Yours, Eventually

Sage Calloway has heard Graham Mercer say "eventually" for six years.
Eventually you'll find someone your own age. Eventually your brother's going to notice the way you look at me. Eventually this — whatever this is — has to stop.
He's never once said never. That's the part she can't forgive him for.
Graham is thirty-eight. Her brother's best friend since basic training. The most careful man in Harlow Creek, Vermont — and the only one who's never once tried to talk himself out of wanting her, only ever tried to talk himself out of having her. He's been waiting for a version of "the right time" that never comes, telling himself patience is the same thing as doing right by her.
Then her brother deploys for six months, hands Graham the keys to the lake house and one instruction — keep an eye on her — and "eventually" runs out of road.
Now Graham is out of excuses and out of distance. Every night in the same house as the one woman he's spent years being careful about is a slow negotiation with his own restraint — and Sage has stopped being patient with a man who keeps promising her a someday he won't commit to a date for.
She's done waiting to be chosen on his schedule.
He's about to learn that a man who makes a woman wait long enough eventually has to prove he was worth it.
Tropes: Secret Crush, Brother's Best Friend, Age-Gap, Slow Burn, Forced Proximity, Possessive Alpha