Virtual variant products with quantity in product association

hey guys, I got a question concerning virtual-variant products.

Szenario:

We have a virtual product with 2 product variants associated with it. each
variant contains 2 items (to the customer we say he gets a double pack).

so normally I would say: I change the quantity within the product
association to two items.

BUT: Now I have two different supplier for this variant product. The one
sells a single pack, so I have to buy 2 to satisfy my customer, The other
one directly sells the double pack, so I just have to buy one.

Now I dont know how to setup this product.

Also I am wondering: When I change the product association quantity to > 1,
than the selling price does not change, is that correct? Because I thought I
need two items, so the selling price should be double.

for any help I am happy :)

Thanks