Bishoujo Yuutousei ga Ochiru Made~Hentai Rijichou no Kyouhaku Choukyou~ [final] by Soft Circle Courreges

One day, in the middle of those busy but happy days, Asahi is summoned to the career counseling office by her club advisor.
The advisor praises her grades and her record with the club — then points out that she has been working at a restaurant, which the academy forbids.
In truth it is only helping with the family business at her parent’s shop, and given the household’s finances it is something the school could approve. The advisor, though, makes a show of it: she is on scholarship, the club’s ace, and the next club president, so the responsibility is grave — the club will have to be disbanded, or suspended indefinitely.
In tears, Asahi begs: she will take any punishment. She will quit the job. She will do whatever she is told. Please just forgive her.
The advisor says only, “You won’t go back on those words, will you? As long as you don’t disobey me, that’s enough.” Asahi nods, still teary-eyed.
And then the advisor makes an unexpected demand of her.