In a small bowl mix: cheese, flour, pepper.

Add heavy cream to skillet, bring to simmer over med-high heat.

Add cheese mix and wisk.

Allow cream to return to a simmer and cook for 2 minutes (stir constantly).

Season with salt as needed.

Add the cooked Fettucini to sause and toss.

Add reserve pasta water as needed until its creamy enough.

Serve with fresh grated pecorino and ground pepper.