Explanation

Wow so many people got confused! Hi there! I'm the translator for this dj! So let me just...
Viktor is pretending to be an alpha even though he's an omega.
Yuuri is pretending to be a beta even though he's an alpha.
Yuuri pretending to be a beta because he thought Viktor is an alpha. In this society, alphaxalpha is not acceptable hence why Yuuri pretends to be beta.
Yes, there's the continuation for this series but I don't have them. If anyone can provide me with fhe raws, I'll be more than happy to translate it.
No, there will be no switch. Yuuri will keep on bottoming through the whole series. The author only draws ViktorxYuuri stuff after all.
I'm not really sure about the pipe dream part. It might be referring to the "blaming Yuuri" since Viktor would never do that. As I said, this series is still ongoing. I just don't have the rest of the series.
When Yuuri first met Viktor, he thought he was Viktor's fated mate. At that time, Viktor already claimed himself as alpha (even though he's an omega) and Yuuri not presented yet.
After Yuuri presented as alpha, he thought he was mistaken about being Viktor's fated pair because fated pair only works for alpha x omega.