奉仕活動で山奥の温泉宿を出資者の男と訪れた琴里。
嫌々ながら一緒に入浴することになるがずっとある部分が漲っていた男に襲われ
開放的な露天風呂でセックスをすることになってしまう。

宿は貸切、管理人には何やら交渉をして早めに帰宅してもらっているため一帯は二人きり。

遠慮も容赦もない攻めに琴里は我慢できず、山々に幼さのある艶めかしい嬌声が響き始める。
山彦でそれを聞きながら琴里と男の激しい裸の付き合いは暫く続くのだった──。

このおじさんは多分05の人…
キューピッチで塗ったのでもしかすると後で少し修正あるかもですわ

Kotori visits a hot springs inn deep in the mountains as part of her volunteer work with a male sponsor.
Reluctantly, she ends up bathing with the man, who has been throbbing with desire ever since, and he attacks her,
and they end up having sex in the open-air bath.

The inn is exclusively booked, and they've somehow managed to negotiate with the manager to let him go home early, so the two of them are alone in the area.

Kotori can't resist his ruthless and unreserved assault, and her childish, seductive cries begin to echo through the mountains.
Listening to this on the Yamabiko, Kotori and the man's intense, naked encounter continues for a while.

This man is probably from 2005...
I colored it with Cupitch, so I might make some minor edits later.