End With A Bang by Sirena Wise

Fiercely principled newlywed Ivy is on a mission to bridge the rift between her husband and his father, arrogant billionaire Sever Mark. But when she arrives at his mansion unannounced, he confuses her for a scheduled playmate—and before she can say “Stop, I’m your daughter-in-law,” major boundaries are crossed.

Now, he wants her for himself, and he won’t be satisfied until she’s willingly in his bed. Ivy is far from willing: she loves her husband, she’s not a cheater, and she hates everything Sever stands for.
Trouble is, their chemistry is volcanic. She’s strong enough to resist temptation, but as she sees beneath his heartless exterior, her resolve begins to crack. An intense, fiery affair erupts, and while Sever is boldly smitten, Ivy wraps herself in layers of denial. That is, until shocking family secrets come to light, and she’s left to suspect that Sever—and her husband—may not be what they seem.