[HUNTA-579] With my swimsuit sister in the bath!! Before I knew it, my sister, who had grown up, couldn't help but get an erection! I thought I had no interest in my childish sister at home, but one day, my sister broke into the bath! She came wearing a swimsuit and said she wanted to wash my back! She never says such things normally... Apparently, she's friends...

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My sister suddenly entered the bathroom wearing a swimsuit, saying she wanted to wash my back. She seemed to be trying to get a new summer swimsuit, but whether intentionally or by accident, she kept pressing against me while washing. Though I usually think of her as childish, her appearance in the swimsuit made me feel flustered. I tried to stay calm, but my body reacted involuntarily. My sister noticed and kept glancing over, eventually reaching out...