https://www.dlsite.com/maniax/work/=/product_id/RJ01074812.html
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[Synopsis]

The area where I live is more rural than the city.
There are a fair few shops near the station but just a few kilometers away is filled with rice fields.
That's why young people leave for the city when they become adults.
The countryside simply doesn't have much entertainment...
Kaede said she wanted to go somewhere to have fun during summer vacation, so we drove into the mountains, where we boldly began engaging in sexual acts that we normally wouldn't.
Kaede resisted at first but perhaps because she felt safe in the middle of nowhere and our actions gradually escalated!
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Part 1 Synopsis for context:

Kaede was a regular customer at the flower shop and would often buy flowers from her childhood.
When Kaede grew up, she confessed her feelings to Tatsuya, which led to them starting a relationship.
Kaede became worried that Tatsuya would be popular with other women just because he was a florist, so she decided to help out at Tatsuya's flower shop as a part-timer.
The two then began doing naughty things while working in the shop, trying not to get caught...

Part 1 (DLSite): https://www.dlsite.com/maniax/work/=/product_id/RJ401000.html

[Characters]

Tatsuya:
The eldest son of the flower shop owner.
He is caring but because of this he was not popular in school and was not very noticeable in his class.

Kaede:
A regular customer who lives nearby Tatsuya's shop.
She would often come here to buy flowers on errands for him since she was little.
She called Tatsuya ''big brother.''

Base +28, Dnkz +60