https://www.dlsite.com/maniax/work/=/product_id/RJ01365442
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_457880/

[Synopsis]

Hayasaka Emi, the school's most exemplary and strict discipline committee member, is suddenly called by a janitor with whom she has no contact and is shown a video of her and her boyfriend having sex in the gym storeroom.
If the school finds out about this, won't she and her boyfriend, who are about to graduate, be expelled?
When she begs the janitor, who looks serious, to let it go, he asks for her body in return.
She tries to negotiate with him but the most she can manage is to not kiss him... and she ends up being embraced by him, enduring her physiological aversion.
At first she feels disgusted but as he continues to push her around persistently, she repeatedly reaches orgasmic heights of pleasure that she has never experienced with her lover...

Base +28, Fofotron +26, nuts987 +13