Here's how it works: tahini, with its slightly nutty, rich, savory flavor, makes a great base for some oozy vegan cheese, and unlike some other vegan cheese bases, it's already blended up for you and ready to go.
It's up to you how thick you want it to be - keep in mind that you will probably want it to be oozy versus gloppy, and it will thicken slightly more as it cools.