In a large pot of salted boiling water, add the orzo and cook to 1 minute less than package instructions. Strain orzo and set aside leaving orzo in strainer.
In the same pot you cooked the pasta in , over low heat, melt the butter. Add the heavy cream and bring it to a simmer. Add the salt and pepper. Simmer on low about 2-3 minutes to thicken slightly. Stir in Parmesan cheese to fully incorporate. Taste the cream sauce to see if needs more salt. Stir in the orzo pasta and simmer on low about 1 minute. Remove from heat and gently fold in the feta cheese keeping the crumbles intact.
Serve immediately, topped with more grated parmesan.