Party for Three by Missy Lyons
Sherry is not aging gracefully, but when her friend Alan wants to throw her an over the hill party she can't back out without looking petty and silly. So she goes unwillingly.
Sean has been waiting for an opportunity to show Sherry he is more than another young cocky kid. He doesn't care about age, she might be twenty years older than him but she is still sexy as hell in a little black dress.
Fate throws a monkey wrench in his carefully laid plans when his best friend seduces her first forcing him to make this a party for three.