This fit all the criteria for a Do Not Read
Almost all characters committed Adultry, Long seperation, implied age gap
BUT
Joss Wood turned a DNR into a 4☆ read. (very impressive)

Official blurb:
She wants a family…but first she has to leave her convenient husband! Joss Wood captivates in this marriage-reunion romance.
His business-deal bride… is negotiating for an heir!
Millie Piper’s on-paper marriage to CEO Benedikt Jónsson gave her ownership over her life and her billion-dollar inheritance. Now Millie wants a baby, so it’s only right that she ask Ben for a divorce first. But she doesn’t expect to be completely blindsided by her attraction to her convenient husband!
For lone-wolf Ben, Millie’s in-person request ignites a dangerous desire. The intimacy of having his wife in his luxury Iceland home already threatens his ruthless self-control, though nothing compares to the shock of Millie’s next proposal—that Ben father her child!