DECEPTION, book THREE of FIVE in Aleatha Romig's INFIDELITY series.
"Infidelity - it isn't what you think"

It all began in Del Mar, a chance meeting with a single rule--one week only.

Or did it?

Lennox ‘Nox’ Demetri and Alexandria ‘Charli’ Collins had every intention of following their agreement but rules are made to be broken. In CUNNING they are reunited with Nox setting down new rules for the game and Charli having no choice but to follow them.