Who said you need to have an Xbox to play Xbox games? All you need is a gaming PC or laptop, a Windows 10, and a decent internet connection. And BAM!! You can load most Xbox 360 games on your system without spending a penny on your game console.
As of now, since Microsoft has merged their consoles and PC software, games are only accessible with Windows 10 (sorry Mac users). So from Forza, Fable Fortune to Halo 4, this is how you can play Xbox 360 Emulator games on your PC.