BEDDED -- BY MISTAKE!

The things she had to do to save her family business! That night Emily Quest had dressed to the nines -- in a tight slinky dress, killer heels -- and had gone to an awful champagne-drenched party with Auckland's elite -- where she'd been rescued by a handsome stranger with laser blue eyes.

Despite the sizzling, heart-stopping attraction between them, Emily had thought she'd never see him again. But now, years later, he's right in front of her, as sexy as ever....

From what he's seen of her, Ethan West thinks she's a liar, a tart, a rapacious gold-digger, and he's about to make her face the consequences -- in his bed!

Not sure what the above description refers to,, i guess the first scene, but
Accidental Mistress by Susan Napier
This is the one where
She is a pottery art restorer
Gets caught swapping a poorly done commission
Her house/business gets burned down
Living with rich old man who thinks she is his granddaughter... she is not
Hero is old man's nephew

(Hero has brother )
Can't remeber if he gets his own book