Two itunes accounts on one laptop
You should each have your own user account/login on the computer then you can have each use your own iTunes, iCloud, email, Facebook, Twitter, etc… accounts.

You can create an user account on your computer by going to 


System Preferences > Users &amp; Groups, 
Unlock that panel if necessary (Click on the lock in the lower left corner and enter you password if the lock icon shows as locked) 
Then press the "+" icon in the table above the unlocked icon to add another account to your computer.