Newbie requesting help about VPN connectivity

[mo0nlight]

I am a newbie in all matters related to Linux,
I have a proxmox server where I have installed OPNSense with internal IP 192.168.70.100 and gateway 192.168.70.1, the LAN interface DHCP 10.9.8.0/24 connected to VPN client with endpoint is vpn.example.com; VM B is debian 12 having the gateway 10.9.8.1 and the IP 10.9.8.2 connected to OPNSense as a client and having wireguard VPN server installed with listening port of 51280 and DHCP LAN 10.7.0.0/24, what should I do to let clients connected to VM B via wireguard use VM A (connected always to VPN vpn.example.com) as their endpoint.