grumbling mode on
The author talks a lot about tits, but rarely shows them creatively or erotically (except for additions from Twitter). All the chapters use the same pattern, with almost nothing new happening. The series has become boring to read.
I think the "not friends, not lovers" was a mistake, as it drags out the plot development, but the author has no outstanding ideas on how to fill the void he has created. It was better, in my opinion, to let the main characters be lovers and explore the mature theme of dating.