(男が女になら)He falls in love with her―loses his heart to her―takes a fancy to her―(女が男になら)―She fixes her affections on him.
(男が女に)to love―fall in love with―a girl―(女が男に)―fix her affections on a man
the state of something being of one's will
to have a lingering desire for the past―regret the past
to have one's will of a woman