To being with, cheese sauces usually have a milk base outside the cheese. Just reducing the amount of cheese added to the base would create a sauce that's thinner and less rich.

Of course, there are many other kinds of sauces that can be added to pasta. Some already use milk or cream as their base. I would stay that you should experiment yourself, but...

[Her eyes lift away from Lucina, in the direction of the kitchen. It's not...the best conditions to try making new foods for yourself.]