Nicely executed scenes (AI or not), cute girls, but both of them so thoroughly unlikable pretty much from the start that it takes the fun out of it for me. Most of these games force their narrative in one way or another, but the complete lack of any meaningful choices in combination with the basically non-existent pacing makes this title more rage-inducing than enjoyable. Oh, and the "cuck diary" feels foisted on and patronizing. Will probably not continue with this one.
Take a look at NTR Mobile, which handles all of these points (sans the diary) *much* better and adds to the voyeuristic element with some nice little gadgets.