This is Not a Holiday Romance by Camilla Isley

Two sworn enemies, snowed in over Christmas with chemistry that will melt the ice!
Nina Thompson has one Christmas wish: to avoid her brother's obnoxiously handsome best friend, Tristan, like the plague. From the moment he humiliated her as a teenager to their escalating revenge schemes, Nina and Tristan's relationship can only be defined as an all-out prank war! And there is yet to be a winner.

But it just so happens the ghost of Christmas present has other ideas. When Tristan unexpectedly crashes her family's Christmas, Nina's dreams of a peaceful holiday vanish faster than Santa up a chimney. Determined to end their rivalry for good, she braces herself for one last prank-filled showdown.

But when they find themselves snowed in, with no way of avoiding each other amongst the holiday festivities, they discover their heated exchanges have been masking a different kind of sizzle. Caught in a snow globe of holiday romance, they decide to let their fiery chemistry burn bright—but this is absolutely and unequivocally nothing more than a secret fling destined to melt with the snow, this is not a forever romance...