Tell Me Your Secrets (Geeks of Caltech #3)
Aarti V. Raman

Kit is the ultimate protector and good guy. But when his life is shattered by a damaging secret he becomes someone he doesn't recognize. Spiteful and twisted.
The only one who can get through his grumpy mood during Christmas? Single mom, Lily.
She's off-limits to him for two reasons - she is gun shy of millionaires and she is his best friend, Dev's, sister-in-law.
But Kit's brooding heart wants Lily because she drives away all the demons plaguing him.
So, he decides that the holidays are the best time to make Lily his, with her enthusiastic co-operation!
He just doesn't count on Lily's billionaire brother and his own enemies trying to end his happy ever after before it even begins.
Tell Me Your Secrets is a first-person dual POV grumpy millionaire's Christmas romance with the gun-shy sunshine of a single mom with a heart-melting happy ever after.
Tropes include grumpy sunshine, opposites attract, single mom and the bad boy, forced proximity, found family, holiday goodness, he falls first but she definitely falls harder, he tells her his deepest secret, hurt comfort and more.