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[–] ElementalPee 0 points 2 points (+2|-0) ago  (edited ago)

If he's signed on to his profile on your PS4, then yeah you could access the games but only from that profile. If he activated your ps4 as his primary ps4 though, then any profile on that system could play the games. But his own ps4 would no longer be set as his primary and that could have some effects.

So the way I see it is you guys have two choices. Either play the games while signed into each others' profiles, or you both activate the other person's ps4 as your primary ps4 (you can do that somewhere in the ps4 settings.)

Edit: Just to be clear, the user that a game belongs to will always have access to that game no matter what ps4 they are playing from, whether or not it is their primary ps4. Setting it as the primary ps4 is what allows other profiles on that system to have access to that user's games.