Forever by Ivy Nelson is the ninth book in her Diamond Doms series. I highly, HIGHLY recommend starting this series from book 1 as it will definitely enhance your enjoyment. You really need the character and storyline backgrounds that build and expand with each book in the series. Oh and the books while they are a great read, they are not for the faint hearted. Lots of tension, drama and steamy scenes will keep you hooked for sure.
Russell the stern, stoic protector who happens to be a sadist turns out to be the perfect fit for beautiful and sometimes bratty Gemma. Of course as with all stubborn men he resists at first but the temptation and need builds to a point where he can no longer hold back. With so much going on around them and so much danger constantly threatening them and their friends, they definitely need to stick together and try hard to work out the best way out of danger for all involve.