Twelfth Night Betrothal by Virginie Marconato

Born a bastard, Flynn has just inherited his father’s title. But the unexpected elevation comes at a price: he has to marry the woman the old man chose for him.

Freshly widowed, Heather is dreading her next union to a stranger, decided by her late husband in his will. Aided by a mischievous friend playing the Lord of Misrule during the Christmastide festivities, Heather devises a plan to swap her dreaded bridegroom for one more suited to her tastes.
Between magical rides in a sleigh and private boat rides on a frosted lake, it will not take her long to see that Flynn is that elusive man.
But all is not what it seems…