Kuroi Hitsuji summary:

from fictiondb:"So the black sheep has returned to the fold."Willa Ross knew she wasn't welcome in her hometown of Cascade, Wyoming. Especially not by Clay Cantrell--who still held her responsible for the accident that caused the death of his sister five years before.But when her aunt took ill, and desperately needed her to look after the failing family ranch, Willa couldn't say no--not to the woman who'd raised her.Willa's presence stirred up painful memories for Clay. So she'd vowed to keep out of his way. Yet they were drawn to each other--this time not as love-struck teenagers, but as man and woman... .