khungbienhoa I am a little confused on what your goal is, exactly: you add a character with high virtue - "hard to H" by definition -, but want quick H? Or am I misunderstanding something here?
Overall, though, virtuous characters are, well, virtuous: they do not want to H in public places, and they do not H until you go on at least one date with them (definitely for Highest, not sure about High). So, rack up those Like/Love points, go on a date with her on sunday, and then start working towards H - in private spaces: toilet stall, gym/field storage shed, your/her home "for studies", etc. And, of course, make sure your efforts are NOT spent on an "incompatible" partner, say, a lesbian if PC is a guy.