Study buddy

Study buddies, you either hate them or love them, right?!
I've been lucky with almost every single one I've ever had. They knew how to motivate me, when to work hard and when a little goofing off was in place.
But every now and then you run into someone, where you seriously question if they have your best at heart or even their best.
You know the kind of study buddy, who seems to always get in the way of you doing any real work...

Did you need this?

And the kind that somehow get you to do all the hard work for them...

You write, I nap, okay?! 

Oh well, I guess I had it coming, I have after all known this one for almost 16 years and it is always the same...