Switchgrass might be a temporaryoption. I would put a row or two of red cedars, tightly spaced, either behind or in front of the pines. It will take 3 or so years of growth for the trees to make a blind, if you have good dirt. Putting a hog wire fence up and planting honeysuckle on it would be a fast solution, and the deer love the honeysuckle. The honeysuckle vines have atendency to pull a fence down over time is the only problem.