My Lord by Tracie Podger

When Lord Duchoveny was presented with an opportunity that was hard to resist, it came with a clause. A woman he desired would also, technically, be his boss.

Gabriella Collingsworth oversaw the UK operations for a private investor and venture capitalist. Between them, they had agreed Alex Duchoveny would be the best man to head a new business with lucrative contracts.
What hadn’t been banked on was the immediate attraction between Alex and Gabriella and the push and pull of forming a relationship between two people with alpha tendencies.
A British stiff upper lip or stick up his ass as Gabriella called it, causes Alex to find it difficult to express his feelings for her.

That is until an old rival returns for revenge.