The Birthday Agreement
(2026)(The second book in the Mom Club Confidential series)
A novel by Nikki Leigh
It started as a joke.
On Brielle Monroe’s thirty-first birthday, somewhere between tequila shots and late-night honesty, she says the one thing she probably shouldn’t:
‘What if one man isn’t enough for me?’
She expects her husband Jason to laugh.
Instead… he listens.
Jason has always loved Brielle exactly as she is—bold, outspoken, impossible to ignore. But their marriage has settled into something predictable, safe, and a little too quiet.
So when Brielle’s birthday fantasy turns into a very real proposition, Jason makes a decision that will change everything:
For one weekend, there will be no rules except honesty.
There’s just one complication.
The man they choose is Leo Carson—the younger brother of Brielle’s ex. The boy who used to babysit her kid. The man who left town years ago and has returned very much not a boy anymore.
Leo has always watched Brielle like she’s fire.
Now he’s being invited closer.
What begins as a reckless birthday agreement quickly becomes something none of them expected—an intoxicating mix of jealousy, desire, trust, and the dangerous question of how far love can stretch before it breaks.
The Birthday Agreement is a steamy contemporary romance about marriage, temptation, and discovering that sometimes the most dangerous thing you can do is tell the truth about what you want.
Perfect for readers who love:
On Brielle Monroe’s thirty-first birthday, somewhere between tequila shots and late-night honesty, she says the one thing she probably shouldn’t:
‘What if one man isn’t enough for me?’
She expects her husband Jason to laugh.
Instead… he listens.
Jason has always loved Brielle exactly as she is—bold, outspoken, impossible to ignore. But their marriage has settled into something predictable, safe, and a little too quiet.
So when Brielle’s birthday fantasy turns into a very real proposition, Jason makes a decision that will change everything:
For one weekend, there will be no rules except honesty.
There’s just one complication.
The man they choose is Leo Carson—the younger brother of Brielle’s ex. The boy who used to babysit her kid. The man who left town years ago and has returned very much not a boy anymore.
Leo has always watched Brielle like she’s fire.
Now he’s being invited closer.
What begins as a reckless birthday agreement quickly becomes something none of them expected—an intoxicating mix of jealousy, desire, trust, and the dangerous question of how far love can stretch before it breaks.
The Birthday Agreement is a steamy contemporary romance about marriage, temptation, and discovering that sometimes the most dangerous thing you can do is tell the truth about what you want.
Perfect for readers who love:
- married couples exploring desire together
forbidden tension and complicated attraction
jealousy, emotional stakes, and high heat
protective husbands and dangerously charming third men
romance that is bold, addictive, and impossible to put down
A standalone romance in the Mom Club Confidential series.
Used availability for Nikki Leigh's The Birthday Agreement