Wiktionary
love interest
n. 1 One who is of interest as a potential partner in love 2 A romantic plot or subplot in a film or book 3 Any of the characters involved in such a plot
Usage examples of "love interest".
Basically, my only knowledge of high-powered magic came from trideo dramas, in which mages can toss killer spells all day and still have the energy to jam their love interest all night.
It was full of human interest and love interest and it fairly scintillated with dramatic highlights.
Since Emma was the mature love interest, Taylor had, much to her relief, cut a subplot involving two young lovers.
But people have complained [about] how little love interest there is in my stories.