But why would you want the characters to be more human? I can understand complains about 'hentai logic' cause we have a certain level of suspension of disbelief, but the characters being more human is not always a good thing, i mean... humans are kinda jerk-ish...
Confession -> Going out -> Marriage -> Sex? That doesn't sound bad at all, could be a good Vanilla story.
Still, her asking her Sensei whom I imagine she can trust is a lot better than her just asking any random guy.
Also...Heh, Condoms? Come now, in Hentai, there really is no need for it. Worst case, you got a kid and he just has to take responsibility.