Amazon description: "Now that Jesse has found a perfect partner in Grant, the new Dom in his life, he figures there's just one thing that will make their relationship ideal. And her name is Stephanie. He's not at all surprised when Grant's on board with his plan. Now they just have to convince Stephanie to take a chance on them."
Additional details: "Perfect Addition" (£3) is technically volume three in a series, but it can be read on its own without having read the earlier two instalments.