Yeah... Nanjou (Pickup-pai) wasn't really an obstacle, not at least since that last exchange outside of the school as Anna dragged Kyo away. He was already well aware of how they felt about each other at that point, pretty sure, and all his actions since then (possibly even since New Year's, especially the way the anime rendered that exchange) may well have been prodding to get Anna to admit it, since his efforts have generally been focused on her. Especially considering he made a point to try and stop Kyo from blurting it out when they were talking as Anna came up in the aforementioned scene.
Not that we really need to see it, but I do kinda hope Mamiya (Nanjou's female childhood friend that's always following him around) finally gets what she clearly wants from Nanjou, a serious relationship. The guy's proven he's not actually a piece of shit, and was even pushing our main pair to make progress, in his own way.
Also... yeah... what the hell did they do in those few seconds that involved Anna's ribbon being taken off? Considering how they've generally been, I doubt it was anything particularly physical, since I know they won't do anything significant like a kiss out of view. Maybe another tradition was upheld, like the second button thing? Is there something having to do with a girl giving her ribbon away? Even though they're not graduating, it could have been a significant enough act to take, given the event.
I already know their first kiss certainly isn't for a bit, and I know that the very first thing Anna does after giving her reply to Kyo's confession was the first peck on the cheek she's given him, according to the anime, so it's not like they'd be doing a make-out session at this stage when they're not even ready to have that cheek peck kiss in private until months after this...
Well, they're not quite ichi eyes- they're swirly eyes... Ichikawa has distinct circles within circles, not a swirl pattern.