A friend of mine made a profile on my console and I have PlayStation Plus...I just want to know if they go home and log on to their console will they be getting my Playstation Plus sub because they have a profile on mine also? Or is PlayStation Plus only for the console you buy it for?
No, they can't access your account or membership from their console unless you log into their console.
PlayStation Plus is only applied to a console when an account that has a subscription is logged onto the console. In order for all accounts on the console to benefit from the PlayStation Plus membership, the account with the subscription must activate that console as their Primary PS4. Here is the online manual page for activating a Primary PS4.