Well, this is going to either turn out awesome or awful, it seems.
Definitely a cliffhanger, but how will it resolve?
The main problem I see is that we know so little about Iori. The author has tried to make this a story from Seto's perspective alone. The way she acts, strongly seems to indicate that she likes him. It seems like it'll be really difficult for the author to say now that she doesn't like him.
Seto could wimp out, and not kiss, or even confess, which would be infuriating.
Someone could show up at just the right moment and interrupt... I really hope there isn't a crappy end to this...