It had to be expected...let’s say that the author wants to go for at least 230 chapters, if the confession was now, how it could fill the remaining parts of his work?
Fanservice with a (plain) story is accettable, only fanservice probably not.
The only thing that is a little out of place is that it’s Megumi to chicken out, while I was expecting to be Maa-kun. (Well, he does it, but at the same time It had to be expected from him since his feelings for Amano are still unclear for himself too.)
Oh, and Tarzador is right