He's a little annoying at times, and yea he is chaining down my favorite girl just like Golthin mentioned, but I feel real sorry for him. Because when the shit hits the fan, it is really gonna hit the fan for Nobuse.
Can't rule out the possibility that Nobuse might actually become endearing to Aiko at some point. I'm torn hard on this one because I would love to see Aiko and Shin match up, but I also like to adhere to the bros before hos mentality. Men know, you have to respect your boys' boundaries and it hurts to encroach on those boundaries. If it doesn't hurt, you're not really a good friend I would think.
Shin is going to get caught in a shitstorm that he has no idea is coming(as of now). Aiko will flat out tell Nobuse at some point, or he might finally pick up on the body language and figure it out on his own. Aiko doesn't strike me as the girl who will go for the surprise kiss but hey, I'm not ruling that out either. I'm looking forward to what will happen then.