[kujoe]

Just continue reading. Nothing has been laid in stone yet, so no one can really give you a definite answer to your questions.

But if you want to know based on what's been happening so far...

Spoiler:

does Nagi fall in love with Aya?

-- Not sure.

and Does Aya still love him?

-- So far? Yes.

And she doesnt do anything with Masataka?

-- Maybe she will, maybe she won't.