Set yourself up as the primary user for that console and it should be fine. He will be able to use your ps plus on that console only.
[settings] > Select [PSN] > [Activate as Your Primary PS4] > [Activate].
Was thinking on our last game of the season we could get some sort of twitch streaming going on, so everyone can get involved and have the fixtures happen one after another, make it a bit of event. Just a thought.