My Best Friend’s Billionaire Brother by Anne Martin

Weston Myles has as many scandals to his name as zeroes in his bank account.
Our sizzling office romance should’ve stayed in the past where it belongs.
Especially since we kept our relationship a secret from his sister–my best friend.
But it’s been two years, and now my bestie is getting married.
She’s handpicked us to be the best man and maid of honor.
There’s no avoiding the sculpted billionaire grump when he shows up.
This arrogant alpha is my opposite in every way, but we share a common enemy.
So when that person threatens him with an ultimatum, I agree to Weston’s proposition.
Our fake marriage arrangement is temporary, but the friction between us is heating up.
And now, the congratulations from my doctor has me wondering if we can be more.