Ah, what a wingman the lecturer was by cancelling all of a sudden.
Also, I like how this started as a misunderstanding, or rather...Her jumping to conclusions when all he actually wanted was to see her illustrations and she ended up flashing him. Then she gets so flustered that she strips him and Hentai takes it course. Interesting.
Great ending though. Well, hey, I'm sure she'll be relying on him a lot more from now on...