Maybe ... IF you have access to government-level computers/software. Otherwise, every IP address is unique. And depending on your ISP, your IP address may change every time you login.
Hey so I'm never going to do this and I know its illegal but is it possible to change your ip adress to the same as your friends??
No it is not possible to have same IP for both users. Because every system is allocated with its own IP. So, there is no possibility of it.