I had fun with this chapter yet I'm disappointed.
You would imagine that by this time, after Ooya dry hump her or that she wrote down her name followed by his lastname that they would have a little bit of a different reaction to this sort of scene. I mean, something like this early on in the manga? sure, totally but now it feels like we are going back in time.
Right now, i would have expected they would be moving towards "Hey, I... I really like you" sort of thing and then they would move to the secret relationship sort of thing to avoid awkwardness with their friends (even though all their friends know what is going on).
Instead it seems we have gone to: Author introduces a character that wants to stimulate the romcom mood and the main characters won't do a single thing day after day.
Based on his reaction I can see there is some character development, becoming more secure and what not, with her... it seems she is becoming more a unidimensional character.