<human>: Can you summarize the given text in a few sentences?

Both of us have been disgruntled for the past couple of years so this really was inevitable.  However, it is quite ironic that it is happening at the exact same time for both of us.  Basically, we are the only two people in our department, so there will be no one to cover the job once we are gone.

The funny thing is that our boss pretty much deserves this since he has screwed us both over on various occasions.  But like I said I am not trying to make this end badly.

How should be approach this scenario?  I've thought about the old tag team method but I don't think that gives the right impression.  Another fun bonus is this is that I was going to quit a few months ago and they counter offered me, but I didn't get the raise and was told it was denied by upper management.
<bot>: co-worker and I need to put in our 2 weeks tomorrow and I am curious to as how we should go about this to not make it look planned or anything like that.