https://www.dlsite.com/maniax/work/=/product_id/RJ392197.html

It was a secret relationship between just the two of them during summer vacation. When I was still a child, I had a close relationship with a female relative like sibling,
but when I moved to Tokyo, we naturally became estranged.
One day, when I decided to go back home for summer vacation for the first time in several years, I received a message from her for the first time in a long time.
“I want you to teach me about sex.”
Along with that message was a selfie erotic photo.
That exchange marked the beginning of our secret summer vacation.

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