I really enjoy the training school sequences, as well. I liked Witch Trainer quite a bit, and I typically like sub-games, so having a WT adaptation as a sub-game in VWA suits me just fine.
I agree that it's odd to have Astrid being so wanton in the school, and then reverting to more modest behavior outside, but I'm willing to suspend my disbelief due to my enjoyment of the sequences.
I have mixed feelings about the fact that the later (and more corrupt) tasks, such as the blowjobs, have much less attention paid in terms of number of renders and text. On the one hand, I do agree that it would have been nice if there were more content in those scenes. On the other hand, I like the way that we join the scenes in the middle of the action. The first time Don watched Astrid giving a blowjob, there was a little bit of a sudden shock when I suddenly "walked in" on Astrid mid-blowjob. I quite liked that. But I agree that it would be nice to see how she approached it, what the male student's response was, how he treated her throughout the encounter, and what his attitude toward her was afterward. My solution, if it were up to me, would be to have the scenes play out as they do in the current build, but have a longer version of the scene play as a flashback during a "debriefing" session, when Don asks her about the task.