Any dark hero/evil male interest x main girl?
Extra hotness points if he's a fantasy/supernatural being.

Laura thalassa: the fallen world series & bargainer series
Emma Winters: supernova series
Maria v. Snyder: study series
jeaniene frost: night prince series

From "villain gets the girl" list on gr :)

[Dendra]

These Old Shades by Georgette Heyer. Regency Romance.

The Skull series by Penelope Sky
Tormentor Mine series by Anna Zaires
The Anti-Heroes Collection by Meghan March
Transfusion Saga by Stephanie Hudson
The Four Horsemen series by Laura Thalassa.