PKPD-351 Amateur Fling Documentary: College Girl Mayu Goes All Out with Her Senior Coworker, Unprotected

Let me introduce my casual partner. Mayu-chan, who is two years younger than me and my junior by four years, became close with me after I introduced her to a part-time job at a café. I found out she liked intimacy after we went out for drinks, and I thought she might have many casual partners, but it seems she really dislikes being intimate with people she doesn’t get along with, so she comes to see only me almost every week. At this point, could a promotion to boyfriend be possible?