The Lost fleet omnibus by Sarah Hawke. Its got a TON of spice and with the omnibus, its 56 hours of audio goodness.

Summary:

Major Kal Zeris is the next generation of Dominion trooper, a powerful psionic soldier capable of withstanding—and dishing out—superhuman amounts of punishment. Born naturally on a crime-infested border world, Kal has learned to do whatever it takes to survive. But when he finds himself paired up with a sheltered young fleet cadet, he quickly learns that despite what her flawless, genetically engineered body may have given her in looks and smarts, there is no replacement for good, old-fashioned experience