1)
What is "Nafti"?
1.
Rashi: I blew the scent, like one who waves a scarf in a fragrance house to bring the scent from above to below.
2.
Rashi citing Dunash: It is burning; there is nothing like this [in Tanach].
2)
Why did she say "Mishkavi"?
1.
Malbim: She increases audacity to say that he will lie on the same bed that she lies on. "Ravadti Arsi" (16) implies [that he will lie on] her bed, but perhaps she will lie elsewhere.