Cook the fettuccine in salted water to Al Dente.
In a large saute pan, add the heavy cream and the butter. Warm up the cream so that the butter melts and keep the sauce on low flame.
Add the fettuccine and toss, while you toss add the grated cheese and black pepper, as desired, and continue tossing.
If the pasta looks dry add some pasta water.
Toss for 1 minute and serve immediately.