guess I'm wanting to know if a paranormal plot is expected along with the romantic one at the same time?
If I understand you correctly . . .
I don't think one needs a 'paranormal plot.'
It's like . . . does a Historical Romance have a 'History plot'?
Not so much.
Historical Romance has historical characters with plausible historical motivation. The Romance plot is appropriate to the historical setting. And the historical elements are part of the story, infusing everything.
Sometimes the plot
is 'who killed the princes in the tower? Let's find out.' Sometimes the plot is, 'what if a merchant fell in love with a noble's daughter in 1506' and we never mention larger events at all.
The paranormal fictive world -ISTM - can be part of the story as a major plot element. Lessa and F'lar must revive the wyrs to save Pern.
Or the paranormal fictive world can mostly be the playground for the story. I'm reading
The Mislaid Magician by Wrede. The paranormal elements don't run the plot, any more than the Napoleonic Wars run the plot in P&P.