Rating: All Ages
Author's Summary: Spoilers for 'Last of the Time Lords.'
Characters/Pairings: Ten, Rose implied.
It's Dark Doctor! - sorta.
Again, this fic reminds me of the personality characteristics we saw in The Waters of Mars. Specifically the quote "There's nobody left to tell him it's wrong."
This takes place after The Last Of The Time Lords. The Doctor is clearly damaged by what happened with The Master, and there is no one there, to quote Donna, to stop him.
In this, he uses the Masters technology to go and change something that happened in his past. He takes Rose from himself.
I think this shows what could have happened had Donna not shown up. The Doctor would have fallen into insanity a lot sooner then he did. Dave7 really does a good job showcasing the thought patterns that bring The Doctor to this point. You can see very vividly how he changes from the Timelord we all love, to someone who will bed the rules of time to his own advantages.
It's really scary, when you think about it. Just another perspective on The Doctors thoughts. There is a part two as well which is actually Ten/Rose, which you can find on Teaspoon.