https://www.pixiv.net/artworks/112541585
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_304759/
https://www.dlsite.com/maniax/work/=/product_id/RJ01108637.html
Fanza:
生徒会の姫島先輩は優しくて美人な離島出身の女の子。

ある日生徒会の仕事で先輩と2人きりの時に勃起しているところを見られてしまう。
嫌われるかと思いきや

「うちのせいなら…責任とらんばいかんけんね…」

そう言って僕のズボンを脱がし始めた。
実はエッチな事に興味津々だった先輩はスイッチが入ってしまったみたいで…？

この日から僕と先輩のエッチな秘め事が始まった…。

Base +33

[Synopsis]

A story about having a sweet sex with a senior who was actually very interested in naughty things.

Himejima-senpai, a member of the student council, is a kind and beautiful girl from a remote island.
One day, while I was working on some student council work, I was seen with an erection.
I thought she would hate me, but she said, ''If it's my fault...I will have to take responsibility...'' and started to take off my pants.
In fact, she was very curious about anything naughty and it seemed like a switch had been flipped on...
From that day on, my naughty secrets with her began...

Base +22