Xbox and PS have a game sharing feature.
Anything bought digitally, be it your xbox live membership or a game, counts twice. One for you, and one for your friend.
My friend and I take turns buying the games we like digitally and always play them together across two xbox's.
Our library of games is ridiculous.
In order to do it (on xbox anyway), go into settings and change your 'home xbox' to your friends account. Set your friends 'home xbox' to your account, and boom, you've done it. These accounts never need to sign in or anything, I only play on my account but I get access to everything either one of us have bought.
How long has this been a thing?! I'm a PS user and never seen this advertised









