Networking between VirtualBox Virtual Machines

There are now two VirtualBox virtual machines, a network via Nat with a host. One virtual machine needs to take the Internet from the host and transfer the Internet to the second virtual machine. So that the second machine did not have communication with the host, but it was access to the network. And on the first machine, you could run a PC or run traffic through a proxy.

I'll go to Wirth's second. The car needs to go online. I want to take the Internet from the first Wirth. Cars. It will be a proxy or a proxy (that would be possible to use a proxy, but in priority VPN). And Wirth's first. The machine goes from a home laptop, through a wireless router.