Only Him by Lila Younger

Audrey always plays by the rules. She has ever since a devastating illness nearly killed her. But when Gage, her brother’s best friend, saves her, she falls for him hard. Nobody else comes close to perfection.
There’s only him.
After a whole lifetime of doing what she should, Audrey’s afraid to try, no matter how right it feels.
But Gage won’t take no for an answer.
And once she belongs to him, there’s no way in hell he’s giving her up. Not even if it costs him everything.