Okay here's the walkthrough.. this is only to get melissa's maxed points only up untill her sex scene from 1.1..
so the choices are only when you talk to melissa or talk about melissa with someone that can affect her points directly..
there's also choices with other characters that could open different conversation to add melissa's points..
Note:
it doesn't matter if you being a jerk towards david or not in other conversation.. and this probably not complete because a lot of connection between other characters so the playthrough might be a little bit different if you chase other girls (for example michelle, because they hate each other). this walkthrough based from my playthrough where i chase melissa mainly without thinking about other girls..
I hope i made it detailed for you.. enjoy..