I love my big sister! Ever since I was a child, I'd admired my cousin, Natsu.
When I returned home for summer vacation, the person waiting for me was someone truly kind, dazzlingly beautiful, and the very definition of my first love.

We ate watermelon, cooled off on the veranda, and lit sparklers in our yukata robes...
Her casual gestures and the glimpse of her sweaty skin made my heart race.

Then, one day, she saw me with an erection in the bath...
"It's all my fault, isn't it?" she asked, smiling and taking my hand...!

After that, in the bedroom, in the Japanese-style room, on the veranda...we hid from our parents and repeatedly had sweaty creampies!
Before I knew it, I couldn't leave her, either in mind or body... At the end of summer, under the sparklers, we swore to each other: "What happens this summer will remain a secret forever." An unforgettable memory of a forbidden summer that only we know about.