In a medium pot, boil water. Add butter until melted. Add pasta, cook until done.

Drain pasta in a colander. Set aside. 

In a second pot, larger than the one used for the pasta, heat milk to warm on medium heat. Add cooked pasta, then 8 once cheeses (use any combo cheese you like), reduce heat to simmer while stirring continuously until cheese is melted. 

Add salt and pepper to taste.