Yeah I asked that same thing myself couple of days ago, there really is no proper walkthrough.
Basically what you need to do, and all you really can do, is interact with the NPCs everyday during different times of day using different dialogs to unlock different progressions with them, you know, the love and corruption options (during dates etc). And also remember to do the quests, although there isn't many of those. It's pretty straightforward really, all you need to be careful of is to not let relationship points go too low if you want to avoid NTR, that's just about it, other than that just do everything.