It’s an NTR hentai manga, the fmc is a milf teacher dating a student. In the cover page she’s has a red ponytail and glasses, and the douche is a delinquent who starts blackmailing her at first. In their first intercourse he provokes the mc into kissing her as a prove of their love, the teacher encourages him in her mind but he ran like bitch and then the delinquent kissed her instead and kept on having sex with her. After that she goes to the principal and demands for him to be expelled and then the principal tells her a story of how became the way he is rn and she starts to sympathize with the delinquent and when she talks to him again she notices that he doesn’t have any numbers in his phone, few days later they start to warm up to each other and start calling each other by their first names. That’s all I remember, Idk the author or the name. Plz lmk on the comments and thx in advance.