Hooked by the BBC 3: Shady Business in Bloomington, MN

Sam and Mike have drifted a long way from the BBC cuckolding agreement in Book 1, but that doesn't stop Sam from exploring her newfound pleasures...
Simultaneously, Mike is finally forced to reveal some dark truths, and Sam must make some significant sacrifices (or are they really sacrifices?) to negotiate for his protection. But will that be enough to buy their freedom?