VIP to VIP traffic on different BIGIP's

See below setup:

Client --> VIP1(Big-IP 1) --|ASA|-->VIP2(Big-IP 2)-->Pool-->Server

1. Configure VIP1 on Big-IP 1
2. Create a Pool with VIP2 as pool member on Big-IP 1.
3. Assign above pool to VIP1 on Big-IP 1.
4. Create VIP2 on Big-IP 2.
5. Create Pool with your servers on Big-IP2.
6. Assign above pool to VIP2. This is fairly simple setup.

    

   Note: Make sure your ASA allows access from Big-IP 1 to VIP2 on Big-IP 2.

Hope this helps!