Opening Pandora's Box 5 - How Can You Do This To Me?

I used to write as xleglover and Flash of Stocking.

This 5 book series is about a happily married couple who has added another man to their relationship, to spice up their sex life. What happens when a husband and wife go down this path? Is the ending inevitable?
Ollie (the husband) and Jessie (the wife) know it's risky and dangerous to include Roman in their lives. He's ruggedly handsome, has a great body, and knows his way around a girl's body. Jessie and Roman are friends, so there's already an emotional attachment even before their relationship becomes intimate.
Through Ollie's encouragement, Jessie takes that step with Roman, and has sex with him. Or maybe it's jumping off a cliff, because things go fast and get complicated after that.
For Jessie, it's a chance for her to explore her sexual fantasies with Roman. He does things to her that Ollie can't. He reaches places Ollie can't. And, Jessie thrills to the NRE excitement of a new romantic relationship. As time goes on, Jessie's connection to Roman becomes as much emotional as physical.
Ollie loves the delicious cuckold angst as his wife's relationship with her lover grows. Masochistically, he loves seeing Roman take his wife to places he cannot.
But Ollie begins feeling bitter and scared as, more and more, Jessie picks Roman over him. She does things for Roman she's never done for him, even though he's asked. She's changed her appearance for Roman. She wears his ring when they're together, instead of her wedding ring. Jessie even makes Ollie wear condoms before her dates with Roman, as Roman wants her body to be fresh.
Can Ollie and Jessie's marriage survive the addition of Roman? Especially when it becomes clear that Roman is in love with Jessie and wants her all to himself?