Responses
Is it this?
https://www.mangago.me/read-manga/shuu_ni_ichido_classmate_wo_kau_hanashi/
And this is the novel version:
https://avelilium.com/story-about-buying-my-classmate-once-a-week/
I cant remember all the details but it was based off of a novel and the title was something like "im her slave for 5000 yen" or something crazy like that if anyone knows or even has the link to the novel lmk!!