. Finally, after she was thoroughly soaked, she woke up, and she wasn't happy. "What the hell are you doing?...Cut it o……