We've Only Just Begun (Oregon Trail Dreamin' #1)
Kathleen Ball

Along the trail, once again, Susan is forced to marry another man in name only and this time it is Mike Todd. As soon as they make it to Oregon they plan to have the marriage annulled but their hearts become hopelessly entangled.
Mike Todd has two brothers to raise. They are guides on the wagon train and he decided long ago he’d raise them and forget about having a wife and child of his own. Little does he know that he’d find a forever type of love.
Both vow to sacrifice their hearts’ desire to give the other happiness. Will they come to realize their lives and love have only just begun?